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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Identification and Physical Mechanical Property Comparison between Completely Decomposed Granite and Granite Residual Soil ZHOU Xiao-wen, LUO Xing-cai Journal of Yangtze River Scientific Research Institute    2022, 39 (4): 1-7.   DOI: 10.11988/ckyyb.20211331 Abstract （2082）      PDF（pc） （1853KB）（2301）       Knowledge map    Save Completely decomposed granite (CDG) and granite residual soil (GRS) are prone to trigger engineering accidents and geological disasters in South China. Despite that the weathering degree and engineering properties of CDG and GRS both vary remarkably, it is still a challenging task to distinguish CDG and GRS in practical geological investigation, in which the field geological appearance and the measured hit number of standard penetration test according to existing specification are taken as the major indicators for identification. In this paper, we discussed the relevant clauses about identifying CDG and GRS in some current specifications. In view of the difference in gradation between of CDG and GRS, i.e., the former is usually clayey sand, while the latter sand clay, we suggest to take grading characteristic as the subsidiary index of identifying CDG and GRS.According to physical properties test and triaxial shear test of soil samples from a foundation pit, we found that GRS sample had a larger pore ratio with a poor gradation lack of some intermediate particle sizes. Both the undisturbed CDG and GRS present initial structural features reflected by shear zone with strain localization in shear deformation, displaying drum-shear zone failure mode; the remolded samples present a standard drum-like failure mode. The friction angle of drainage shear of undisturbed CDG is slightly higher than that of GRS, and the cohesion obviously higher as CDG boasts a stronger structure; the cohesion of remolded CDG and remolded GRS are close due to the lack of original structure. Under low confining pressure, the structural strength of undisturbed soils contribute up to 60%-70% of the total shear strength, and the compression action of high confining pressure can completely destroy the initial structure of soils, in which case the structural strength will be eliminated. Reference | Related Articles | Metrics | Comments（0） Select Inquiry into test method for measuring heat conductivity coefficient of polyethylene plastic pipe material XIAO Han-Jiang, DAI Chun-Fang, CUI Jian-Hua JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2001, 18 (5): 46-47.   Abstract （1685）      PDF（pc） （121KB）（1386）       Knowledge map    Save According to the principle of heat balance,a formula for finding the heat conductivity coffieient of material used for circular pipe is derived.Through the analyses and experimental study of affecting factors in the formula and simulating water flow state in the pipe,a simple and applicable testing method for measuring the heat conductivity coefficient of polyethylene plastic pipe is proposed,and an illustrative computation is given Related Articles | Metrics | Comments（0） Select The Synthesis of Cross-Linking Agent of CW520 Acrylate Grouting Material and the Properties of Its Slurry ZHANG Jian, WEI Tao, HAN Wei, WANG Zai-Qin JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2012, 29 (2): 55-59.   Abstract （1644）      PDF（pc） （1024KB）（3464）       Knowledge map    Save The method of synthesizing a non-toxic and water-soluble cross-linker is introduced. This novel cross-linker could replace the ordinary cross-linking agent N’-Methylenebisacrylamide, a material neither easily dissolved nor environmental-friendly, which is commonly used in acrylate grouting. The ingredients of CW520 acrylate chemical grouting material synthesized by this new cross-linker have been determined. Tests on the mechanical properties of slurries and gels indicate that CW520 acrylate grouting material is featured by low viscosity, good fluidity, low osmotic coefficient, and can be injected into tiny cracks with controllable gelling time and high compressive strength of consolidated sand. It’s of great practical value and could be utilized widely. Related Articles | Metrics | Comments（0） Select Key Issues in the Joint Operation of Large Cascade Reservoirs in Yangtze River Basin XU Ji-Jun, CHEN Jin, YIN Zheng-Jie, et al JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (12): 48-52.   Abstract （1606）      PDF（pc） （2075KB）（2931）       Knowledge map    Save The joint operation of large-scale cascade reservoirs in the Yangtze River basin will not only strengthen the flood control capability, but also bring great integrated benefit to water resources utilization and hydropower output due to their  tremendous storage capacity and hydropower installed capacity. The key  issues in the development, running and management of joint operation system are proposed. According to researches performed in recent years, research achievements and progresses with respect to the developing strategy, the multi-objective optimization model, the ecological operation, the management system and coordination mechanism, and the system simulation technology for the joint operation of large-scale cascade reservoirs are presented. Related Articles | Metrics | Comments（0） Select THE MOST STRINGENT WATER RESOURCES MANAGEMENT Chen-Jin JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (12): 1-4.   Abstract （1600）      PDF（pc） （1024KB）（1531）       Knowledge map    Save The growing urgent need for water allocation and water use control is made clear by frequent droughts  in parts of Yangtze River Basin in the last decade and the adoption of stringent water management system. The principle, method and management approach of water allocation are discussed on the basis of the characteristics of this basin and the problems in water allocation. It’s found that the water allocation and control of total water use in dry years or dry periods should be focused, and the control of water flow process should be emphasized. Water use efficiency and management targets in water function regions should be taken into account in the control of total water use. Meanwhile, the management of water transfer projects and large reservoirs must be considered. Related Articles | Metrics | Comments（0） Select Study on the Changes of Historical Flood and Drought Series in Haihe River Basin LU Lu, LIU Jia-Hong, QIN Da-Yong, WANG Hao, YU Ying-Dong JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (11): 14-18.   Abstract （1580）      PDF（pc） （1356KB）（2074）       Knowledge map    Save The simulation analysis on floods and droughts and research on their influences are hot topics in the study on regularity of climate events. The calculation of flood and drought periods and the detection of sudden changes are important approaches in exploring the regularity. Based on the historical data of flood-drought grades in the past 540 years, the flood and drought periods and the sudden changes are calculated by means of power spectrum, wavelet analysis, index analysis and Mann-Kendall method. The results showed that the floods and droughts of Haihe river basin took predominance for 10, 23, 37, and 75 years in the history with a transformation from drought to flood in the 17th to the 18th century. Reference | Related Articles | Metrics | Comments（0） Select Quantitative Model for Dam Safety Assessment ZHANG Ji, LIN Shui-sheng, RAO Xi-bao JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2013, 30 (2): 12-15.   DOI: 10.3969/j.issn.1001-5485.2013.02.003 Abstract （1555）      PDF（pc） （904KB）（2624）       Knowledge map    Save The key to assess dam safety is to qualitatively evaluate each individual indicator. We determine the specific quantitative evaluation values of the dam safety level, and then define the model parameters of the dam safety level by non-linear fitting mathematical analysis tool (Matlab). Thereby, on the basis of Logistic model, we can get a precise quantitative evaluation model, which accurately fits the quantitative evaluation parameters with the determination coefficient of 0.998 6. In this way, the qualitative evaluation of individual indicators is transformed into quantitative evaluation.  Related Articles | Metrics | Comments（0） Select Technique of Additional Mass Method for Rockfill Density Measurement and Evaluation of Its Application ZHANG Jian-Qing, ZHOU Zheng-Quan, CAI Jia-Xing, MA Sheng-Min, MA Qi JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2012, 29 (8): 45-51.   DOI: 10.3969/j.issn.1001-5485.2012.08.009 Abstract （1537）      PDF（pc） （1416KB）（2282）       Knowledge map    Save  The additional mass method was applied to detect rockfill density quickly and accurately, and to control the quality of dam filling in-time. Key technologies in the application of additional mass method are elaborated in this paper, including the obtaining of rockfill density through correlation method, the data collection and  processing system, the quality control evaluation system, and the 3-D digitalization. Remote control on the construction quality and digital measurement of the rockfill density were realized by using GPRS to build the data network link between local and remote network. The method was applied to Nuozhadu hydropower station, and good results were achieved. Related Articles | Metrics | Comments（0） Select Ecological Compensation Mechanism in Chishui River Basin HUANG Wei, MA Yun-Jie JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (12): 27-31.   Abstract （1469）      PDF（pc） （1232KB）（1602）       Knowledge map    Save To rationalize the ecological relation and benefit-based relation between upstream and downstream areas, and to boost a sustainable development of the whole river basin, it's proposed to establish a rational ecological compensation mechanism and to compensate the upstream areas by the nation and the downstream areas. Based on the analysis of ecological values and main problems in Chishui River basin, the principles of ecological compensation are put forward, and an initial framework for compensation mechanism is proposed. Approaches and methods of eco-compensation and the supporting measures are also presented. Related Articles | Metrics | Comments（0） Select In-situ Stress in the River Valley of Dam Site of Sanhekou Hydro-Junction ZHAO Xian-min, YIN Jian-min, LI Yong-song, ZHOU Chun-hua JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2013, 30 (2): 31-34.   DOI: 10.3969/j.issn.1001-5485.2013.02.007 Abstract （1452）      PDF（pc） （1121KB）（1941）       Knowledge map    Save Sanhekou Hydro-junction project is located in the river valley of east Qinling area. Complex geological structure and topography determines the complexity of in-situ stress distribution. To investigate the distribution of in-situ stress, hydraulic fracturing test was carried out on 3 boreholes in the slopes of both abutments and the river bed. Measured results show that the stress values are relatively large in buried depth of 0-50m in borehole at the river bed, and elevation of 500-530m in the boreholes at both banks, which can be designated as increased stress zone. Meanwhile, the area of buried depth under 50m in the borehole of river bed and elevation under 500m in the boreholes of both banks can be designated as original stress zone. In the shallow rockmass under the riverbed, the orientation of maximum horizontal principal stress is nearly perpendicular to the river trend, and with the increase of burial depth, it is close to the direction of regional structure. In the surface rockmass of slope, the direction of maximum horizontal principal stress intersects with the river trend at an small angle, and with the increase of burial depth, it transits to the northeast gradually. In deep buried rock mass, the direction of maximum horizontal principal stress is close to the regional tectonic.   Related Articles | Metrics | Comments（0） Select Channel Evolution and Regulation of Zhenjiang-Yangzhou Reach of the Lower Yangtze River LIU Xiao-Bin, LIN Mu-Song, LI Zhen-Qing JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (11): 1-9.   Abstract （1419）      PDF（pc） （1157KB）（2029）       Knowledge map    Save The Zhenjiang-Yangzhou reach (hereafter referred to as Z-Y reach) is one of the river sections with the most severe changes in lower Yangtze River. The evolution of this reach is complicated and the river regulation involves great difficulty. Changes of the river in the past century are described as follows: the head of Shiye sandbar collapsed continually and the left branch developed slowly with the mainstream moving towards the right after the confluence. The concave bank of Liuyu bend, which developed towards the downstream afterwards, collapsed constantly since the concave bank and convex bank exchanged. The multi-braided channel at Hechang island developed into a goose-head shaped double-braided channel, and afterwards the main channel exchanged with the branch channel while the left branch developed steadily. The effects of regulation works in this reach is analyzed, and regulation ideas are proposed for the existing problems. Reference | Related Articles | Metrics | Comments（0） Select Implementation and Verification of Unsaturated Seepage Analysis in FLAC3D ZHOU Yue-feng, THAM L G, YAN W M, FAN Shao-peng JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2013, 30 (2): 57-61.   DOI: 10.3969/j.issn.1001-5485.2013.02.012 Abstract （1415）      PDF（pc） （1532KB）（2929）       Knowledge map    Save The seepage model in FLAC3D was extended using its in-built programming language FISH. The SWCC (Soil Water Characteristic Curve) for seepage in unsaturated loess was best-fitted using MATLAB. The obtained parameters were written as a subroutine and invoked in each step in the seepage model of FLAC3D to simulate the unsaturated loess. One-dimensional infiltration problem in three boundary conditions was modeled using both the finite difference method and the finite element method to verify the extension in FLAC3D. The comparison results show that the above method is appropriate. The findings of this paper are meaningful in the investigation of the unsaturated soil theory and in the application of FLAC3D to simulate unsaturated soil problems.  Related Articles | Metrics | Comments（0） Select Target of Controlling Total Amount of Water Use from Main Stream and Tributary of Yangtze River ZENG Xiang, DONG Ling-Yan, LUO Jian-Yu JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (12): 19-22.   Abstract （1405）      PDF（pc） （1450KB）（1580）       Knowledge map    Save This research is made in accordance with the No.1 Central Document Policy and the most stringent water resources management planning issued by the Ministry of Water Resources. The status quo and planning of water use in the main stream and tributary of Yangtze river basin and provincial administrative regions are investigated on the basis of national water resources comprehensive planning and the hydrological regime in the basin. The targets of controlling the water use total amount for the whole basin are divided and implemented in each provincial administrative region and the main tributaries, and are ultimately allocated to each specific control section. The research result could serve as quantification technological support and decision-making basis for organizations in the basin to carry out the No.1 Central Document Policy and to establish the most stringent water resources management system combining total amount control with quota management. Related Articles | Metrics | Comments（0） Select The Water Purification Ability of Plants on Floating Bed and Its Influencing Factors ZHANG Jin, HUANG Wei, SANG Lian-Hai JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (12): 39-42.   Abstract （1404）      PDF（pc） （1184KB）（1845）       Knowledge map    Save The water purification ability of 12 plants commonly used on floating island are compared, and factors that influence the ability are summarized. The results reveal that red leave beet (Beta vulgaris var cicla) has the highest total nitrogen removal rate amounting to 85.72%, while water spinach (Ipomoea aquatica) keeps the highest total phosphorus removal rate of 95.6%, and water spinach (Ipomoea aquatica) and Canna (Canna indica) both are able to remove nearly all the ammonia nitrogen  in the water. Moreover, the water body and the season should be considered when selecting plants on the floating bed, and a 30% floating bed coverage could help achieve the best effect. The results could provide theoretical basis for applying biological floating island to water ecological restoration. Related Articles | Metrics | Comments（0） Select Evaluation Index Quantification for "The Three Red Lines" of Water Resources Management in Wuhan SUN Ke-Ke, CHEN Jin JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (12): 5-9.   Abstract （1403）      PDF（pc） （1182KB）（2495）       Knowledge map    Save "The Three Red Lines", as the core of the most stringent water resources management policy, consists of  the red line of  restricting water resources exploitation and utilization, red line of  controlling water consumption efficiency, and red line of  limiting water resources pollution. The implementation of each red line requires a corresponding evaluation index, which needs to be quantified as there exists disparity in different areas and industries. The article first makes an analysis on the relationship among the three red lines, and makes a quantification of each evaluation index with Wuhan Municipality as a case study. The quantification results could offer  reference for the formulation of reasonable evaluation index for Wuhan’s water resources management. Related Articles | Metrics | Comments（0） Select River Health Assessment  Method Based on Different Spatial Scales Wang Bo, LIANG Jie-Peng JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (12): 32-35.   Abstract （1370）      PDF（pc） （1120KB）（1907）       Knowledge map    Save The main methods of river health assessment in China and abroad are  reviewed, and the stages of its development are summarized. The spatial scales are classified in line with the requirements of river health assessment, and the spatial and temporal correlation of the  river ecosystem is established. Moreover, according to the classified spatial scales, the spatial adaptation of various methods are discussed and methods suitable for large, medium and small-scale evaluation are recommended. Related Articles | Metrics | Comments（0） Select A Multi-attribute Risk Decision-Making Method Based on Relative Dominance for Reservoir Flood Control Operation QIN Hui, LI Qing-Qing, ZHOU Jian-Zhong JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2011, 28 (12): 58-63.   Abstract （1369）      PDF（pc） （1111KB）（1685）       Knowledge map    Save A quantitative analysis on the risk of reservoir flood control operation under hydrological uncertainty was made using  Monte-Carlo simulation method. Based on the analysis results, target values of flood control schemes were approximately described as random variables in a finite interval obeying normal distribution. To solve this multi-attribute decision-making problem with normal random variables, a multi-attribute risk decision-making method based on relative dominance was proposed in this paper. This method was applied to the risk analysis and scheme sorting and selection of Three Gorges Reservoir flood control operation. The results obtained demonstrated its effectiveness and indicated that it could provide decision support for the flood control scheme of Three Gorges Reservoir. Related Articles | Metrics | Comments（0） Select The Approximate Formula for Normal Water Depth of Semi-Cubic Parabolic Channels TENG Kai JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2012, 29 (12): 30-33.   DOI: 10.3969/j.issn.1001-5485.2012.12.007 Abstract （1369）      PDF（pc） （970KB）（2110）       Knowledge map    Save The current calculation of the normal water depth of semi-cubic parabola-shaped channel  has such shortcomings as complex process and inadequate precision. Through transforming the basic equation of normal water depth and by introducing the dimensionless water depth and the characteristic parameter, we present an approximate formula which is obtained through successive approximation and fitting equation of normal water depth, with the minimum standard residual difference as the objective function. The formula is simple, convenient, applicable and practical. Error analysis and calculation example show that the maximum relative error is only 0.261%, which meets the requirements of engineering accuracy. This research provides a more effective approach of calculating the normal depth of semi-cubic parabolic channel. Related Articles | Metrics | Comments（0） Select A Shared Software Service System: Hydraulic Cloud Computing Platform XU Wen-jie, WANG Zhong-jing Journal of Yangtze River Scientific Research Institute    2021, 38 (9): 141-148.   DOI: 10.11988/ckyyb.20200674 Abstract （1368）      PDF（pc） （6793KB）（950）       Knowledge map    Save As Internet + technologies develop, informatization, mobile office, and resources sharing have become the trends of various industries. In hydraulic engineering, geotechnical engineering, and engineering geology fields, most calculations are based on desktop software, which lacks standardized management and qualified teamwork performance, resulting in the waste of resources. Based on cloud computing technology, we made a detailed exploration from the technical aspects of algorithms, 2D and 3D visualization and interface interaction and hence developed a Web-oriented hydraulic cloud computing platform—THC. The cross-platform cloud computing and cloud visual, cloud approval, cloud sharing and etc. of the calculations can be completed using THC. The applications of THC's four major modules, namely, statistical analysis of rock mass, geotechnical test, slope stability analysis, and flood routing, demonstrate that THC provides reliable and convenient computing services for users. Meanwhile, as the first cloud computing platform with good interaction in the field of hydraulic and civil engineering, THC also offers sound computing services for teachers, students, enterprises and researchers, and is of great significance to promoting the standardization and information management of data. Reference | Related Articles | Metrics | Comments（0） Select Comparison of Water Production and Utilization in the North and South of China CHENG Meng-meng, CHEN Jin JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI    2012, 29 (11): 1-4.   DOI: 10.3969/j.issn.1001-5485.2012.11.001 Abstract （1363）      PDF（pc） （1120KB）（1716）       Knowledge map    Save Water resources has been a key issue in the national economic development and people’s living. The serious situation China’s water resources is facing now requires that our country has to implement strict water resources management regime. The North and South of China have different characteristics in water production and utilization, and the existing problems are different as well. Therefore, to fully understand the characteristics of different regions is a prerequisite for water resources management according to local conditions and differences. Jiangxi, Hubei and Zhejiang provinces in the South, and Shandong, Hebei and Gansu provinces in the North are selected for the comparison. Differences of water production and utilization in six provinces are analyzed and compared in terms of precipitation, runoff coefficient, water production modulus, and water use, water consumption rate, quantity of water use, consumption and drainage, as well as water use efficiency. It's suggested that the three northern provinces should focus on water consumption control, and the improvement of water use efficiency , whereas the three southern provinces should enhance water use control, reduce emissions into the rivers, and  improve the quality of wastewater. Related Articles | Metrics | Comments（0）

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