Coupled Model for the Long-term Pre-stress Loss ofAnchor Cable and Geotechnical Creep

DENG Dong-ping; LI Liang

doi:10.3969/j.issn.1001-5485.2015.08.012

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Journal of Changjiang River Scientific Research Institute ›› 2015, Vol. 32 ›› Issue (8) : 65-71. DOI: 10.3969/j.issn.1001-5485.2015.08.012

ROCK SOIL ENGINEERING

Coupled Model for the Long-term Pre-stress Loss ofAnchor Cable and Geotechnical Creep

DENG Dong-ping, LI Liang

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Abstract

Anchor cable is closely contacted with geotechnical body through reaction support. After a certain pre-stress is applied on anchor cable, the geotechnical body also deforms under the action of pre-stress. Due to the creep property of geotechnical body, its deformation doesn’t complete instantaneously but changes with time, which causes the long-term loss of pre-stress. In this research, anchor cable is equivalent to two models (elasticity body and generalized Kelvin body), and geotechnical body is assumed to be model of H+nK (n≤3) which could simulate the creep property of geotechnical body. According to the coupling deformation between anchor cable and geotechnical body and the initial conditions, formulas of calculating the pre-stress of anchor cable with the change of time are obtained. Through comparison with the results of previous studies, the correctness of this model is verified. Moreover, the fitting curve could be more consistent with the measured pre-stress variation if the number of K in creep model of geotechnical body is increased and the relaxation of anchor cable stress is considered in the theoretical model.

Key words

anchor cable / creep / coupling model / stress relaxation / loss of pre-stress

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DENG Dong-ping, LI Liang. Coupled Model for the Long-term Pre-stress Loss ofAnchor Cable and Geotechnical Creep[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(8): 65-71 https://doi.org/10.3969/j.issn.1001-5485.2015.08.012

References

[1] 何思明. 预应力锚索作用机理研究. 成都:西南交通大学,2004:1-14. (HE Si-ming. Study on Mechanism of Pre-stressed Anchor Rope. Chengdu:Southwest Jiaotong University,2004:1-14. (in Chinese))
ZHANG L L, XIA Y Y, GU J C, et al. Test Analysis of Stress Characteristics on Reinforcing Rock Slope with Group Anchorage Cable. Journal of Coal Science and Engineering, 2010, 16(1): 23-28.
ZHU W,ZHANG Y. Effect of Reinforcing the High Jointed Slopes of Three Gorges Flight Lock. Rock Mechanics and Rock Engineering, 1998, 31(1): 63-77.
CARRANZA-TORRES C. Analytical and Numerical Study of the Mechanics of Rockbolt Reinforcement around Tunnels in Rock Masses. Rock Mechanics and Rock Engineering, 2009, 42(2): 175-228.
韩斌,郑禄璟,王少勇,等. 复杂破碎露天边坡的综合加固技术. 中南大学学报(自然科学版),2013,44(2):772-777. (HAN Bin, ZHENG Lu-jing, WANG Shao-yong, et al. Synthetic Reinforcement of Complicated and Broken Open Pit Slope. Journal of Central South University (Science and Technology),2013,44(2):772-777. (in Chinese))
何美丽,刘霁. 预应力锚索地梁结构在边坡稳定中的作用机理. 中南大学学报(自然科学版),2013,44(6):2543-2548. (HE Mei-li, LIU Ji. Force Transmission Law of Pre-stressed Anchor-rope and Groundsill Structure in Slope Stability. Journal of Central South University (Science and Technology),2013,44(6):2543-2548. (in Chinese))
李厚恩,秦四清,孙强. 基坑支护锚杆预应力损失探讨及预测分析. 工程勘察,2007,35(4):7-10. (LI Hou-en,QIN Si-qing,SUN Qiang. Discussion and Prediction Analysis on Pre-stress of Foundation Pit Anchor. Geotechnical Investigation and Surveying,2007,35(4):7-10. (in Chinese))
叶慧飞. 锚索预应力损失变化规律分析. 杭州:浙江大学,2004:1-10. (YE Hui-fei. Analysis on Pre-stress Loss of Anchorage Cable. Hangzhou: Zhejiang University, 2004: 1-10. (in Chinese))
蒋楚生,周德培. 非圆弧滑面滑坡中满足平衡条件的预应力锚索设计拉力的确定方法. 铁道学报,2006,28(5):125-128. (JIANG Chu-sheng,ZHOU De-pei. Method for Determining the Designed Pulling Forces of Pre-stressed Cable Anchors Used for Non-circular Slip-surface Landslides under Equilibrium Conditions. Journal of the China Railway Society,2006,28(5):125-128. (in Chinese))
张发明,赵维炳,刘宁,等. 预应力锚索锚固荷载的变化规律及预测模型. 岩石力学与工程学报,2004,23(1):39-43. (ZHANG Fa-ming,ZHAO Wei-bing,LIU Ning,et al. Long-term Performance and Load Prediction Model of Pre-stressed Cables. Chinese Journal of Rock Mechanics and Engineering,2004,23(1):39-43.(in Chinese))
周永江,何思明,杨雪莲. 预应力锚索的预应力损失机理研究. 岩土力学,2006,27(8):1353-1356. (ZHOU Yong-jiang,HE Si-ming,YANG Xue-lian. Study on Pre-stress Loss of Anchor Cables under Long-term Loading. Rock and Soil Mechanics,2006,27(8):1353-1356. (in Chinese))
景锋,余美万,边智华,等. 预应力锚索预应力损失特征及模型研究. 长江科学院院报,2007,24(5):52-55. (JING Feng,YU Mei-wan,BIAN Zhi-hua,et al. Study on Pre-stress Loss Characteristic and Model of Pre-stressed Cable. Journal of Yangtze River Scientific Research Institute,2007,24(5):52-55.(in Chinese))
高大水,曾勇. 三峡永久船闸高边坡锚索预应力状态监测分析. 岩石力学与工程学报,2001,20(5):653-656.(GAO Da-shui,ZENG Yong. Monitoring Analysis on Pre-stress State of Anchor Cable of High Slope of the TGP Permanent Ship-locks. Chinese Journal of Rock Mechanics and Engineering,2001,20(5):653-656. (in Chinese))
李端友,汤平,李亦明. 三峡永久船闸一期工程岩锚预应力监测. 长江科学院院报,2000,17(1):39-42. (LI Duan-you, TANG Ping, LI Yi-ming. Safety Monitoring of Rock Anchor Pre-stress during 1st Stage Construction of TGP’s Permanent Lock. Journal of Yangtze River Scientific Research Institute,2000,17(1):39-42. (in Chinese))
张永安,李峰. 边坡锚索预应力长期监测成果分析. 工程勘察,2010,38(3):11-14. (ZHANG Yong-an,LI Feng. Analysis on Pre-stress State of Cable Applied to Slope Reinforcement. Geotechnical Investigation and Surveying,2010,38(3):11-14. (in Chinese))
杨志红,郭忠贤. 深基坑加固锚索预应力荷载变化规律的监测分析. 岩土工程学报,2012,34(增刊):145-148. (YANG Zhi-hong,GUO Zhong-xian. Monitoring Analysis of Pre-stressed Load of Anchor Cables for Deep Excavations. Chinese Journal of Geotechnical Engineering,2012,34(Sup.):145-148. (in Chinese))
齐明柱. 预应力锚索框架结构的现场原型试验研究. 北京:铁道科学研究院,2007:56-157. (QI Ming-zhu. Field Prototype Experimental Study on the Concrete Frame Structure with Pre-stressed Anchor Cable. Beijing:Academy of Railway Sciences,2007:56-157. (in Chinese))
景锋,成传欢,余美万,等. 锚索内锚段荷载分布及其随时间变化规律. 长江科学院院报,2011,28(5):50-54. (JING Feng,CHENG Chuan-huan,YU Me-iwan,et al. Load Distribution and the Law of Its Variation in the Inner Segment of Pre-stressed Anchor Cable. Journal of Yangtze River Scientific Research Institute,2011,28(5):50-54. (in Chinese))
范卫琴. 锚索预应力损失规律的数值模拟. 武汉:武汉理工大学,2007:35-57. (FAN Wei-qin. Numerical Simulation on Pre-stress Loss of Cable-bolt. Wuhan:Wuhan University of Technology,2007:35-57. (in Chinese))
朱晗迓,尚岳全,陆锡铭,等. 锚索预应力长期损失与坡体蠕变耦合分析. 岩土工程学报,2005,27(4):464-467. (ZHU Han-ya,SHANG Yue-quan,LU Xi-ming,et al. Coupling Analysis of Long-term Pre-stress Loss and Slope Creep. Chinese Journal of Geotechnical Engineering,2005,27(4):464-467. (in Chinese))
李英勇,王梦恕,张顶立,等. 锚索预应力变化影响因素及模型研究. 岩石力学与工程学报,2008,27(增1):3140-3146. (LI Ying-yong,WANG Meng-shu,ZHANG Ding-li,et al. Study on Influential Factors and Model for Variation of Anchor Cable Pre-stress. Chinese Journal of Rock Mechanics and Engineering,2008,27(Sup.1):3140-3146. (in Chinese))
周永江,何思明,杨雪莲. 预应力锚索的预应力损失机理研究. 岩土力学,2006,27(8):1353-1356. (ZHOU Yong-jiang,HE Si-ming,YANG Xue-lian. Study on Pre-stress Loss of Anchor Cables under Long-term Loading. Rock and Soil Mechanics,2006,27(8):1353-1356. (in Chinese))
周德培,朱本珍,毛坚强. 流变力学原理及其在岩土工程中的应用. 成都:西南交通大学出版社,1995:27-30. (ZHOU De-pei,ZHU Ben-zhen,MAO Jian-qiang. Rheological Mechanics and Its Application in Geotechnical Engineering. Chengdu:Southwest Jiaotong University Press,1995:27-30. (in Chinese))
陈安敏,顾金才,沈俊,等.软岩加固中锚索张拉吨位随时间变化规律的模型试验研究. 岩石力学与工程学报,2002,21(2):251-256. (CHEN An-min,GU Jin-cai,SHEN Jun,et al. Model Testing Research on the Variation of Tension Force of Anchor Cable with Time in Reinforcement of Soft Rocks. Chinese Journal of Rock Mechanics and Engineering,2002,21(2):251-256. (in Chinese))