Disintegration test of compacted granite residual soil taken from Shenzhen was carried out in consideration of iron oxide content, water content, and dry density. Test results demonstrated that the compacted granite residual soil disintegrated quickly, during which the disintegrated materials gradually peeled off from the soil specimen from the form of small particles to debris and then to mud, until the soil sample completely disintegrated. The disintegration process of soil was mainly affected by the content of iron oxide rather than by the physical state of soil specimen. The disintegration rate of compacted granite residual soil changed with time in three modes: surged at first and then plummeted; surged at first and then stabilized; multiple peaks appeared. The maximum disintegration rate climbed with the expansion of iron oxide content but dropped with the increase of the water content and dry density. The degree of the impact of water content on complete disintegration time depended on dry density. In the presence of small dry density, the time required for complete disintegration changed within a small range; when dry density exceeded 1.50 g/cm3, the time required for complete disintegration elongated gently with the rise of water content. Given the same water content, the time required for complete disintegration gradually increased with the rising of dry density.
Key words
road engineering /
granite residual soil /
disintegration characteristics /
iron oxide /
dry density /
water content
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References
[1] 胡其志,洪昌伟,刘 恒,等.黏粒含量对花岗岩残积土渗透与强度特性的影响[J].长江科学院院报,2020,37(9):64-69.
[2] 鲍晓东.深圳地区花岗岩残积土工程特性的研究[J].铁道勘察,2004(2):72-74.
[3] ABAD S V A N K, TUGRUL A, GOKCEOGLU C, et al. Characteristics of Weathering Zones of Granitic Rocks in Malaysia for Geotechnical Engineering Design[J]. Engineering Geology, 2016, 200: 94-103.
[4] PRADHAN A M S, KIM Y T. Application and Comparison of Shallow Landslide Susceptibility Models in Weathered Granite Soil under Extreme Rainfall Events[J]. Environmental Earth Sciences, 2015, 73: 5761-5771.
[5] FAN G, ZHANG L M, ZHANG J J, et al. Time-frequency Analysis of Instantaneous Seismic Safety of Bedding Rock Slopes[J]. Soil Dynamics and Earthquake Engineering, 2017, 94: 92-101.
[6] LIU Wei-ping, SONG Xin-qiang, LUO Jia, et al. The Processes and Mechanisms of Collapsing Erosion for Granite Residual Soil in Southern China[J]. Journal of Soils and Sediments, 2020, 20: 992-1002.
[7] 唐 军, 余 沛, 魏厚振, 等.贵州玄武岩残积土崩解特性试验研究[J].工程地质学报,2011,19(5):778-783.
[8] 李建新, 陈秋南, 赵 柳, 等.南岳地区全风化花岗岩崩解特性试验研究[J].湖南科技大学学报(自然科学版),2015,30(4):59-63.
[9] 张先伟, 孔令伟, 陈 成, 等.炎热多雨和突降暴雨气候影响下玄武岩残积土的崩解试验研究[J].中国科学:技术科学,2016,46(11):1175-1184.
[10] 苏 华, 郝 勇.被动区花岗岩残积土弱化对深基坑的影响[J].长江科学院院报,2019,36(11):120-124,131.
[11] 高国瑞.中国红土的微结构和工程性质[J].岩土工程学报,1985(5):10-21.
[12] ASTM Standard D2487, Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)[S].West Conshohocken, PA: ASTM International, 2006.
[13] 张 抒,唐辉明.非饱和花岗岩残积土崩解机制试验研究[J].岩土力学,2013,34(6):1668-1674.
[14] 吴能森.结构性花岗岩残积土的特性及工程问题研究[D].南京:南京林业大学,2005.
[15] ZHOU X W, LIU P, LAN Z X. Experimental Study on Disintegration Behavior of Granite Residual Soil[C]//Proceedings of Geo-Hubei 2014 International Conference on Sustainable Civil Infrastructure. Yichang, Hubei, China. July 20-22, 2014: 98-104.
[16] 李建新. 南岳地区花岗岩残积土微观特性及崩解机理研究[D].湘潭:湖南科技大学,2014.
[17] 曾 朋. 花岗岩残积土的压实特性及崩解特性研究[D].广州:华南理工大学,2012.
[18] 张 抒. 广州地区花岗岩残积土崩解特性研究[D].武汉:中国地质大学,2009.
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