Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (10): 3789-3796.doi: 10.16285/j.rsm.2019.0267

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Model test study of the failure of silty sand slope under different seepage boundary conditions

BAO Xiao-hua1, LIAO Zhi-guang1, XU Chang-jie2, PANG Xiao-chao3, XIE Xiong-yao4, CUI Hong-zhi1   

  1. 1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China; 2. School of Civil Engineering & Architecture, East China Jiaotong University, Nanchang, Jiangxi 330013, China; 3. Shenzhen Research and Design Institute of China Academy of Railway Sciences, Shenzhen, Guangdong 518000, China; 4. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
  • Received:2019-01-28 Online:2019-10-11 Published:2019-10-19
  • Supported by:
    This work was supported by the Technological Innovation Project of Shenzhen City (JCYJ20170302143610976).

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Abstract: Studying the stability characteristics of silt sand slope under different seepage boundary conditions is of great significance to safety evaluation and disaster prevention of slope failure. An indoor slope model test system was developed. The model tests of slope instability under upper boundary infiltration, lateral boundary infiltration and bottom boundary infiltration were carried out respectively. The time histories of volumetric water content, pore water pressure, matrix suction at different positions inside the slope and failure process of the slope were analyzed and discussed. The results showed that soil changed from unsaturated state to saturated state in local place of the slope, the matric suction disappeared, and finally unstable regions and destruction formed on the slope surface under different seepage boundary conditions. Failure modes caused by upper boundary infiltration, lateral boundary infiltration and bottom boundary infiltration can be described as local shallow failure, multi-level retrogressive failure, and surface slide failure, respectively. By monitoring the volumetric water contents at different positions of the slope, an early warning system for slope instability caused by seepage can be proposed.

Key words: model test, slope failure, seepage boundary, unsaturated silty sand, matric suction

CLC Number: 

  • TU 441
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