Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (2): 81-87.doi: 10.3969/j.issn.1000-565X.2014.02.013

• Architecture & Civil Engineering • Previous Articles     Next Articles

Laboratory Test and Parameter Back Analysis of Residual Strength of Slip Zone Soils

Liu Dong Chen Xiao- ping   

  1. College of Science and Engineering∥Key Laboratory of Disaster Forecast and Control in Engineering of the Ministry of Education,Jinan University,Guangzhou 510632,Guangdong,China
  • Received:2013-07-04 Revised:2013-11-06 Online:2014-02-25 Published:2014-01-02
  • Contact: 陈晓平(1957-)，女，教授，博士生导师，主要从事土力学与基础工程的教学与研究． E-mail:chenxp@jnu.edu.cn
  • About author:刘动(1986-)，男，博士生，主要从事土力学与基础工程、边坡工程等的研究．E-mail:liudong04@126．com
  • Supported by:

    国家自然科学基金资助项目(11072088);广东省水利科技创新项目(YSK2009- 01)

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Abstract:

Systematic ring shear tests of the sand clay in an ancient landslide were carried out in laboratory to revealthe effect of coarse grain content on the residual shear character and residual strength of slip zone soils,and a backanalysis was carried out with multiple similar sections.Then,the calculated residual strength was comprehensivelycompared with that obtained by laboratory test,with a suitable residual strength of ancient landslide being recom-mended.The results show that (1) the ring shear test is an ideal method to obtain the residual strength under largeshear displacement; (2) different from common clay,the slip zone soil is of no obvious strain- softening character,and the strain softening becomes weaker when the coarse grain content increases; and (3) at high coarse grain con-tent,the equivalent residual internal friction angle nonlinearly increases with the coarse grain content.

Key words: slip zone soil, residual strength, ring shear test, strain softening, back analysis calculation