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Advances in Materials Science and Engineering
Volume 2017, Article ID 9641258, 15 pages
Research Article

Determination of the Peak and Residual Shear Strengths of the Sandwich Material in Slopes

1School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu 610500, China
2School of Transportation and Logistics, Southwest Jiaotong University, Chengdu 610031, China

Correspondence should be addressed to Qijie Cai; nc.ude.utjws.ym@tjwseijiqiac

Received 22 January 2017; Accepted 3 April 2017; Published 30 April 2017

Academic Editor: Luigi Nicolais

Copyright © 2017 Qijun Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The mudded weak interlayer is a geotechnical sandwich material exhibiting strain softening behavior, which plays an important part in the slope stability. The present work primarily focuses on the shear strength of the mudded weak interlayer in rock slopes. To determine the peak and residual shear strengths of the mudded weak interlayers, the particle flow code (PFC) is used to simulate the failure behavior during the direct shear tests. Laboratory investigations including uniaxial compression test, SEM, and 3D deformation measurement are employed to calibrate the essential micro parameters of the mudded weak interlayer during the simulation process in PFC. The numerical model is built based on these parameters and both the peak and residual shear strengths can be predicted from the model. The prediction results show that the peak and residual internal friction angle are 19.36° and 14.61°, while the peak and residual cohesion are 22.33 kPa and 2.73 kPa, respectively. Moreover, to validate the obtained peak and residual strengths, the results are compared with literature data. The peak and residual shear strengths of the mudded weak interlayer can serve as an important benchmark to evaluate the stability of side slopes and provide guiding suggestions for their reinforcement.