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Determination of peak and residual shear strength of slope interlayer materials

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Document pages: 15 pages

Abstract: Argillaceous weak interlayer is a kind of geotechnical interlayer material with strain softening characteristics, which plays an important role in slope stability. This paper mainly studies the shear strength of argillaceous weak interlayer of rock slope. In order to determine the peak and residual shear strength of argillaceous weak interlayer, particle flow code (PFC) is used to simulate the failure behavior during direct shear test. Laboratory investigation, including uniaxial compression test, SEM and PFC simulation, the basic micro parameters of argillated weak interlayer are calibrated by three-dimensional deformation measurement, and a numerical model is established based on these parameters, from which the peak shear strength and residual shear strength can be predicted.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.

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