New Method for Determination of Residual Strength Parameters and Critical Damage Value

  • Qiao Jiang China Three Gorges University
  • Jianlin Li China Three Gorges University
  • Yanhai Wang China Three Gorges University
  • Zuosen Luo China Three Gorges University
  • Tao Li China Three Gorges University
  • Hengbin Zhang China Three Gorges University
  • Eleyas Assefa Addis Ababa Science and Technology University
  • Huafeng Deng China Three Gorges University

Abstract

Residual strength and critical damage parameters are worthy to evaluate the stability of engineered rock masses. In this paper, new thinking, repeated load test on a single specimen was proposed to measure the residual strength of the rock. And author proposed to modify the critical damage value based on residual constitutive energy. The test results showed that: (1) the residual strength of rock is mainly controlled by the confining pressure, without a clear relationship with the confining pressure and stress path of the initial loading failure. (2) The residual strength parameters of the rock specimens under repeated loading test are consistent with the conventional triaxial test. Most importantly, the proposed method is relatively less dispersion, cheap, reliable, and time-saving. (3) The corrected critical damage value was reasonable. Relevant test methods can provide a useful reference for the determination of residual strength parameters and critical damage value.

Keywords: single specimen method, repeated loading, residual strength, critical damage value, dispersion
Published online
2019-04-25
How to Cite
Jiang, Q., Li, J., Wang, Y., Luo, Z., Li, T., Zhang, H., Assefa, E., & Deng, H. (2019). New Method for Determination of Residual Strength Parameters and Critical Damage Value. Periodica Polytechnica Civil Engineering, 63(2), 569-576. https://doi.org/10.3311/PPci.13817
Section
Research Article