Geomechanics and Engineering

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Evolution of sandstone shear strength parameters and its mesoscopic mechanism

  • Shi, Hao (State Key Laboratory for Geomechanics & Deep Underground Engineering, School of Mechanics & Civil Engineering, China University of Mining and Technology) ;
  • Zhang, Houquan (State Key Laboratory for Geomechanics & Deep Underground Engineering, School of Mechanics & Civil Engineering, China University of Mining and Technology) ;
  • Song, Lei (State Key Laboratory for Geomechanics & Deep Underground Engineering, School of Mechanics & Civil Engineering, China University of Mining and Technology)
  • Received : 2019.11.25
  • Accepted : 2019.12.26
  • Published : 2020.01.10
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Abstract

It is extremely important to obtain rock strength parameters for geological engineering. In this paper, the evolution of sandstone cohesion and internal friction angle with plastic shear strain was obtained by simulating the cyclic loading and unloading tests under different confining pressures using Particle Flow Code software. By which and combined with the micro-crack propagation process, the mesoscopic mechanism of parameter evolution was studied. The results show that with the increase of plastic shear strain, the sandstone cohesion decreases first and then tends to be stable, while the internal friction angle increases first, then decreases, and finally maintains unchanged. The evolution of sandstone shear strength parameters is closely related to the whole process of crack formation, propagation and coalescence. When the internal micro-cracks are less and distributed randomly and dispersedly, and the rock shear strength parameters (cohesion, internal friction angle) are considered to have not been fully mobilized. As the directional development of the internal micro-fractures as well as the gradual formation of macroscopic shear plane, the rock cohesion reduces continuously and the internal friction angle is in the rise stage. As the formation of the macroscopic shear plane, both the rock cohesion and internal friction angle continuously decrease to a certain residual level.

Keywords

Acknowledgement

Supported by : Central Universities, National Natural Science Foundation of China

Financial supports for this work, provided by the Fundamental Research Funds for the Central Universities (No. 2018ZDPY08), the National Natural Science Foundation of China (No. 41974164) and the Chinese Government Scholarships (No. 201906420030), are gratefully acknowledged.

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