Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (5): 1291-1303.doi: 10.16285/j.rsm.2020.1113

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Investigation on macro-meso cumulative damage mechanism of weak layer under pre-peak cyclic shear loading

LIU Xin-rong1, 2, 3, XU Bin1, 2, 3, ZHOU Xiao-han1, 2, 3, XIE Ying-kun4, HE Chun-mei5, HUANG Jun-hui1, 2, 3   

  1. 1. School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing University, Chongqing 400045, China; 3. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China; 4. Chongqing Chuandongnan Survey & Design Institute Co., Ltd., Chongqing 400038, China; 5. College of Architectural Engineering, Neijiang Normal University, Neijiang, Sichuan 641100, China
  • Received:2020-07-30 Revised:2021-01-13 Online:2021-05-11 Published:2021-05-07
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41972266, 41772319), the National Key Research and Development Program of China (2018YFC1504802) and the Chongqing Postdoctoral Science Foundation of China (cstc2019jcyj-bshX0072).

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Abstract: To investigate the macro-meso cumulative damage mechanism of the weak layer considering the impacts of various factors, the pre-peak cyclic shear tests and PFC2D meso numerical simulations were conducted. The results indicate that: (1) Three stages, i.e., initial compression-shear nonlinear deformation (elastic zone), nonlinear deformation of the cumulative damage due to the stress climb (elastic-plastic zone) and plastic deformation with constant stress (plastic zone), are observed in the weak layer cyclic shear deformation evolution curve and strength evolution curve. (2) The peak (residual) strength and cumulative shear (normal) deformation of the weak layer decreases and increases respectively as the cyclic shear times increase under the same conditions of moisture content, normal stress, shear rate, shear amplitude or relative thickness; conducted with the same cyclic shear times, the peak (residual) strength decreases, increases, decreases, decreases and increases with the increase of the mentioned factors in turn, while the variations of cumulative shear (normal) deformation present the opposite trends. (3) The evolution curve of the meso cumulative damage crack quantity includes four stages, i.e., a slight-steep, slow, steep and slight increase in the initial, preliminary, middle and later stages, respectively. Meanwhile, the weak layer energy evolution curve includes three stages, i.e., a steep, slow and slight increase in the preliminary, middle and later stages, respectively; besides, the meso-damage particles are distributed on both sides of the shear plane in an approximately “banded S-shape”. (4) The macro-meso cumulative damage failure modes of the weak layer can be summarized into three basic types, including the compacting-cracking failure (dilatancy effect), abrading-dislocating- gnawing failure (dilatancy-loosening-shrinkage effect) and penetrating-sliding failure (shrinkage effect).

Key words: weak layer, pre-peak cyclic shear, PFC2D, failure mode, evolution process, cumulative damage mechanism

CLC Number: 

  • TU 411
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