Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (4): 965-974.doi: 10.16285/j.rsm.2021.2052

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Influence of the block stone size on shear mechanical behavior of soil-rock mixture-bedrock interface

YANG Zhong-ping1, 2, 3, LI Jin1, 2, 3, LIU Hao-yu1, 2, 3, ZHANG Yi-ming1, 2, 3, LIU Xin-rong1, 2, 3   

  1. 1. School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China; 3. National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area (Chongqing), Chongqing University, Chongqing 400045, China
  • Received:2021-12-19 Accepted:2022-07-01 Online:2023-04-18 Published:2023-04-27
  • Supported by:
    This work was supported by the General Program of Chongqing Natural Science Foundation (cstc2021jcyj-msxmX0558) and the National Key Research and Development Program (2021YFB3901402).

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Abstract: The shear strength of the soil-rock mixture-bedrock interface is a key parameter for the stability of the slope and engineering design. In order to explore the influence of the block stone size on the shear mechanical behavior of the soil-rock mixture-bedrock interface, a series of large-scale laboratory shear tests of the soil-rock mixture-bedrock interface with different block stone sizes was carried out. The results show that the failure mode of the contact interface is not significantly affected by the size of the block stone and the normal pressure, and both are characterized by strain hardening. However, the normal pressure will weaken the impact of the block stone size effect. As the size of the block stone increases, the shear strength and the shear strength index (φ, c) first increased and then decreased. There are both a positive size effect and a negative size effect. The size effect has a limited influence on the angle of internal friction φ , which fluctuates around 29º. However, the size effect has a significant influence on the apparent cohesion c. The specimens with different block sizes show obvious shear contraction behavior under different normal pressures, and the normal pressure can enhance the shear contraction characteristics of the soil-rock mixture. The soil-rock mixture-bedrock interface is a weak potential slip surface. With the increase of the block size coefficient, the weak failure surface tends to transform into the soil-rock mixture.

Key words: contact interface, size effect, soil-rock mixture, shear mechanical behavior

CLC Number: 

  • TU452
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