Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (12): 3919-3928.doi: 10.16285/j.rsm.2019.1824

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Effects of rock contents and particle breakage on strength characteristics of soil-rock aggregate

TU Yi-liang1, 2, 3, 4, LIU Xin-rong5, REN Qing-yang1, 2, CHAI He-jun3, WANG Jun-bao4, YU Jia-yu1   

  1. 1. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing, 400074, China; 2. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 3.China Merchants Chongqing Communications Research & Design Institute Co., Ltd., Chongqing 400067, China; 4. Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China; 5. College of Civil Engineering, Chongqing University, Chongqing 400045, China
  • Received:2019-10-23 Revised:2020-08-10 Online:2020-12-11 Published:2021-01-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51808083), the China Postdoctoral Science Foundation(2020M673110), the Basic Research and Frontier Exploration Project of Chongqing, China(cstc2018jcyjAX0491), the Science and Technology Research Program of Chongqing Municipal Education Commission(KJQN201800713), the Opening Foundation of State Key Laboratory of Mountain Bridge and Tunnel Engineering(SKLBT-19-011) and the Opening Foundation of Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering(YT201904).

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Abstract: The characteristics of particle breakage and shear strength of soil-rock aggregate with six rock contents under six normal pressures were studied from macro and mecro perspectives by large-scale direct shear test, particle observation test and particle sieving test. The relationship between macroscopic shear strength properties and mecroscopic particle breakage characteristics was established, thus further revealing the influence mechanism of rock content and particle breakage on the shear strength characteristics of soil-rock aggregate. The results showed that particle breakage mainly occurred near the shear plane. The breakage morphology can be divided into surface grinding, local fracture, complete fracture and complete breakage, resulting from the stress concentration caused by uneven contact forces between particles. Due to particle breakage, the content of fine particles increased, coarse grains decreased, and intermediate grains fluctuated. The relative particle breakage Br increased with the increase of normal pressure ?n or rock content P5, which accorded with the function of two variables. With the increase of normal pressure ?n, the shear strength τ increased nonlinearly and met the modified M-C strength criterion. When the rock content P5 increased, the cohesive force c0 of soil-rock aggregate decreased, the internal friction angle ?0 of soil-rock aggregate increased, and the non-linear parameter Δ? increased. Particle breakage was the direct cause of non-linear strength characteristics of soil-rock aggregate.

Key words: soil-rock aggregate, particle breakage, rock content, shear strength characteristic, direct shear test

CLC Number: 

  • TU411.3
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