块石强度对土石混合料剪切特性的影响

doi:10.13722/j.cnki.jrme.2020.0488

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Abstract The insufficient strength of rock blocks is one of the most important reasons for the instability of large soil-rock mixture(S-RM) filling bodies. In order to deeply explore the influence of the strength of rock blocks on the shear characteristics of the S-RMs and to make up for the deficiencies in the current research field，systematic research was conducted utilizing indoor large-scale direct shear test and discrete element numerical simulation(PFC) based on a great filling project in Chongqing. The macroscopic performances and microcosmic mechanisms of the block strength affecting the shear deformation，the peak shear strength，the crack extension process and the way of the energy response of the S-RM were revealed finally. The results show that，under a high axial pressure，the shear characteristics of the S-RMs with different distinct block strengths are remarkably different. The stress-strain relationships for hard and soft rock mixtures are respectively characterized by strain hardening and strain softening. The shearing process is basically consistent with the linear Mohr-coulomb strength theory，and with increasing the block strength，the internal friction angle and the peak shear strength of the mixture increase while the cohesion shows a trend of increasing first and then decreasing. The greater the block strength，the more complete the fracture development and the greater the fracture density. The hard rock shows a strong remolding ability which makes the mixture tend to form a shear plane with a complex cross-section，while the shear plane of the soft rock mixture is almost the same as that of plain soils. In the shearing process，the hard rock mixture dissipates the energy mainly in the way of friction，while the soft rock mixture absorbs and stores deformation energy mainly through the plastic deformation and the adjustment of spatial positions between rock blocks. Finally，PFC numerical simulation software was adopted to further expand the analysis，and a shear strength prediction model of S-RMs was proposed.

Key words： soil mechanics soil-rock mixture shear properties rock strength PFC strength prediction mode

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	YANG Zhongping1
	2
	3
	ZHAO Yalong1
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	3
	HU Yuanxin4
	LI Shiqi1
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	3
	LEI Xiaodan1
	5
	LI Xuyong1
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	3

Cite this article:

YANG Zhongping1,2,3, et al. Effect of the strength of rock blocks on the shear characteristics of soil-rock mixtures[J]. , 2021, 40(4): 814-827.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0488 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I4/814

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