基于大型直剪试验的土石混合体剪切带变形特征试验研究

doi:10.13722/j.cnki.jrme.2017.1321

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Abstract Soil-rock mixture has the characteristics of distinct heterogeneity，obvious structural and size effects，and thus has the complex mechanical properties. In this research，the deformation properties and the influencing factors of shear band of soil-rock mixture during the shearing process were investigated with the servo motor controlled system of geotechnical experiment developed in-house(RSM-1000). The shear band deformation tests on soil-rock mixture were conducted considering the effects of different rock contents(0，30%，50%，70%)，normal pressures(50，200，300，400 kPa) and rock sizes(L1，L2，L3) respectively. The deformation characteristics of shear band were monitored by putting the aluminum wires and dry ash into the hole inside the samples. The results show that when the rock content is less than 30%，rocks have little effect on the deformation of samples，and that the mechanical strengths of samples mainly depend on the sand. When the rock content reaches 50%，samples are transformed into a skeleton structure，rocks have obvious effects on deformations and the mechanical strengths of samples are affected by rocks and sand simultaneously. When the rock content reaches 70%，samples are transformed into the rock structure with empty space. Under the condition of high rock content and rock particles of large diameter，the rocks through the shear surface tend to extrude and roll during the shear process. The rocks around the shear surface are mainly affected by dilation，and present extrusion，particle breakage and redistribution. The shearing deformations of the samples are comprised of three distinct stages and can be depicted as the failure of thrust landslide with the deformation from back to front or compound landslide with the deformation from two slides to the middle. At the first stage，the cracks were generated on the top of the backward slope under the effect of active soil pressure，which leads to the sink，compaction and instability of the top of backward slope. Then，the front edge of the slope begins to deform and move forward. Finally，the shearing dislocation of the soil-rock mass and the progressive expansion failure of the sliding face result in the cut-through of shearing plane and the whole destruction of the slope.

Key words： soil mechanics soil-rock mixture(SRM) landslide sliding zone shear band structure effect size effect large scale direct shear test

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	HU Feng1
	2
	3
	LI Zhiqing1
	2
	3
	HU Ruilin1
	2
	3
	ZHOU Yingxin4
	5
	YUE Ruiqiang5

Cite this article:

HU Feng1,2,3, et al. Research on the deformation characteristics of shear band of soil-rock#br# mixture based on large scale direct shear test[J]. , 2018, 37(3): 766-778.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1321 OR http://www.rockmech.org/EN/Y2018/V37/I3/766

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