土石混合体力学特性的颗粒离散元双轴试验模拟研究

doi:10.13722/j.cnki.jrme.2014.0449

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Abstract The soil-rock aggregate(SRA) is composed of soil and rock block and the mechanical characteristics of SRA are closely related to features of rock block. A combination method of experiment research and numerical simulation has been used to study the mechanical properties of SRA. The polygonal rock block generation module was developed using the FISH language. Through laboratory experiments，the relation between macro- and meso-properties was studied. The shape factor m is proposed to quantify the psephicity of rock block. The PFC model of SRA was established to analyze the effects of rock block features(such as rock block content，rock block strength and rock block shape) on mechanical characteristics of SRA. The micro reason for enhancing strength performance of the SRA which contains a certain amount of rock block was studied. The change tendency of SRA strength parameters affected by factors was revealed. The simulation results indicate that the shear strength of SRA increases with the increase of rock block content and rock block strength. When the rock block content is less than 40%，the mechanical characteristics of SRA are dominated by soil. The internal friction angle increases and the cohesion decreases linearly with the increase of rock block content. With the increase of the shape factor m the shear strength of SRA decreases，and the internal friction angle and cohesion decreases. The stress distribution is uneven in SRA. The rock blocks，which generate skeleton，bear the majority of the load.

Key words： soil mechanics soil-rock aggregate(SRA) particle flow code(PFC) rock block shape mechanical characteristics

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.0449 OR http://www.rockmech.org/EN/Y2015/V34/Is1/3564

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