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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摘要土石混合体作为土体和碎石的混合体，其宏观力学特性与碎石特性密切相关。采用试验研究和数值模拟相结合的方法，对土石混合体的力学特性进行研究。基于FISH语言开发颗粒流的多边形碎石生成模块，通过室内试验校核颗粒流模型的细观参数，建立土石混合体双轴试验模型。提出以形状因子m作为衡量碎石磨圆度的指标，对碎石形状进行了量化。研究了碎石含量、强度、形状对土石混合体力学特性影响，探讨碎石对土体强度提高的细观原因，揭示土石混合料的强度指标随各主要影响因素的变化趋势。结果表明：碎石含量和强度越高，混合体的强度也越高，当含石量小于40%时，土石混合体的力学特性受土体主导；内摩擦角随着碎石含量增加而增大，而黏聚力却在减小；随着形状因子的增大，强度降低，黏聚力和内摩擦角均减小；土石混合体中应力分布不均，在碎石含量较高时，碎石形成骨架效应，承担了主要荷载。

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关键词 ：土力学, 土石混合体, 颗粒流, 碎石形状, 力学特性

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

引用本文:

田湖南，焦玉勇，王浩，马江锋. 土石混合体力学特性的颗粒离散元双轴试验模拟研究[J]. 岩石力学与工程学报, 2015, 34(s1): 3564-3573.
TIAN Hunan，JIAO Yuyong，WANG Hao，MA Jiangfeng. RESEARCH ON BIAXIAL TEST OF MECHANICAL CHARACTERISTICS ON SOIL-ROCK AGGREGATE(SRA) BASED ON PARTICLE FLOW CODE SIMULATION. , 2015, 34(s1): 3564-3573.

链接本文:

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

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