土石混合料剪切机理及抗剪强度分量特性研究

吴帅峰; 蔡红; 魏迎奇; 肖建章; 严俊

doi:10.11779/CJGE2019S2058

土石混合料剪切机理及抗剪强度分量特性研究 English Version

中国水利水电科学研究院,北京 100038

基金项目: 国家重点研发计划项目（2017YFC0804607）

详细信息

作者简介:
吴帅峰(1988— ),男,博士（后）,工程师,主要从事岩土动力学与大坝岩土工程等方面的科研工作。E-mail: wusf@iwhr.com。

通讯作者:
蔡红，E-mail：caihong@iwhr.com

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出版历程
- 收稿日期: 2019-04-27
- 发布日期: 2019-07-19

Shear mechanism and shear strength component characteristics of soil-stone mixtures

China Institute of Water Resources and Hydropower Research, Beijing 100038, China

摘要

摘要: 为研究土石混合料剪切机理和抗剪强度分量特性,制备了7种级配类型土石料,涵盖了良好级配、均匀粒径、缺失中间粒径3种典型情况,代表了含石量在10%~75%的形态,在此条件下对剪切强度与级配-含石量关系、剪切机理及剪切强度分量的构建模型进行了研究。得到土石料中粗颗粒含量的多少是决定强度的关键因素;土石混合料的抗剪强度由咬合分量、摩擦分量和破碎分量共同构成,通过分析得出摩擦分量占总抗剪强度约10%,从颗粒细观运动的角度的剪切运移力学过程推导出咬合分量与摩擦分量的理论模型公式,该模型公式涵盖了含石量、初始接触水平角、内摩擦角、粒径等参数信息;由该模型计算得出咬合与摩擦分量占比与含石量呈指数正相关趋势,并给定该边界条件下的函数表达式。从理论上揭示了土石混合料剪切机理和抗剪强度的构成分量模型。
- 土石混合料 /
- 抗剪强度 /
- 强度分量 /
- 分量模型 /
- 含石量
Abstract: In order to study the shear mechanism and shear strength component characteristics of soil-rock mixtures, seven groups of graded soil-stone materials are prepared, covering three typical cases of good gradation, uniform particle size and missing intermediate particle size, representing the forms of stone content in the range of 10% to 75%. Under this condition, the construction models for shear strength and gradation-stone content, shear mechanism and shear strength component are studied. It is concluded that the content of coarse particles in soil-stone mixtures is the key factor to determine the strength. The shear strength of soil-rock mixtures is composed of the occlusal component, friction component and fracture component. Through analysis, the friction component accounts for about 10% of the total shear strength, and the theoretical model formula for the occlusion component and friction component is deduced from the shear transport mechanics process from the angle of the micro-motion of particles. The model formula covers the parameters such as stone content, initial contact horizontal angle, internal friction angle and particle size. From the calculation of the model, it is found that the proportion of occlusion and friction components is exponentially positively correlated with the stone content, and the functional expression under the boundary condition is given.
- soil-rock mixture /
- shear strength /
- strength component /
- component model /
- stone content

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参考文献(10)

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