不同含石量条件下堆积体抗剪强度特性的大型直剪试验研究

杨继红; 董金玉; 黄志全; 郑珠光; 齐丹

doi:10.11779/CJGE2016S2026

不同含石量条件下堆积体抗剪强度特性的大型直剪试验研究 English Version

华北水利水电大学资源与环境学院,河南郑州 450045

基金项目: 国家自然科学基金青年基金项目（41102203）; 河南省高等学校青年骨干教师资助计划项目（2014GGJS-067）; 水利部公益性行业科研专项经费项目（201301034）; 华北水利水电大学2014年“青年科技创新人才支持计划”项目（70430）

详细信息

作者简介:
杨继红（1976- ）,女,河南巩义人,副教授,博士,主要从事地质工程方面的教学和科研工作。E-mail: yjh04616@126.com。

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出版历程
- 收稿日期: 2016-05-18
- 发布日期: 2016-10-19

Large-scale direct shear tests on accumulation body with different stone contents

School of Resources and Environment, North China University of Water Resources and Electric Power, Zhengzhou 450045, China

摘要

摘要: 由土石混合介质组成的堆积体边坡在中国有着广泛的分布,尤其是库区巨型、大型松散堆积体边坡的变形及稳定性更是水电工程建设中极为关注的问题。针对该类边坡物质组成和结构的复杂多变性,选择三峡库区典型堆积体边坡进行现场调查和取样,通过室内大型直剪试验,系统地研究了含石量对堆积体剪应力-位移曲线和抗剪强度的影响规律。含石量对土石混合介质堆积体的强度和变形特性具有控制作用,随着含石量的变化,堆积体剪应力-位移关系曲线可拟合为指数模型、双曲线模型和应变软化介质模型3种形式;随着含石量的增加,堆积体抗剪强度逐渐增大;黏聚力随含石量的增加呈现出先增大后减小的趋势,即存在一个临界含石量约为60%,黏聚力-含石量变化曲线为二次多项式形式;内摩擦角与含石量关系呈现一直增大趋势,其变化曲线近似为指数形式。
- 土石混合介质堆积体 /
- 含石量 /
- 室内大型直剪试验 /
- 剪应力-位移关系曲线 /
- 抗剪强度
Abstract: The accumulation bodies composed of soil-rock mixture are widely distributed in China. The deformation and stability of huge and large-scale loose accumulation bodies in reservoir areas are extremely concerned during construction of hydroelectric projects. Aiming at the complex property and material composition of accumulation slopes, the typical accumulation slopes in Three Gorges Reservoir region are studied through field investigation, sampling and laboratory tests. The influences of stone contents on the relationship between shear stress and displacement and soil strength parameters are analyzed by using the large-scale direct shear tests. Mechanical properties and deformation of accumulation bodies are controlled by the stone contents. With change of the stone content, the relation curves of shear stress and displacement are classified into three types: exponential curve, hyperbolic form and strain softening. The cohesion of accumulation body increases with the increment of the stone content in the form of quadratic polynomial curve, and generally it reaches the peak value when the stone content is about 60%, then it decreases as the stone content increases. The internal friction angle increases with the increment of the stone content in the form of exponential curve.
- soil-rock accumulation body /
- stone content /
- lab large-scale direct shear test /
- shear stress- displacement relation /
- shear strength

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参考文献(15)

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