土石混合介质堆积体力学特性试验研究  

Experimental Study on Mechanical Properties of Soil-rock Mixture

作　　者：杨继红[1] 齐丹[1] 郑珠光 李严威 王闯[1] 

机构地区：[1]华北水利水电大学,河南郑州450045

出　　处：《华北水利水电大学学报（自然科学版）》2016年第3期50-54,共5页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

基　　金：国家自然科学基金项目(41102203);河南省高等学校青年骨干教师资助计划项目(70593);水利部公益性行业科研专项经费(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)

摘　　要：由于堆积体边坡物质组成和结构的复杂多变性,其变形和稳定性成为工程建设中极为关注和亟待解决的问题之一。以三峡库区一典型堆积体边坡为例,根据现场调查和取样结果,通过室内大型直剪试验,研究不同含水率、含石量以及密实度情况下堆积体抗剪强度的变化规律。试验结果表明:细粒土含量越多,含水率对土石混合堆积体强度的影响越明显;当含石量在70%以上时,抗剪强度有急剧增大的趋势,堆积体试样的强度随密实度的增大而增大。研究结果不仅为堆积体变形和稳定分析提供基础资料,也为类似工程建设中遇到的堆积体边坡问题提供一定的参考。Because of the complicated structure and complex of the material composition and structure, the deformation and stability of talus slope is one of the most concerned and urgent solved problems in engineering construction. Taking a typical talus slope in Three Gorges Reservoir Area as an example in this article, based on the field investigation and sampling, the change characteristics of shear strength of soil-rock mixture was investigated under different water content, rock content and the compactness by large-scale direct- shear test in the lab. The results show： the more the content of fine-grained soil, the more obvious the effect of water content on the strength of soil-rock mixture; when the rock content is above 70% , the shear strength increases rapidly, the strength of the samples in- creases with the increase of the compactness. The research results not only provide basic data for the deformation and stability analysis of soil-lock mixture, but also provide a reference for the problems of talus slope in similar engineering construction.

关 键 词：土石混合介质堆积体 抗剪强度 大型直剪试验 密实度 含石量 含水率 

分 类 号：TV16[水利工程]