滑带土中粘粒含量及含水量的变化对其强度影响的试验研究  

Experimental Study on Change of Clay Content and Water Content in Sliding Zone Soils on Strength

作　　者：帅常娥 石成 彭鹏[2,3] 

机构地区：[1]中船勘察设计研究院有限公司,上海市200331 [2]华东勘测设计研究院,杭州市310000 [3]武汉大学,武汉市430072

出　　处：《勘察科学技术》2012年第5期1-5,15,共6页Site Investigation Science and Technology

基　　金：国家自然科学基金项目(编号:50139030);水利部公益性行业科研专项经费项目资助(编号:200901064)

摘　　要：为了定量分析不同的滑带土颗粒级配情况下粘粒含量及含水量对粘聚力c和内摩擦角φ等强度参数的影响机制及变化规律,利用卡拉水电站田三滑坡体滑带土,进行了不同级配、不同粘粒含量及不同含水量组合的多组直剪试验方法,以揭示岩质边坡结构面中粘土矿物含量及含水量的变化对边坡岩体强度参数c、φ影响机制及变化规律。试验结果表明:当含水量不大于塑限时,c值随粘土矿物含量的增加而呈非线性增大,当含水量大于塑限时,c值随着粘土矿物的增加,先减小后增大,在粘粒含量为35%时c值最低;φ值随着粘粒含量的增加而减小,且在粘粒含量小于25%时φ值减小的速度较快,当粘粒含量大于25%时减小的速度减缓;并采用粒子群优化算法对试验成果作以解析。In order to quantitative analyze the influencing mechanism and change law of clay content and water content on the strength parameters as c,φ,the multi-group direct shear tests with the samples under different gradation,different water content and different clay content of Tiansan sliding zone soils in Kala hydropower station are conducted to reveal the influencing mechanism and change law of strength parameters c,φ of rock slope by the change in clay minerals and water content of structural plane. Some results were obtained：when water content is less than plastic limit,the value of c increases at first and then decreases with clay minerals content increasing;then it is higher than plastic limit,the value of c decreases at first then increases,and at last the minimum value of c is reached when the content of clay minerals is reached 35%;the value of φ reduces with clay content decreases,and when it′s less than 25%,the value of φ reduces faster;conversely,the value of φ reduces slowly.At the same time,the particle swarm optimization algorithms was used to analyze the results of test.

关 键 词：水-岩化学作用 边坡稳定性 结构面强度参数 粘土矿物含量 含水量 

分 类 号：TV221.2[水利工程—水工结构工程]