蠕滑滑坡滑带土强度及其参数特性试验研究  

Experimental Study on Strength and Parameter Characteristics of Slip Zone Soil of Creep Landslide

作　　者：吴岱諠 曹世超 吴琦 王现国[2] 闫亚景 WU Daixuan;CAO Shichao;WU Qi;WANG Xianguo;YAN Yajing(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;No.2 Institute of Geological & Mineral Resources Survey of Henan,Zhengzhou 450012,China)

机构地区：[1]华北水利水电大学地球科学与工程学院,河南郑州450046 [2]河南省地矿局第二地质矿产调查院,河南郑州450012

出　　处：《人民黄河》2019年第7期143-147,共5页Yellow River

基　　金：国家自然科学基金资助项目(U1704243);华北水利水电大学第九届研究生创新课题(YK2017-11)

摘　　要：金坪子滑坡Ⅱ区为一巨型蠕滑滑坡,为了研究该滑坡在诱发因素影响下的强度变化规律,以滑坡Ⅱ区滑带土为研究对象,通过不同剪切速率、不同含水率和正应力下的环剪试验,研究了其强度特性,结果表明:滑带土应变软化现象明显,已达到稳定残余状态的滑带土随着剪切速率的改变其抗剪强度出现增大的现象,并且正应力越大,强度恢复的幅度越大,其原因可能是剪切速率的改变使其剪切模式发生了变化;峰值强度参数中黏聚力、内摩擦角均随含水率的增大而线性减小,但黏聚力的变化幅度比内摩擦角的大,残余黏聚力与含水率成负相关关系,残余内摩擦角变化很小。The Jinpingzi landslide is an old landslide to the arch dam of Wudongde Hydropower Station in the downstream direction on the right bank of Jinsha River. The displacement monitoring data shows that the landslide zone II presents an overall creep slip with a non-con-stant rate. In order to study the rule of strength change of landslide slip zone, its active zone Ⅱwas studied. A series of ring shear tests under different shear rates, moisture content and normal pressure was employed. Its strength characteristics were studied. It could provide reference for the protection and management of similar landslides. It is found that the phenomenon of sliding soil strain softening is obvious. The strength of the sliding zone increases with the change of shear rate and the greater the positive stress, the greater the magnitude of strength re-covery. The reason may be that the shear rate changes its shear mode. The cohesion and internal friction angle of the peak strength parameters decrease linearly with the increase of moisture content and the change range of cohesion is greater than the internal friction angle. Residual cohesion is negatively correlated with moisture content and the residual internal friction angle has little change.

关 键 词：滑带土 环剪试验 剪切速率 含水率 强度参数 

分 类 号：P642.2[天文地球—工程地质学]