饱和粉质黏土残余强度剪切速率效应试验研究

第41卷第1期2019年2月

Vol.41No.1

Feb.2019三峡大学学报(自然科学版)

J of China Three Gorges Univ.(Natural Sciences)

DOI：10.13393/ki.issn.1672-948X.2019.01.012

引用格式：谢强，张国栋，胡学文，等.饱和粉质黏土残余强度剪切速率效应试验研究[J].三峡大学学报(自然科学版),2019,41(1):52-55.

饱和粉质黏土残余强度剪切速率效应试验研究

谢强123张国栋3,3胡学文1,2,3鲁剑楠°

(1・三峡大学湖北长江三峡滑坡国家野外科学观测研究站，湖北宜昌443002； 2.三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心，湖北宜昌443002； 3.三峡大学湖北省地质灾害防治工程技术研究中心，湖北宜昌443002； 4.宜昌市夷陵区公路管理局，湖北宜昌443100)

摘要：以三峡库区某滑坡滑带土为研究对象，通过环剪仪单级剪切试验研究不同法向应力条件

(25〜300kPa)下剪切速率(0.05〜10mm/min)对饱和粉质黏土残余强度的影响，研究结果表明：

在各法向应力条件下，残余强度均随剪切速率的增大而减小且两者呈非线性关系，表现出明显的

负速率效应•研究发现：较低剪切速率(VI mm/min)和较高法向应力(〉100kPa)时负速率效应更

显著•试验数据分析表明：残余强度与剪切速率呈良好的对数关系，拟合出了同时考虑法向应力和

剪切速率的正常固结条件下重塑饱和粉质黏土残余强度速率效应的经验公式及通用表达式•研究

成果为饱和粉质黏土环剪残余强度取值提供参考.

关键词：饱和粉质黏土；残余强度；剪切速率效应；环剪试验

中图分类号:TU435文献标识码：A文章编号：1672-948X(2019)01-0052-04

Experimental Researches on Residual Strength of

Saturated Silty Clay at Different Shear Rates

Xie Qiang1,2,d Zhang Guodong1,''Hu Xuewen1,2,3Lu Jiannan1

(1・Hubei Yangtze Gorges Landslide National Field,Scientific Observation Station,China Three Gorges Univ.,Yichang443002,China； 2.Geological Disaster&Ecological Environment in Three Gorges Area, Hubei Provincial Innovation Center,China Three Gorges Univ.,Yichang443002,China； 3.Hubei Geolog­ical Disaster Prevention Engineering Technology Research Center,China Three Gorges Univ.,Yichang 443002,China； 4.Yichang Municipal Yiling District Highway Bureau,Yichang443100,China)

Abstract The shear test is conducted by ring shear apparatus；the remolded specimens are obtained at the sliding zone of a landslide in the Three Gorges Reservoir area.The ring shear rate(0.05mm/min—10mm/ min)effect on the residual strength of silty clay is studied under different normal stresses(25kPa—300 kPa).The research results indicate that the residual strength decreases with the increase of shear rate and it is nonlinear under normal stress conditions,showing a significant negative rate effect・The negative rate effect is more significant at lower shear rate(<1mm/min)and higher normal stress(>100kPa).The residual strength is in a good logarithmic relationship with ring shear rate；and the empirical formula and general expression of the rate effect on remolded saturated silty clay are put forward.The research results provide reference for ring shear residual strength of saturated silty clay.

Keywords saturated silty clay；residual strength；shear rate effect；ring shear test

收稿日期：2018-05-16

基金项目：三峡库区地质灾害监测预警(科技部国家科技专项XKJ2017QT018)

通信作者：张国栋(1968-),男，教授•博士，主要研究方向为地质灾害减灾防灾.E-mail：zgd@