某滑坡滑体土蠕变特性及长期强度研究  

Study on Creep Characteristics and Long-term Strength of Sliding-body Soil of a Landslide

作　　者：王体俊[1] 王大群[1] WANG Tijun;WANG Daqun(CCCC Second Highway Survey and Design Institute Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056

出　　处：《路基工程》2021年第5期70-74,共5页Subgrade Engineering

摘　　要：通过对西南地区雅砻江库区某滑坡的滑体土开展大型三轴蠕变试验,研究了其在不同围压和应力水平下的蠕变规律,并采用等时曲线法确定了长期强度。结果表明:滑体土的变形主要由三部分构成:瞬时变形、衰减变形和等速变形,前两者分别占总应变的55.0%和30.0%以上。滑体土的长期蠕变造成了其抗剪强度持续降低,与常规强度相比,长期黏聚力下降约19.4%,长期内摩擦角下降约23.7%。滑体土的蠕变特性对水库滑坡的变形具有重要影响。Through a large-scale triaxial creep test on the sliding-body soil of a landslide of Yalongjiang reservoir area in Southwest China,the creep law under different confining pressure and stress levels was studied,and the long-term strength was determined by the isochronous curve method.The results show that the deformation of sliding soil is mainly composed of three parts:instantaneous deformation,attenuation deformation and constant velocity deformation.The former two account for 55.0%and 30.0%of the total strain respectively.The long-term creep of sliding-body soil caused a continuous decrease of its shear strength.Compared with the conventional strength,the long-term cohesion decreased by about 19.4%,and the long-term internal friction angle decreased by about 23.7%.The creep characteristics of sliding-body soil have an important influence on the deformation of reservoir landslides.

关 键 词：滑体土 三轴试验 蠕变 等时曲线法 长期强度 

分 类 号：TU411[建筑科学—岩土工程]