岩体软弱结构面剪切特性试验研究  

Experimental Study on Shear Characteristics of Weak Structural Surface of Rock Mass

作　　者：罗群[1] 王哲[1] 王俊杰[2,3] 赵天龙[2,3] LUO Qun;WANG Zhe;WANG Junjie;ZHAO Tianlong(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430074;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074;Diagnostic Technology on Health of Hydraulic Structures Engineering Research Center of Chongqing Education Commission of China,Chongqing Jiaotong University,Chongqing 400074)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430074 [2]重庆交通大学河海学院,重庆400074 [3]重庆交通大学水工建筑物监测诊断技术重庆市高校工程研究中心,重庆400074

出　　处：《公路交通技术》2021年第1期1-8,共8页Technology of Highway and Transport

基　　金：重庆市科委基础研究与前沿探索项目(cstc2018jcyjAX0084,cstc2018jcyjAX0391);水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK319006)。

摘　　要：针对含夹层材料的软弱结构面进行了大型室内剪切试验,以分析轴压条件及夹层材料含水率对结构面抗剪强度特征的影响。试验结果发现,轴压条件对结构面抗剪力峰值影响显著,但对峰值位移的影响不大,而夹层材料含水率对结构面抗剪强度影响规律与之相反。在以上试验基础上,选择软弱结构面直剪试验结果进行了结构面摩擦分量与粘聚分量的作用过程分析,发现剪切过程中,摩擦力的增长同结构面抗剪力合力增长规律较为类似,接近于理想弹塑性剪切过程,而粘聚力在剪切初期阶段存在先增长后减小的趋势,且随着轴压的增加,粘聚力损失的量值呈增大趋势。In order to analyze the influence of axial compression conditions and moisture content of interlayer material on shear strength characteristics of structural surface,a large-scale indoor shear test was carried out on weak structural surface containing interlayer material.Results show that the effect of axial compression conditions on peak value of anti-shear force is obvious,but it has little effect on the peak displacement,and influence law of moisture content of interlayer material on shear strength of the structural plane is opposite.Based on the test,the results of the direct shear test on the weak structural plane were selected to analyze the interaction process between frictional component and cohesive component of the structural plane.During shearing process,this shear process is close to that of ideal elastic-plastic,where the growth rule of the friction force tends to be similar to that of the resultant shear force.In the initial stage of shear,cohesive force grows first and then decreases.With the increase of the axial load,the loss of cohesive force increases.

关 键 词：软弱结构面 剪切强度 含水率 粘聚分量 

分 类 号：U416.1[交通运输工程—道路与铁道工程]