采动区扰动土-结构界面剪切特性的试验研究  

Experimental study on shear characteristics of disturbed soil-structure interface within mining subsidence areas

作　　者：常虹[1,2] 夏军武[1,2] 孔伟[3] 郑培波[1] 唐晓祥[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,江苏徐州221116 [2]江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221116 [3]中国矿业大学审计处,江苏徐州221116

出　　处：《中国矿业大学学报》2013年第4期535-539,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51274192);江苏省土木工程环境灾变与结构可靠性重点实验室开放基金项目(JSKL2012YB03);江苏省高校优势学科建设工程

摘　　要：基于采动区扰动土的变化规律,设计了不同初始孔隙比和初始饱和度的土样,模拟采动过程中土体物理性质的变化.采用DRS-1型高压直剪试验系统完成了扰动土与结构材料界面的直剪试验,分析了法向应力、初始孔隙比以及初始饱和度对界面剪切特性的影响.结果表明:界面剪切强度与法向应力、土样的初始孔隙比及初始饱和度密切相关.界面剪切强度与法向应力成线性关系,随法向应力的增大而增大;初始孔隙比对界面剪切强度的影响随着法向应力的增大趋于显著,界面剪切强度随着初始孔隙比的增加先增大后减小,存在峰值;初始饱和度对界面剪切强度的影响也随着法向应力的增大趋于显著,相同初始孔隙比的情况下,随着初始饱和度的增加,界面剪切强度逐渐降低.Based on the variation principles of disturbed soil in mining subsidence areas,a series of soil-structure shear tests were performed by a DRS-1 high stress direct shear experiment system.The shear characteristics of the soil-structure interface were systematically studied.The influences of normal stress,initial porosity ratio and initial saturation for interface were analyzed.The results show that the shear characteristics of the interface are closely related with normal stress,initial porosity ratio and initial saturation.The shear strength of the interface is linearly related to normal stress and increases with normal stress;under smaller normal stress,the effect of initial porosity ratio and initial saturation for the shear strength is not distinct.Under larger normal stress,the shear strength reaches a peak with the initial porosity ratio and decreases with the increasing of initial saturation.

关 键 词：采动区 土-结构界面 直剪试验 初始孔隙比 初始饱和度 

分 类 号：TD324[矿业工程—矿井建设]