冻融条件下单裂隙注浆岩石破坏特性试验研究  

Experimental study on failure characteristics of single crack grouting rock under freezing and thawing conditions

作　　者：王博 张庆[1] WANG Bo;ZHANG Qing(School of civil engineering,Jilin Jianzhu university,Changchun 130118,China)

机构地区：[1]吉林建筑大学土木工程学院,长春130118

出　　处：《吉林建筑大学学报》2023年第5期17-24,共8页Journal of Jilin Jianzhu University

摘　　要：在冻融循环下,寒区岩体内的节理、裂隙和孔隙等缺陷会影响岩体结构稳定性,甚至使岩体工程发生冻融灾害.研究冻融循环下注浆固结体力学特性和破坏特征对完善岩体注浆加固理论、保障寒区工程安全实施具有重要的指导意义和应用价值.为研究冻融循环下注浆固结体试样的破坏特性,对预制单裂隙类岩石试样进行注浆加固得到注浆固结体试样,开展不同循环次数的冻融试验,对固结体试样进行单轴压缩和数字VIC-3D技术同步观测.结果表明,试样的破坏形式主要分为单斜面剪切破坏和拉伸破坏;在相同冻融循环次数下,随裂隙角度的增加,试样峰值强度增大,增幅在50%以上.在相同裂隙角度下,随循环次数的增加,试样峰值强度降低,降幅在35%以上;试样的应力-应变曲线大致分为4个阶段,即孔隙裂隙压密阶段、弹性变形阶段、裂纹发展阶段、破裂后阶段.Under freezing and thawing cycles,defects such as joints,cracks and pores in rock mass in cold regions will affect the structural stability of rock mass,and even cause freezing and thawing disasters in rock mass engineering.The study of the mechanical properties and failure characteristics of grouting consolidation under freeze-thaw cycles has important guiding significance and application value for improving the theory of rock mass grouting reinforcement and ensuring the safe implementation of engineering in cold regions.In order to study the failure characteristics of single fissure grouting rock under the freeze-thaw environment,the prefabricated single fissure of rock-like rock is grouted and reinforced,the saturated freeze-thaw test with different cycles is carried out on the grouted consolidated body,and the uniaxial compression test and synchronous VIC-3D observation are carried out on the frozen and thawed consolidated body samples.The test results show that:The failure modes of the sample are mainly divided into single slope shear failure and tensile failure;Under the same freezing and thawing times,the compressive strength of the sample increases with the increase of crack angle,with an increase of more than 50%.At the same crack angle,the compressive strength of the sample decreases with the increase of the number of freeze-thaw cycles,with a decrease of more than 35%;The stress-strain curve of the sample can be roughly divided into four stages:pore crack compaction stage,elastic deformation stage,crack development stage and post-fracture stage.

关 键 词：冻融循环 注浆固结体 单裂隙 单轴压缩 

分 类 号：TU312.3[建筑科学—结构工程]