隧道岩体贯通节理面注浆加固力学响应特征  

Mechanical response characteristics of persistent joint planes in tunnel surrounding rock masses with grouting treatments

作　　者：王建圣 蒋志斌 李丽超 WANG Jiansheng;JIANG Zhibin;LI Lichao(Jiqing High Speed Railway Co.,Ltd.,Jinan 250100,Shandong,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,Shandong,China)

机构地区：[1]济青高速铁路有限公司,山东济南250100 [2]山东科技大学土木工程与建筑学院,山东青岛266590

出　　处：《隧道与地下工程灾害防治》2023年第2期80-88,共9页Hazard Control in Tunnelling and Underground Engineering

基　　金：山东省高等学校青年创新团队资助项目(2022KJ21);国家自然科学基金青年基金资助项目(52009076);山东省青年人才托举工程资助项目(SDAST2021qt06)。

摘　　要：为研究注浆加固对隧道岩体贯通节理面抗剪力学特性的影响,对非贯通节理岩体试样进行剪断破坏获得贯通节理面试样,开展注浆加固岩体直剪试验,研究注浆加固贯通节理面在直剪条件下的破坏特征及强度特性。研究结果表明:注浆加固后岩体的破坏模式分为胶结面滑移、完整岩石破裂和浆液固结体破裂三种,破坏模式主要受胶结面强度、浆液固结体强度和岩体强度的影响;水灰比主要影响水泥固结体的强度和胶结面的黏结强度,充填厚度主要影响胶结面的黏结强度;通过注浆加固显著提升了贯通节理面的黏聚力,而对内摩擦角几乎不产生影响;非贯通节理岩体的初始破坏会对贯通破裂面注浆加固效果产生影响,张拉断裂面的注浆加固后强度提升效果优于剪切断裂面.In order to study the influence of grouting reinforcement on the shear strength of the persistent joint planes,the nonpersistent jointed rock samples were sheared to be failed for preparing the persistent joint plane samples.The di-rect shear tests on grouting reinforced rock mass were carried out to explore the failure characteristics and mechanical properties of them.The results showed that the failure modes of rock mass after grouting treatments could be divided into three types:grouted plane shearing failure,intact rock material failure and grout consolidation failure.The failure modes were mainly affected by the strength of grouted plane,grout consolidation and rock material.The water cement ratio mainly affected the strength of the grout consolidation and the bond strength of the grouted surface.The filling thickness mainly affected the bonded strength of the grouted surface.Through grouting treatments,the cohesion of rock joint sur-face was significantly improved,while the internal friction angle was rarely affected.The initial failure of non-persistent jointed rock mass had an impact on the effect of grouting treatments.The strength improvement of grouting reinforce-ment on tension-induced failure planes was better than that on shear-induced ones.

关 键 词：隧道岩体 贯通节理面 注浆加固 直剪试验 破坏特征 

分 类 号：U43[交通运输工程—道路与铁道工程]