极浅埋富水砂层地铁横通道注浆加固与开挖稳定性  

Grouting reinforcement and excavation stability on super-shallow buried and water-rich sand stratum subway transverse channel

作　　者：夏梦然 李卫[2] 冯啸[2] 朱光轩 李夏[2] 

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055 [2]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《山东大学学报（工学版）》2017年第2期47-54,70,共9页Journal of Shandong University（Engineering Science）

摘　　要：针对极浅埋富水砂层地铁隧道横通道可能出现的施工安全问题,采用室内实验、理论分析及数值模拟的方法,对隧道进行注浆加固试验及开挖工法的优选,提出一套适用于浅埋富水砂层横通道的注浆加固工艺及开挖工法。认为注浆加固可有效提高砂层的物理力学参数和土体力学性能;支护时间越迟,围岩变形越大,预加固可有效提高围岩的物理力学参数,降低围岩变形,改善地层的应力—应变关系;对台阶法与CRD(交叉中隔墙法)法开挖后拱顶沉降、应力及塑性区分布特征进行了对比分析,通过现场开挖监测量控与数值分析的对比,验证了该工艺的可行性,该研究可为类似工程提供一定的借鉴和指导作用。Against the construction safety of super-shallow buried and water-rich subway transverse channel, laboratory experiments, theoretical analysis and numerical simulation were conducted to select the proper grouting parameter and excavation method, and a series of grouting and excavation method were put forward. Grouting reinforcement could ef- fectively improve the mechanical parameters of sand layer and mechanical properties of soil. The later the support time was, the greater deformation of surrounding rock would be. Pre-reinforcement could effectively improve the physical and mechanical parameters of surrounding rock, reduce the deformation of surrounding rock, and improve the stress- strain relationship. Vault settlement, stress and plastic zone distribution characteristics analysis of excavation step meth- od and CRD （Cross Diaphragm） method were compared, and feasibility of the method was determined. The research results could provide certain references to similar projects.

关 键 词：极浅埋富水砂层 暗挖法 注浆加固 开挖稳定性 数值模拟 

分 类 号：TD45[矿业工程—矿山机电]