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.
出处
《山东大学学报（工学版）》
CAS
北大核心
2017年第2期47-54,70,共9页
Journal of Shandong University（Engineering Science）
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
super-shallow buried and water-rich sand stratum
undercutting method
grouting reinforcement
excava-tion stability
numerical simulation
