摘要
为研究渗流条件下或流固耦合作用下的偏压隧道扩建方式,以成渝高速中梁山宋家沟1号隧道为工程背景,针对渗流作用下既有浅埋偏压隧道的左侧小净距扩建、右侧小净距扩建、左侧原位扩建、右侧原位扩建4种扩建方式进行数值分析研究,分析各种扩建方式下的拱顶沉降、围岩收敛、围岩应力、初期支护内力、围岩孔隙水压力折减量等,通过与隧道扩建施工监测资料进行对比,发现数值模拟结果与施工监测极其吻合,验证了计算结果的可靠性。通过对4种扩建方式进行对比分析认为:1)采用小净距扩建时的围岩收敛变形、围岩竖向应力等均小于原位扩建;2)从针对地下水资源保护的角度出发,采用左侧小净距扩建时对地下水资源的保护效果明显优于其他3种扩挖方式;3)扩建隧道围岩孔隙水压力的折减在各个方向均呈现出明显的梯度变化,隧道施工过程中的涌水量大部分来自扩建隧道上部围岩。
In order to study the expansion method of shallow buried bias tunnel under the actions of seepage or fluid-solid coupling,taking Songjiagou No.1 Tunnel of Zhongliangshan in Chengdu-Chongqing High-speed as the engineering background,to the shallow buried bias tunnel under the seepage action,four kinds of the extension methods such as left side of small interval extension,right side of small interval extension,left side of in situ extension,right side of in situ extension are studied numerically.In these expansion methods,the factors such as vault subsidence,surrounding rock convergence,initial support internal force,pore water pressure reduction are analyzed.By comparing the monitoring data in tunnel expansion construction,it was found that the numerical simulation results are extremely consistent with the construction monitoring data,which proves the reliability of the calculation results.According to the comparative analysis of the four extension methods,it is concluded that:(1)By using the method of small interval extension,the factors such as surrounding rock convergence deformation,surrounding rock vertical stress and so on are all smaller than those of the in situ extension.(2)From the perspective of the groundwater resource protection,the protection effect by adopting the extension method of left side small interval is obviously better than the other three extension methods.(3)The pore water pressure reduction of surrounding rock shows obvious gradient change in all directions,and during the tunnel construction,the water surge mostly comes from the upper part of surrounding rock in extended tunnel.
作者
赖勇
张帅
LAI Yong;ZHANG Shuai(Hehai College,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《隧道建设（中英文）》
北大核心
2019年第S02期17-27,共11页
Tunnel Construction
关键词
浅埋偏压隧道
流固耦合作用
隧道扩建方式
数值分析
shallow buried bias tunnel
fluid-solid coupling
tunnel extension method
numerical analysis
