摘要
广州地铁21号线长平站区间小净距并行隧道左右线施工时会多次扰动围岩,为避免形成围岩应力叠加,须确定合理的支护时机并尽量减少围岩变形。根据测点变形速率的变化,分析20m的开挖间距下测点的拱顶下沉、水平净空值,证明在V类围岩条件下,两条隧道的开挖间距为20m是可行的,但需注意采取措施控制沉降。
The surrounding rock will be disturbed many times during the construction of the left and right sides of the parallel tunnel with small net distance between the changping station area of guangzhou metro line 21. According to the change of deformation rate of the measured point, the vault settlement and horizontal clearance value of the measured point at the excavation interval of 20 m are analyzed, and it is proved that the excavation interval of the two tunnels is 20 m under the condition of v-type surrounding rock, but it is necessary to take measures to control the settlement.
作者
刘德乾
席书霞
申晓璐
LIU De-qian;XI Shu-xia;SHEN Xiao-lu(Hebei University of Engineering, 056038, Handan, Hebei, China)
出处
《建筑技术》
2019年第5期534-537,共4页
Architecture Technology
基金
河北工程大学与中铁十九局轨道公司合作项目(20160616)
关键词
小净距
并行隧道
开挖间距
small clearance
parallel tunneling
excavation spacing
