浅埋暗挖隧道下穿建筑物的风险控制研究

STUDY ON RISK CONTROL DURING EXCAVATION OF SHALLOW TUNNELS BENEATH GROUND BUILDINGS

浅埋暗挖隧道下穿建筑物往往引起建筑物沉降变形,对既有线路和周边建筑物的安全产生威胁。以青岛地铁一期工程某区间隧道下穿高层建筑物为背景,针对施工中存在的渗漏水及沉降变形过大等问题,开展数值模拟与现场监测相结合的研究工作。根据有限元计算确定施工对建筑物的影响范围,进而确定合理的注浆加固方案。研究结果表明采用深孔注浆、径向注浆等堵水措施,结合袖阀管注浆对建筑物变形进行控制,可保证隧道上方建筑物的安全。

Shallow tunnels excavated undemeath surface buildings often cause ground settlements and structure deformation which bring threats to structural safety. To solve the problems such as water seepage and excessive settlements encountered in the excavation of a certain regional tunnel below ground structures in the first stage construction of Qingdao subway project, this paper conducted numerical simulation on the basis of field monitoring data. Numerical calculation has revealed the range of influence to the buildings from underground construction. A proper scheme of grouting was determined according the results of numerical simulation. Research in this paper showed that the adoption of deep-hole grouting and radial grouting combined with sleeve-valve-pipe grouting were of great positive effect to ensure the safety of buildings above tunnels.