临近深基坑地铁隧道沉降分析及应急保护研究

城市中大量的基坑工程施工,对地铁隧道的安全性产生了严重影响。文中以深圳地铁11号线红树湾站至后海站矿山法隧道为例,分析了临近深基坑开挖对隧道的影响,通过对地表沉降和拱顶沉降的监测数据分析,得到了沉降预警的原因,并提出了设置临时支撑、控制台阶长度、全断面注浆、控制性降水和优化土方开挖等应急保护措施,结果表明,应急保护措施可行、安全、有效,基坑及地铁隧道均在安全可控范围内。对同类工程具有借鉴意义。

STUDY AND ANALYSIS OF SETTLEMENTS OF SUBWAY TUNNEL NEAR DEEP FOUNDATION PIT CONSTRUCTION AND EMERGENCY PROTECTION MEASURES

The construction of a large number of foundation pit projects in the city has an seriousimpact on the safety of the subway tunnel. The article takes the Shenzhen subway line 11 in the Hongshuwan station to the Houhai station mine tunnel as an example,the influence of excavation of adjacent deep foundation pit on tunnel is analyzed, according to monitoring data of ground subsidence and the vault settlement, reasons for settlement early warning are obtained. Emergency protection measures such as setting temporary support, controlling step length, full section grouting, controlling precipitation and optimizing earthwork excavation are put forward. The results show that the emergency protection measures are feasible, safe and effective, and both the foundation pit and subway tunnel within the safe and controllable range. It can be used for reference for similar projects.