减小浅埋暗挖法施工对建构筑物影响的措施

地铁隧道施工过程中,由于施工产生扰动,必然会破坏岩土体原有的应力平衡状态,从而产生一系列与岩土工程环境有关的问题,如土层位移以及由此产生的地面建筑物、地下管线及桩基等建构筑物的破坏等。在城市环境条件下的第四纪地层中进行浅埋暗挖,更加严格要求土层位移必须控制在允许范围之内,以达到环境土工的安全使用。笔者重点针对地层沉降的组成及控制建筑物受开挖产生的影响,总结实践经验,给出了控制开挖产生沉降的多种方法,同时提出隔离措施,具有一定的使用价值和工程施工指导意义。

Measures Reducing the Effects on Structure by Underground Cutting with Shallow Overburden

When tunneling,the disturbance induced by construction necessarily destroys the intrinsic stress balance of geotechnical material followed by a serial of problems about geotechnical environment,such as soil movement inducing the damages of the ground buildings,underground pipelines and pile foundations etc.In the fourth age stratum of cities,underground cutting with shallow overburden much more strictly require that soil movement must be controlled at the permitted range for the security of the structure.The component of the ground settlement and controlling the influence on the structure subjected to are the key points.By summing up the experience,the means controlling the settlement produced by excavation and the isolation measures are provided.All the measures are useful and significant in construction guidance.