地铁建设中的环境岩土工程问题分析

Analysis on Environmental Geotechnical Problems in Subway Construction

地铁工程是一项建设规模大、工期长、投资多、社会效益倍受关注的工程。沈阳地铁工程穿过的地层主要为砂性地层,沿线地上穿越多个商业繁华区,地下管线密集,安全要求高,施工引起的环境岩土工程问题是地铁建设风险的重要组成部分。本文立足于沈阳地铁一号线工程,结合明挖法、盾构法、施工降水等主要施工工法和手段,分析了砂性地层中与地铁施工相关的支护结构变形、位移,流沙、管涌,因土体变形和沉降引起的地面、管线和相邻建筑物的沉降和破坏,以及与施工降水相关的土体固结和地下水环境的变化等环境岩土工程问题。

The Subway Project in Shenyang gets great attention with its large scale, long period, more investment and great social benefit. The engineering drilling covers most arenaceous stratum, many commerce sections and lots of underground pipes, which demands highly safety. Therefore, the environmental problems are very important in the subway construction over there. The paper, by taking route 1 of Shenyang Subway Project as an example and considering cut and cover method, shield tunneling and construction dewatering, analyzes the variation and displacement of the support, flowing sand, piping according to subway construction in arenceous stratum. Furthermore, this paper analyzes the settlement of the ground, pipes and adjacent buildings because of the soil variation and settlement, as weU as the soil concretion and the groundwater change with construction dewatering.