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研究目的:城市地铁车站施工往往采取明挖法,对环境影响相对较大,因周边环境复杂,重要构造物、建筑物众多。武汉地铁2号线循礼门车站,22 m基坑开挖边界离轻轨桥墩最近仅1.25 m,而轻轨桥作为构筑物,需要满足轻轨运营的要求,对差异沉降极为敏感。因此,需对这一复杂环境下关键区段的施工进行监测与分析,提出解决方案。研究结论:武汉地铁2号线循礼门车站施工过程中,沉降监测数据相对较大,可能干扰紧邻轻轨的运营。本文通过分析基坑与轻轨桥墩的相对位置、土层分布等,调整优化了施工方案,增加了监测点,使相邻基坑的轻轨桥墩在进一步施工过程中,沉降趋于稳定,使轻轨桥墩的绝对沉降与差异沉降得到了控制。
Research purposes: The construction of metro stations in the city often adopts the method of open excavation, which has a relatively large impact on the environment. Due to the complex surrounding environment, there are many important structures and buildings. For Wuhan Metro Line 2 Xunlimen Station, the excavation boundary of 22 m foundation pit is only 1.25 m away from the light-rail piers. As a structure, the light-rail bridge needs to meet the requirements of light rail operation and is extremely sensitive to differential settlement. Therefore, we need to monitor and analyze the construction of key sections in this complex environment and propose solutions. Research conclusions: During the construction of Xunlimen Station on Wuhan Metro Line 2, the settlement monitoring data is relatively large, which may disturb the operation of the adjacent light rail. This paper adjusts and optimizes the construction scheme and increases the monitoring points by analyzing the relative positions of the foundation pit and the light rail piers, and the distribution of soil layers. During the further construction, the settlement of the light rail piers of the adjacent foundation pit tends to be stable, so that the light rail piers The absolute settlement and differential settlement have been controlled.