邻近建筑物盾构隧道开挖引起的地表沉降预测研究

发布时间：2019-07-15 08:32

【摘要】：城市地铁区间施工主要以盾构法为主,但盾构法施工会使周围一定范围内的既有建筑物受到影响。目前对邻近建筑物地铁隧道施工引起的地表沉降分布规律研究偏少,且Peck经验公式在预测沉降时忽略了建筑物的存在及其刚度的不同对沉降分布曲线的影响。文章通过分析盾构隧道开挖邻近建筑物时引起的土体变形规律,得出如下结论:当地表沉降分别呈"塞形分布曲线"、"偏态分布曲线"和"正态分布曲线"的变化时,隧道分别在位于建筑物正下方、扰动范围内以及扰动范围外的三种工况下进行施工,同时给出了"塞形分布曲线"和"偏态分布曲线"的计算公式及相关参数。通过分析算例验证盾构隧道开挖位于建筑物不同位置处引起的地表沉降呈"塞形曲线"、"偏态曲线"和"正态曲线"分布的合理性,可为邻近建筑物隧道施工及设计提供理论指导。
[Abstract]:The construction of urban subway section is mainly based on shield method, but the construction of shield method will affect the existing buildings in a certain range around it. At present, there is little research on the distribution of surface settlement caused by subway tunnel construction in adjacent buildings, and the Peck empirical formula ignores the influence of the existence of buildings and the difference of stiffness on the settlement distribution curve in predicting settlement. Based on the analysis of the deformation law of soil caused by shield tunnel excavation of adjacent buildings, this paper draws the following conclusions: when the surface settlement is changed by "plug distribution curve", "skewness distribution curve" and "normal distribution curve", the tunnel is constructed under three working conditions, which are located directly below the building, within the disturbance range and outside the disturbance range. At the same time, the calculation formulas and related parameters of "plug distribution curve" and "skewness distribution curve" are given. Through the analysis of an example, it is proved that the surface subsidence caused by shield tunnel excavation at different positions of the building is "plug curve", and the distribution of "skewness curve" and "normal curve" is reasonable, which can provide theoretical guidance for tunnel construction and design of adjacent buildings.
【作者单位】：浙江大学城市学院土木工程系;杭州地铁集团有限公司;
【分类号】：U455.43

【相似文献】