宁波城市轨道盾构法施工对周围岩土环境变位的影响规律研究

发布时间：2018-03-12 09:46

本文选题：盾构法施工　切入点：沉降　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：隧道盾构法是城市轨道交通施工中重要的施工方法，，它相比其他隧道开挖方法有稳定性好、对地面影响相对较小的优点，但利用盾构法施工时仍然会对隧道周围的土体不可避免地有一些扰动，引起隧道周围土层环境发生变化。本文对宁波市轨道交通一二号线典型区间地表沉降观测数据进行统计分析，总结了宁波特有的软土环境下轨道交通盾构开挖地表横向和纵向沉降发展规律。对选定区间进行盾构开挖时土体深层沉降和水平位移监测，整理相关数据进行分析，确定了盾构开挖深层影响规律和三维影响范围。对典型区间实测地表沉降曲线进行拟合，得出了宁波轨道交通隧道盾构施工时的横向和纵向沉降预测公式，并与典型peck公式和Sagaseta纵向沉降公式结果进行了对比，对比的结果说明本文提出的沉降预测公式对宁波轨道交通工程更加准确适用。利用ANSYS建立DP模型对宁波轨道交通盾构开挖进行了数值模拟，把模拟的结果数据与实测结果数据对比，进一步分析盾构开挖对周围环境的影响规律，确认ANSYS数值模拟的有效性，同时也确定了不同土质环境下模型参数的取值范围。
[Abstract]:The shield tunneling method is an important construction method in the construction of urban rail transit. Compared with other tunnel excavation methods, it has the advantages of better stability and less influence on the ground. However, there will still be some disturbance to the soil around the tunnel when the shield method is used, which will cause the change of the soil layer around the tunnel. In this paper, the surface subsidence observation data of typical section of Ningbo rail transit line 1 and 2 are statistically analyzed. This paper summarizes the development law of horizontal and longitudinal ground subsidence in shield excavation of rail transit under the unique soft soil environment in Ningbo. The deep settlement and horizontal displacement of soil are monitored during shield excavation in selected section, and the relevant data are analyzed. The deep influence law and three dimensional influence range of shield excavation are determined. By fitting the measured surface settlement curve of typical section, the prediction formulas of transverse and longitudinal settlement during shield tunneling construction of Ningbo rail transit tunnel are obtained, and the results are compared with those of typical peck formula and Sagaseta longitudinal settlement formula. The results show that the settlement prediction formula proposed in this paper is more accurate and applicable to Ningbo rail transit project. The numerical simulation of shield tunneling in Ningbo rail transit is carried out by using DP model established by ANSYS. Comparing the simulated data with the measured data, the influence of shield excavation on the surrounding environment is further analyzed. The validity of ANSYS numerical simulation is confirmed, and the range of model parameters under different soil conditions is also determined.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU433;U455.43

【参考文献】