盾构下穿建筑物变形分析与控制措施——以济南地铁4号线隧道为例

随着我国地铁的大力建设，其施工过程也受到越来越多复杂因素的影响，因此需要掌握每种因素的影响规律，并针对不同工况研究不同的加固措施。以济南轨道交通4号线邢村站至唐冶南站区间盾构施工为工程背景，利用ABAQUS有限元软件构建三维数值计算模型，分别对盾构隧道正下方穿越建筑物与侧下方穿越建筑物进行分析，并采取不同的加固措施进行研究。结果表明：在盾构隧道开挖正下方穿越建筑物的情况下，对于地表以及建筑物基础的沉降差，采用基础下注浆加固控制效果约为24%，隔离桩加固控制效果约为15%，拱顶注浆加固控制效果约为47%，拱顶注浆加固控制效果最好，但采用隔离桩加固控制效果较差，因此在正穿时不建议采用；在盾构隧道开挖侧下方穿越建筑物的情况下，对于地表以及建筑物基础的沉降差，采用基础下注浆加固控制效果约为24%，隔离桩加固控制效果约为33%，拱顶注浆加固控制效果约为49%，拱顶注浆加固控制效果最好，隔离桩次之，基础下注浆加固控制效果较差。

Deformation Analysis and Control Measures of Shield Tunneling through Upper Buildings：Taking Jinan Rail Transit Line 4 Tunnel as an Example

With the vigorous construction of subway in our country, the construction process is affected by more and more complex factors. Therefore, it is necessary to master the influence of each factor, and study different reinforcement measures in different working conditions.Taking the shield construction from Xingcun Station to Tangye South Station of Jinan Rail Transit Line 4 as the engineering background. The finite element software ABAQUS was used to build a three-dimensional numerical calculation model, and the shield tunnel directly under the building and side under the building were analyzed, and different reinforcement measures were taken to study. The research results show that in the case of shield tunnel excavation directly under the building, for the settlement difference between the surface and the building foundation, the control effect of grouting under the foundation is about 24%, the control effect of isolation pile is about 15%, and the control effect of grouting on the vault is about 47%. The control effect of grouting on the vault is the best, but the control effect of grouting on the vault is poor. Therefore, it is not recommended to use when wearing. For the settlement difference between the ground and the building foundation under the excavation side of the shield tunnel, the control effect of grouting under the foundation is about 24%, the control effect of isolation pile is about 33%, and the control effect of grouting on the vault is about 49%. The control effect of grouting on the vault is the best, followed by isolation pile. The control effect of grouting reinforcement under foundation is poor.