矩形顶管下穿对既有箱涵及地面的影响与分析

Impact and Analysis of Rectangular Pipe Jacking Underpassing on Existing Box Culverts and Ground

摘要:

某工程的地下人行通道，其截面形式为矩形，拟采用顶管法施工。该通道斜向下穿现状污水箱涵、污水管、雨水管。通过分析现状箱涵、管道与人行通道的位置关系、现场环境，并结合地质条件、施工条件，探讨研究合适的方案。采用数值仿真模拟计算以及理论分析，提出具体加固保护方案，以保障矩形通道在顶进施工期间，箱涵、地面沉降在正常使用允许范围以内。推荐选定的加固方案既可以保护现状箱涵、控制地面沉降在允许范围之内，又能做到工程费用节省，经济合理。

Abstract:

The pipe jacking method is proposed to construct an underground pedestrian channel of a project due to its rectangular cross-sectional form. The channel runs diagonally downward through the existing sewage box culvert, sewage pipe and rainwater pipe. A suitable scheme is discussed and studied by analyzing the positional relationship among the existing box culvert, pipeline and pedestrian passage, as well as the on-site environment, and combined with the geological and construction conditions. By employing the numerical simulation calculation and theoretical analysis, the detailed reinforcement protection scheme is put forward to ensure that during the jacking construction of the rectangular channel, the settlement of the box culvert and the ground remains within the allowable range for normal use. The recommended and selected reinforcement scheme can not only protect the existing box culvert and control the ground settlement within the allowable range, but also save the engineering cost, and be economical and reasonable.