地下水对顶管结构内力计算的影响分析

Analysis on the Influence of Groundwater to the Internal Force Calculation of the Pipe Jacking Structure

地下水位高程变化时,作用在顶管上的相关荷载值标准值也在不断变化。本文在依据现行国家标准给出不同地下水位高程时顶管管道自重、管顶竖向土压力、管腔土荷载、管道侧向土压力和管道外水压力标准值计算算式的基础上,通过大量数据计算,分析不同地下水位高程时顶管结构内力值的变化趋势,并建议在顶管结构内力计算时应全面考虑地下水位高程的影响。

The standard value of relevant load acting on pipe jacking changes with the changing of groundwater level elevation.According to the current national standards,this paper presents the computing formula of pipe weight,the vertical soil pressure on the pipe top,the soil load in the pipe cavity,the lateral soil pressure of the pipe and the standard value of external water pressure of pipe under the influence of groundwater level elevation.Based on a large number of data calculation and analysis,this paper also put forward the changing trend of internal force of pipe jacking structure under different groundwater levels.Moreover,it was proposing that the influence of groundwater level elevation ought to be fully considered in the calculation of internal force of pipe jacking structure.