基于实测地表位移的基坑开挖引起临近地下管线位移的计算

DISPLACEMENT CALCULATION OF NEARBY UNDERGROUND PIPELINE CAUSED BY DEEP EXCAVATION BASED ON FIELD TEST OF GROUND DISPLACEMENT

基坑开挖对临近地下管线的影响是目前关系到城市基坑能否安全、经济施工的一个重要问题,也已成为该领域的一个研究难点和热点课题。在前人提出的弹性地基梁理论的基础上,提出根据现场实测地表沉降曲线计算基坑开挖对引起临近地下管线位移的方法,弥补前人假定地下管线上方地表沉降曲线为抛物线的不足,从而使计算结果更加准确。最后通过一个工程实例,对该方法的求解过程进行说明,得出地下管线的竖向位移方程,并采用Matlab软件求出了其数值解,计算结果与实测值吻合良好。

Influence of foundation excavation on nearby underground pipeline is a key problem relating safe and economic construction of city foundation, which is a difficult and hot research subject. Based on the elastic foundation beam theory proposed by the predecessors, the calculation method based on field test ground subsidence curve of calculating the influence of deep excavation on nearby underground pipeline was proposed. This method made up the shortage of supposing the ground subsidence curve above underground pipeline to be parabola, which made the calculation result more accurate. Finally, the solution process of this method was illustrated through an engineering example. The vertical displacement equation of underground pipeline was obtained, and its value solution was solved with Matlab software, which was in good agreement with that of field test.