土岩深基坑开挖对临近管线变形影响分析

ANALYSIS OF THE EFFECTIVENESS OF DEEP FOUNDATION PIT EXCAVATION IN SOIL AND ROCK ON THE DEFORMATION OF ADJACENT PIPELINES

为探究土岩复合地层桩锚支护深基坑开挖对临近管线变形的影响,文中依托山东大学齐鲁医院二期项目的深基坑工程,通过Midas有限元模拟和现场监测相结合的方法,揭示了管线与基坑之间不同距离、管线周围不同土体对管线变形的影响。结果表明管线竖向变形呈凹槽形,在基坑端部-10~20m范围内不均匀变形最大;管线的位移与管线埋距负相关,在0.85H范围内影响较大;管周土体弹性模量的变化对其横向位移影响较大并且土体弹性模量越大,管线变形越小。研究成果可为类似工程提供参考。

This paper investigates the influence of pile-anchor supported deep foundation pit excavation in soil-rock composite stratum on the deformation of adjacent pipeline.Taking the deep foundation pit project of Shandong Uni-versity Qilu Hospital Phase II Project as the object,we reveals the influence of different distances between pipeline and foundation pit,and dfferent soils around the pipeline on the pipeline's deformation through the combination of Midas finite element simulation and on-site monitoring method.The results show that the vertical deformation of the pipeline is in the form of notch,and the uneven deformation is the largest in the range of-10~20 m at the end of the pit;the displacement of the pipeline is negatively correlated with the burying distance of the pipeline,and has a greater influence in the range of 0.85 H;the change of elasticity modulus of the soil around the pipeline has a greater influence on the transverse displacement of the pipeline,in which,the larger the elasticity modulus of the soil is,the smaller the deformation of the pipeline is.The research results may provide the reference for similar projects.