地下过街道开挖施工地表沉降规律分析

Analysis of ground settlement laws for excavation of underpass across stress

城市地下过街道是充分利用地下空间、减少人车交通干扰、改善城市交通状况、减少交通事故的有效途径之一。本文利用有限单元分析方法,对地下过街道开挖施工地表沉降规律进行了计算模拟分析。结果表明:随着弹性模量的增加,地表沉降随之减小,地表反拱随之减小;随着泊松比的增大,沉降槽两侧地面的沉降逐渐增大;随着过街道宽度的增加,地表沉降也随之加大,沉降槽宽度增大;随着过街道埋深的增加,地表沉降随之减小,地表反拱逐渐增大,沉降槽宽逐渐减小。

Underpass across stress in city is one of the effective approaches for fully using underground space,reducing traffic disturb between people and vehicle,improving traffic condition,reducing traffic accident.In this article,the laws of ground settlement caused by excavation construction of underpass across stress were simulated using FEM.The results showed that the ground settlement and anti-arch decrease with modulus of elasticity increasing,the settlements on two sides of the settlement tanks increase with Poisson＇s ratio,the ground settlements and width of the settlement tanks increase with width of underpass across stress,the ground settlements and width of the settlement tanks decrease and the ground anti-arch increase with burial depth of underpass across stress increasing.