顶管施工力学效应的数值模拟分析

3D NUMERICAL ANALYSIS ON CONSTRUCTION MECHANICS EFFECT OF PIPE-JACKING

近年来,在城市繁华以及跨越河流等地段,各类地下管道(隧道)采用顶管施工已显示出无比的优越性。随着市政建设的需要,顶管施工对周围环境的影响已引起人们足够的重视。为此,就顶管施工过程引起的力学效应进行了讨论。采用3D数值分析方法对机头正面推力、地层损失、注浆以及共同作用等进行模拟,旨在了解顶管施工引起的环境力学效应,为采取措施减小这种影响提供依据。

In recent years,pipe-jacking method is being used to construct various kinds of underground tubes or tunnels more popularly in urban area or when crossing river. Due to the development of municipal engineering,much more attention should be paid to the effect of pipe-jacking on closer environment. The construction mechanics effects of pipe-jacking with earth pressure balance are analyzed,for instance,the bulkhead pressure,stratum loss,and grouting. Then 3D FEM is employed to calculate additional stress of surrounding soil and surface deformation caused by excessive bulkhead pressure,stratum loss,grouting and their composite operation,respectively. The study illustrates the effect scope either in longitudinal or in transverse section caused by different elements of pipe-jacking,which can help researchers to understand the environment effect of construction in more detail. And at the same time,the quantitative results and some discussions can make for in-situ engineers to make decisions on their own for these effects in advance.