Analysis of the impact of shield construction tunnels under soft strata on the deformation of existing railroad roadbeds
In order to study the influence of the settlement of the upper railroad foundation caused by the shield tunnel construction under the soft ground,based on the Changchun Metro Line 2,a shield tunnel interval under the Changshuangyan Railway project,FLAC3D finite element soft-ware is used to simulate and study the settlement distribution of the railroad foundation under dif-ferent construction conditions,and analyze the influence of the settlement of the railroad founda-tion under the effect of soil bin pressure,grouting pressure and deep hole grouting reinforcement.The analysis results show that:the disturbance of the left line of shield construction on the rail-road roadbed is larger than the right line of shield construction;the settlement of the existing rail-road roadbed is not affected by the soil bin pressure,but decreases with the increase of grouting pressure;the maximum settlement of the railroad roadbed after the reinforcement with deep hole grouting meets the provisions of the"Rules for Repairing the Lines of General-Speed Railways".The analysis results can provide certain reference basis for the construction of shield structure un-der the railroad roadbed under the condition of soft stratum.
万方数据
维普
