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明挖隧道与在建南广高铁近似平行,铁路轨道距隧道基坑边线最近约20.5m,需考虑隧道施工对高铁的影响。首先综合各类规范及现有工程经验,确定安全影响评判标准;其次选取典型支护断面(距离近,基坑深,地质差),采用有限元法模拟隧道施工过程,分析在有无铁路荷载作用两种工况下隧道施工对邻近铁路路基的影响;最后,利用分析结果及评判标准,评价明挖隧道施工时铁路的安全状况。
The Ming tunnel is approximately parallel to the Jiannan-Guangzhou high-speed railway. The railway track is about 20.5m from the edge of the tunnel foundation pit, and the impact of tunnel construction on the high-speed railway should be considered. First of all, the standard of all kinds of norms and existing engineering experience are combined to determine the criteria of safety impact assessment. Secondly, the typical support section (near distance, deep foundation pit and poor geological conditions) is selected. The tunnel construction process is simulated by finite element method The effect of tunnel construction on the adjacent railway embankment under two conditions; and finally, the evaluation of the safety status of the railway during the construction of Ming-dug tunnel by using the analysis results and evaluation criteria.