矿山地下水变化对铁路设施稳定性影响研究

Study on the Influence of Mine Groundwater Change on the Stability of Railway Facilities

铁路是一种重要的民生工程,许多铁路建设需要穿越矿山,矿山开采引起矿区周边水位降低,造成地面沉降,对高速铁路的安全存在重大安全隐患。文章利用Dimine-Midas/Gts,建立了包含采空区、矿体、地表地形以及高速铁路关系的三维有限元数值模型,分析矿山开采、地下水位降低等因素,对高速铁路运营的安全影响。通过有限元数值模拟计算得出:矿山开采地下水位降低引起隧道中心线上部发生了较大位移沉降,最大竖向位移值2.33mm,超过了标准限值;矿山开采影响范围内隧道顶底板出现局部应力集中。结果表明矿山开采对高速铁路运营有一定的影响,研究成果可为矿山下一步开采提供科学的理论依据。

The railway is an important livelihood project,many railway constructions need to pass through mines,mining causes the water level around the mining area to decrease,resulting in ground subsidence,which poses a major safety hazard to the safety of high-speed railways.In this paper,Dimine-Midas/Gts,a three-dimensional finite element numerical model including goaf,ore body,surface topography and high-speed railway relationship is established to analyze the safety impact of mining and groundwater level reduction on high-speed railway operation.Through the finite element numerical simulation calculation,it is concluded that the decrease of underground water level in mining causes large displacement settlement in the upper part of tunnel centerline,and the maximum vertical displacement value is 2.33 mm,which exceeds the standard limit value.Local stress concentration appears in tunnel roof and floor within the mining influence area.The results show that mining has a certain influence on high-speed railway,and the research results can provide scientific theoretical basis for the next mining.