城际铁路与高速公路十字交叉路堑边坡病害治理与稳定性分析

Disease control and stability analysis of cutting slope in intercity railway and highway crossing position

某城际铁路与高速公路81°角度十字交叉,公路下穿铁路,基本同步建设,公路边坡失稳产生的牵引滑动影响城际铁路安全。分析了边坡失稳机理,提出了采用抗滑桩+锚索的边坡加固措施,并用数值模拟研究了加固前后的应力应变状态及安全系数,为边坡加固治理提供了理论依据。研究结论显示:边坡病害形成主要为持续降水使土体软化,局部坍塌形成山腰裂缝,雨水沿裂缝下渗加速了坡体破环;原边坡天然工况安全系数为1.10,极易在降雨等因素下失稳破坏,边坡加固后安全系数为2.80,处于稳定状态。

The highway crosses an intercity railway at an angle of 81°,and the two are constructed synchronously,the traction sliding of highway slope affects the safety of intercity railway.In this paper,the mechanism of slope instability is analyzed,and the reinforcement measures of anti-slide pile and anchor cable are proposed,the stress-strain state and safety factor before and after reinforcement are studied by numerical simulation,which provides a theoretical basis for slope treatment.The research conclusions are as follows:the reason of slope disease is that continuous rainfall softens the soil,local collapse forms hillside cracks,and the infiltration of rainwater along the cracks accelerates the broken ring of the slope;the safety factor of the original slope is 1.10 under natural conditions,which will be destroyed under rainfall and other factors,the safety factor after reinforcement is 2.80,which is in a stable state.