境外铁路路基软岩边坡整治实例分析

Landslide analysis of soft rock slope for oversea railway subgrade

为合理地对境外铁路路基边坡进行整治,对尼日利亚拉伊铁路部分区段路堑边坡的溜坍原因进行分析,重点阐释雨水及施工工艺等因素导致边坡溜坍时所采取的临时防护措施。同时,借助岩土分析软件GEO-STUDIO中的SLOPE/W与SEEP/W模块,构建降雨条件下的境外铁路路基边坡数值模型,采用施工现场所取土样的基本物理力学指标作为模型参数,结合境外铁路特点与边坡稳定性计算结果,提出合理可行的路基边坡整治措施,并对整治后的边坡进行监测。研究结果表明:整治方案有效地解决了路基边坡溜坍病害对线路稳定和铁路行车安全的影响,对海外同类型工程具有一定的借鉴作用。

When the railway subgrade slope collapses in the overseas railway project,due to engineering background,construction technology,exploration environment and other factors,there are certain differences between the remediation methods and the domestic ones.In order to rationally rectify the slope of the overseas railway subgrade,this paper analyzed the reasons for the slippery slope of the section of the Rai Railway in Nigeria,focusing on the slope in the rainy season and the construction process and temporary protective measures taken at the time.Further,with the SLOPE/W and SEEP/W module in the geotechnical analysis software GEO-STUDIO,the numerical model of the overseas railway subgrade slope under rainfall conditions was constructed.The mode parameters were derived from the basic physical and mechanical indexes of the soil samples taken at the construction site.Combined with the characteristics of overseas railways and the calculation results of slope stability,a reasonable and feasible subgrade slope treatment measures were proposed.Through the monitoring of the slope after rectification,the results show that the remediation plan effectively solves the impact of roadbed slope slipping disease on line stability and railway traffic safety,and has certain reference for overseas similar projects.