地震作用下可液化地层诱发铁路路基灾变预测研究  

Disaster Prediction of Railway Subgrade Induced by Liquefiable Strata Under Earthquake

作　　者：司崇廷 贾国辉 原庆华 马超[1] SI Chongting;JIA Guohui;YUAN Qinghua;MA Chao(Key Laboratory of the Ministry of Education for Road and Railway Engineering Safety Assurance,Shiiiazhuang Tiedao University,Shiiazhuang 050043,China;China Railway 16th Bureau Group Railway Engineering Co.Ltd.,Guangzhou 510540,China)

机构地区：[1]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [2]中铁十六局集团铁运工程有限公司,广东广州510540

出　　处：《石家庄铁道大学学报（自然科学版）》2024年第3期55-61,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：中铁十六局集团公司科技研究开发计划(K2021-26C)。

摘　　要：为预测地震作用下铁路路基下方可液化地层的液化可能性及路基震后行车安全性,以安徽铜陵港江北港铁路专用线工程为依托,建立路基三维数值仿真模型,对地震作用下可液化地层的孔压比及道床顶面中心处变形的变化规律进行研究,分析地震烈度及可液化地层埋深对其液化可能性的影响,进而通过道床变形对路基震后行车安全性进行预测.研究发现,当可液化地层埋深小于5m且当地震烈度超过6度时,道床变形将危害路基震后行车安全性;当地震烈度超过7度时,由于可液化地层完全液化失去抗剪强度,路基有发生完全失稳的灾变风险.应在施工期对液化可能性较大的可液化土体进行抗液化处理.In order to predict the liquelaction possibility of the liquefiable strata below the railway subgrade under earthquake and the driving safety of the subgrade after earthquake,a three-dimensiona numerical simulation model of the subgrade was established based on the industrial railway project from Tongling Port to Jiangbei Port in Anhui Province.The change law of the pore pressure ratio of liquefi able strata and the deformation at the center of the top surlace of the ballast bed under earthquake were studied,the influence of the seismic intensity and the buried depth of the liquefiable strata on the lique faction possibility of the liquefiable strata were analyzed,and then the driving safety of the subgrade after earthquake was predicted.The study shows that when the buried depth of the liguefiable strata is less than 5 m and the seismic intensity is more than 6 degrees,the deformation of ballast bed will harm the driving safety of subgrade after earthquake:When the seismic intensity exceeds 7 degrees,the lique fiable strata lose its shear strength completely,and the subgrade has the risk of complete instability.Anti-liquelaction treatment should be carried out on liquefiable soil with high liquefaction possibility during construction period.

关 键 词：地震 可液化土 铁路路基 灾变预测 

分 类 号：TU435[建筑科学—岩土工程]