风荷载和列车共同作用下风积沙包芯路基边坡稳定性研究  

Slope stability coefficient calculation of aeolian sand core subgrade considering combined action of wind load and train load

作　　者：冷伍明[1,2] 周思危 阮波 聂如松[1,2] 袁立刚 门小雄[1] 董俊利 李家通 沈一凡 赵洋 LENG Wuming;ZHOU Siwei;RUAN Bo;NIE Rusong;YUAN Ligang;MEN Xiaoxiong;DONG Junli;LI Jiatong;SHEN Yifan;ZHAO Yang(School of Civil Engineering,Central South University,Changsha 410075,China;Key Laboratory of Heavy-haul Railway Engineering Structure,Ministry of Education,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]重载铁路工程结构教育部重点实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2024年第8期3179-3188,共10页Journal of Railway Science and Engineering

基　　金：中国铁路乌鲁木齐局集团有限公司科技研究开发计划课题(WLMQ-KGHZGS-HRTL-GGB-2020-0032);国家自然科学基金资助项目(51978672);中南大学自主探索研究生创新项目(2022zzts0629)。

摘　　要：我国是世界上沙漠分布最多的国家之一,沙漠中蕴藏着丰富的矿产资源。西部大开发和“一带一路”倡议将进一步推进沙漠地区铁路建设。利用丰富的沙漠风积沙作为铁路路基填料具有重要的经济意义和推广应用前景,风积沙包芯路基是一种充分利用风积沙作为铁路路堤填料的新型结构。为研究列车荷载和风荷载共同作用下风积沙包芯路基边坡稳定性计算方法,基于折线滑动法原理,对路堤结构进行分层分区,采用极限平衡方法,推导出列车荷载和沙漠风荷载共同作用下铁路风积沙包芯路基的稳定性系数计算公式并编制计算程序。结合和若铁路风积沙包芯路基的工程实例,验证了该计算方法的可行性。基于该计算程序,研究了风荷载大小、风向角、路堤填筑高度、填料内摩擦角等影响因素对风积沙包芯路基边坡稳定性系数的影响,分析了风向角、填料内摩擦角等影响因素对风积沙包芯路基边坡砂卵石封层最小厚度的影响。计算结果表明,风积沙包芯路基边坡稳定性系数与风荷载大小近似呈线性负相关,与风向角大小呈非线性正相关。风积沙包芯路基边坡稳定性系数富余量与路堤填筑高度呈负相关。风积沙包芯路基边坡砂卵石封层最小厚度与风向角大小呈非线性负相关,与风积沙填料的内摩擦角大小近似呈线性负相关。建议风积沙包芯路基边坡设计中应考虑风荷载的影响。研究成果可供沙漠地区风积沙包芯路基设计借鉴和采用。China is one of the countries with the most deserts in the world,and there are abundant mineral resources in the deserts.The western development and the Belt and Road initiative would further promote railway construction in desert areas.It is of great economic significance and application prospect to use abundant desert aeolian sand as railway embankment filler.Aeolian sand cored embankment is a novel structure that fully utilizes aeolian sand as railway embankment filler.Based on the principle of broken line sliding method,the embankment structure was layered and partitioned.The limit equilibrium method was used to derive the calculation formula of the slope stability coefficient(SC)of railway aeolian sand core roadbed under the combined action of train load and desert wind load,and the calculation program was compiled.The feasibility of the calculation method was verified by an engineering example of wind-blown sand cored subgrade in Heruo Railway.Based on the program,the influence of wind load,wind direction angle(WDA),embankment filling height and internal friction angle of filling material on the SC of Aeolian sand-cored subgrade slope were studied,and the influence of WDA and internal friction angle of filling material on the minimum thickness of sand pebble seal layer of aeolian sand-cored subgrade slope were analyzed.The calculation results show that the slope SC of wind-sandwich subgrade has a linear negative correlation with wind load and a nonlinear positive correlation with WDA.The surplus of slope SC of aeolian sand cored subgrade is negatively correlated with embankment filling height.The minimum thickness of sand pebble seal layer on the slope of roadbed with WDA is non-linear and negatively correlated with the internal friction angle of wind-blown sand filler approximately linear and the minimum thickness of sand pebble seal layer is negatively correlated with the WDA of wind-blown sand filler.It is suggested that the influence of wind load should be considered in the design of wind-blown sand cor

关 键 词：风积沙 包芯路基 风荷载 列车荷载 边坡稳定性分析 路基基床结构 

分 类 号：TU413.6[建筑科学—岩土工程]