Slope stability coefficient calculation of aeolian sand core subgrade considering combined action of wind load and train load
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 cored subgrade slope. The research results can be used for reference and utilization in the design of aeolian sand cored subgrade in desert area.
aeolian sandcore-subgradewind loadtrain loadslope stability analysisstructure of subgrade bed
万方数据
维普
