特大暴雨条件下土质边坡人渗特征与微观结构试验研究

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中图分类号：TU43文献标识码：A

Experimental Study on Infiltration Characteristics and Microstructure of Soil Slopes Under Severe Heavy Rainfall Conditions

SU Cheng¹，DU Gong²，WANG Tianliang1，3*，KOU Xiaokang 1，3，4 ， QI Xiangyang1 （1.School of Civil Engineering，Shijiazhuang Railway University，Shijiazhuang，Hebei O5OO43，China;

2.Guoneng Shuohuang Railway Development Co.，，Ltd.，Yuaning Sub-company，Yuanping，Shanxi O3410，China;

3.KeyLaboratory of RoadandRailway Enginering Safety Guarante Jointly Establishedbythe Ministryof Education and the Ministry of Education， Shijiazhuang Railway University， Shijiazhuang，Hebei O5O043，China;

4.CNNC 3D Geographic Information Enginering Technology Research Center，Shijiazhuang，Hebei O50043，China）

Abstract：The permeability of the soil along the railway during rainfalldirectly affects the stability and safety of the railway embankment. To investigate the influence of diffrent regions and slopes，this study combined high-precision industrial CT microscopic equipment，three-dimensional reconstruction models， and on-site artificial rainfall simulation experiments to conduct in-depth analysis of the infiltration characteristics of soil slopes under extreme rain conditions and the microscopic properties of soil pores. The results show that during continuous rainfall，within the range of 5∘ to 50∘ slopes，the infiltration and water absorption capacity of the slope gradually decreases and then stabilizes; the porosity at the Shiheshou Tunnel is approximately 29% ，with larger sand particles，and the porosity in the Wen Tang Station area is approximately 19% ，with relatively smaller particle sizes.The soil at Shiheshou has a stronger permeability.From a microscopic perspective，under the same conditions，the larger the equivalent radius of pores and pore throats in the soil and the greater the coordination number，the largerthe soil permeability coefficient；the longer the pore length，the smaller the soil permeability coefficient.

Key words：rainfall test； microscopic test；permeability coefficient；CT scanning technology； pore structure

降雨时铁路沿线土质的渗透特性对铁路运输的稳定性和安全性至关重要。（剩余8076字）