Numerical Simulation Study on Fluid-Solid Coupling of Submerged Soil Arch Collapse
The red clay has poor permeability from top to bottom,making it difficult for suffusion-induced soil arch phenomena to occur naturally.The repeated rise and fall of groundwater enhance the erosion at the rock-soil interface,causing the clay minerals within the red clay to disintegrate upon contact with water.This easily leads to the formation of localized blocks,pro-moting the development of soil arches,disrupting the soil structure,and providing conditions for suffusion due to the instability of the internal structure,ultimately leading to the collapse of the suffusion-induced soil arches.To elucidate the development process of this collapse type,this study combines typical collapse incidents in recent years at Dongdiu,Libo,Qiannan.By utili-zing the Geo-Studio numerical simulation software,the study simplifies the groundwater erosion process as excavation to inves-tigate the process of red clay suffusion-induced collapse in the shallow buried cover layers in karst regions.The results indicate that groundwater erosion directly impacts the seepage field and stress field of the cover layer,leading to localized stress concen-tration and changes in the seepage field.During seepage,the reduction in effective stress results in an increase in localized dis-placement of the cover layer under its own gravity,accelerating the instability of the soil structure,and promoting the develop-ment of suffusion,ultimately leading to collapse.
万方数据
维普
