FEM Analysis On Grillage Flexible Supporting Structure With Prestressed Anchors Under Raining

Frame flexible supporting structure with prestressed anchors can sufficiently adjust and improve the soil itself strength and stability.Therefore,it has been widely used in deep foundation execavation and slope reinforcement engineering.Then foundation and slope usually destroys for luring condition,especially for the influence of the rainfall infiltration;So that,the study about the influence of the rainfall infiltration to the slope stability and supporting structure is becoming an important part of the study on slope reinforcement engineering.Due to the complicate slope soils,the influence of rainfall infiltration to slope stability and internal force of supporting structure is complicated.Now there are no comprehensive study on this subject.In this paper,first based on a large quantity of the slope supporting,rainfall infiltration and the saturated-unsaturated theories,in order to further recognize the influence of rainfall infiltration to slope stability and internal force of supporting structure and works together,slope and support and earth are seen as a body to study,aimed at frame flexible supporting structure with prestressed anchors to analyze and find rainfall has effects on itself internal force. Secondly,combined with the project of a deep cutting slope engineering of Luoding freeway at the 16th section of contracts at Dinxi area,based on FEM(MIDAS), analyze the influence of rainfall time and seepage variations to slope variations of stability coefficient of slope stability and pore water pressure of the seepage field, result in increasing of pore water pressure and decreasing of the variations of safety coefficient of slope stability as rainfall time lasts and seepage variations increases gradually.Finallly,combined with the project of a deep cutting slope engineering of Luoding freeway at the 16th section of contracts at Dinxi area,The finite element 3D model has been formed and analyze influence of rainfall time and seepage variations to internal force of supporting structures and deformation,displacement of soil behind wall,earth pressure,result in increasing internal force of supporting structures and deformation,displacement of soil as rainfall time lasts and seepage variations increases gradually.