Research On Deformation Field Of Dynamic Consolidation With Drain Pile In Saturated Saline Soil Region

Saline soil grounds formed from flood or lake phased sediment are extensively distributed in Qaidam Basin,QingHai.The saline soil is characterized by high moisture content,strong corrosion,low shear strength and low permeability.Traditional foundation treatments such as gravel pile are hard to meet the requirements of constructions in QingHai.Dynamic consolidation with Drain Pile(DPD) is an efficacious foundation treatment for this kind of soil.Influencing factors of DPD are numerous and mechanism of DPD is complex,so the research group of DPD designed with and without drain pile in situ deformation test to research depth and range of influence of DPD.This thesis based on in situ deformation test,using kriging interpolation method to research the original data.The result show that normal conversed original deformation data can be used in kriging,The contours of kriging deformation field show that the vertical displacement addition of site without drain pile is obvious from first to fourth ramming,and unobvious from fifth to sixth ramming;wide ranging uplifted area occurs besides the ram,the reason of dynamic compaction failure is lack of efficacious drainage channels in soil;DPD has an outstanding drainage effect,there is no uplifted area found in soil,the main strengthening area of first to fifth ramming is surface soil and sixth to tenth ramming is deep soil.Builded a variable Permeability coefficient and elastic backbone element deformation energy model,analyzed the grid data of deformation field with this model.the result shows that statistical parameters of this model are interralted with diversifications of the deformation.Using the result we obtained the best ramming and the depth of influence.This thesis programmed kriging interpolation program suitable for dynamic compaction deformation field,which could draw approximate figure of deformation field.