Numerical Simulation Of Super Vacuum Dewatering Method Based On FLAC3D

In this paper,the FLAC3 D finite difference software is used to simulate the foundation pit precipitation.Firstly,the precipitation model of ordinary well foundation pit is constructed,six ordinary wells is arranged in the foundation pit,when the depth of the well pipe is changed,the groundwater fall rate and the final stable water level in the foundation pit are studied.Then,construct the model of precipitation ditch super well point,divided into two types: homogeneous foundation pit precipitation model and homogeneous soil foundation pit precipitation model,first of all,homogeneous foundation pit precipitation model to study the effects of changes of the depth of well pipe of foundation pit dewatering effect and the pit outside of groundwater,including the impact range of groundwater and groundwater depth,etc.,through the comparison with the ordinary well point of the foundation pit precipitation,draw some conclusions,such as the efficiency of foundation pit dewatering and the influence of the external ground water,it is concluded that with the increase of the vacuum negative pressure in the wells,the efficiency of the foundation pit is increased,and it can reduce the influence of the foundation pit.Construction of heterogeneous foundation pit precipitation model,studied at the bottom of foundation pit aquifuge,common well precipitation and super well point dewatering of foundation pit in failure and no failure when the precipitation effect of aquifuge and influence on the groundwater level outside.It can be concluded that the water level is reduced to meet the requirements of construction and can greatly reduce the influence of the external groundwater level of foundation pit.In summary,the numerical model using FLAC3 D finite difference software construction of foundation pit precipitation,precipitation ditch super well simulation under various conditions.By contrast with common methods of foundation pit precipitation,analysis the super well point precipitation method for foundation pit dewatering,high efficiency,and can reduce the number of internal foundation pit dewatering well,especially the smaller impact on the external environment of foundation pit;super well point method on groundwater influence range of only ordinary methods about 1/3,the biggest drop underground water sealing curtain outside the deep well is only 6.3% of that of normal precipitation,and has a certain engineering significance of these conclusions have certain reference significance for the future research.