Research On The Construction And Monitoring Technology Of Subway Station Under Complex Geological Condition

With the continuous addition of high buildings and underground structure,the excavation is gradually developing to big depth,large area.Deep excavation which geological condition is complicated must be taken into the ground water,in order to ensure the reliability and economy of the project.Because of the alluvium and diluvium,foundation soil of Wuhan is distributed as typical binary structure,permeability coefficient between the horizontal direction and vertical direction exist difference.The issues,such an the extent of the effect of pensile curtain,relationship with precipitation,and influence of excavation on surrounding environment,when taking deep-well dewatering in the deep excavation in Wuhan city.On the basis of deep foundation dewatering engineering in Wuhan dispatch center of new passenger dedicated line.The paper study on the scheme of foundation pit waterproof curtain hanging under the condition of rainfall and the influence of precipitation on the surrounding environment of foundation pit.Details are as follows.(1)Design of dewatering scheme for foundation pit of Wuhan dispatching center.By checking the stability of foundation pit and analyzing the data of pumping test,get the curtain has benefits to the conclusion of foundation pit dewatering.(2)The influence of precipitation process on the surrounding environment is analyzed.The theoretical estimation and field test of rainfall influence radius of suspension curtain can effectively reduce the influence of precipitation radius.Analysis of foundation pit surrounding observation well water level changes found curtain can effectively reduce around the foundation pit water level lowering,improve the impact on the surrounding environment.According to analysis the deep dewatering design and key technology research with foundation pit of Wuhan dispatch center,show that,the suspension waterproof curtain can effectively improve the precipitation process of adverse effects,underthe similar geological conditions,deep and large foundation pit excavation provides the basis and it has important engineering value and practical significance.