Design And Numerical Simulation Of Deep Foundation Pit Support Of A Subway In Hangzhou

In recent years,the city subway construction in China like a raging fire,it is import ant to research the safety of deep excavation engineering and the adjoint numerical simu lation software,now used for subway construction plays a direct role in guiding,combin ing with the Hangzhou City Metro Line Five station engineering example,based on the summary of previous research deep excavation of metro,through the software to calcula te and determine the reasonable supporting plan of deep excavation,checking of the sup port scheme of foundation pit and numerical part of the use of the current widely used si mulation software PLAXIS 3D to simulate the process of construction of deep foundatio n pit excavation.In this paper,according to the results of the final numerical simulation,the design,simulation and monitoring values are compared:(1)according to the general situation of the project of Hangzhou subway station and the engineering geology of the area,the supporting structure of the deep foundation pit is designed and analyzed by using the calculation software of the foundation pit.According to the results of the design,construction and construction,during the construction in strict accordance with the standards of monitoring,monitoring results show that the design value of contrast can meet the requirements of the foundation pit deformation,shows that the retaining structure design is reasonable and feasible;(2)according to the Hangzhou city station deep foundation pit supporting engineering as an example,using PLAXIS 3D model to simulate and analyze the process of the excavation of deep foundation pit,the distribution and the change rule of displacement,the deep foundation settlement and axial force;(3)the value of the numerical simulation is compared with the actual monitoring data,and the results are basically the same,which proves the correctness of the numerical simulation of the foundation pit project design;PLAXIS 2D/3D program is now widely used in all kinds of complex finite element analysis in geotechnical engineering project,and numerical simulation of this method has the advantages of convenient,clear concept,strong operability and do not need to spend a lot of money,now has become a mainstream trend,the future will be more development and application.Based on this the result also provides a certain reference value for the same type of deep foundation pit excavation.