The Influence Analysis Of The Tunnel Underlying In Deep Foundation Pit In Reclamation Area

With the development of urban modernization in China,the demand for urban subway tunnel line is growing.The conflict of new construction and existing subway line appearsconstantly,which bring new problems to the construction inevitably.this problem of foundation pit excavation and the deformation of tunnel is investigated based on the general geological conditions or the case of a certain distance with the bottom of foundation pit,but a set of mature protection structure construction plan of subway is not formed.In this paper,the reclamation of Shen Zhen metro line 1 in big journey right direction subway project construction is taken as an example.In view of the reclamation area road building subway deep foundation pit construction construct system,the existing metro tunnel deformation effect of passing through the present the formation under the distance of only 0.59m is studied.This paper summarizes the relevant research results at home and abroad,and introduces the background engineering scale and engineering difficulties.In view of the foundation pit excavation,chose the reasonable foundation pit precipitation and supporting scheme,after the excavation construction of the subway protect ion system structure,function principle has made the analysis,to study the uplift piles,roots and the construction technology of anti-floating board,the results showed that on the reclamation of soil with high content of metro area,adopting DTH vertical,rotary drilling construction tree root pile and steel pipe pile significantly improves the construction efficiency,and reduces the engineering cost and the negative effect on the subway,and uplift pile and roots of construction and excavation using a small area of piecewise method have positive influence to subway.This article introduces in the excavation of foundation pit by using the method of intelligent monitoring and analysis of the monitoring data of the subway and combines with three-dimensional numerical model adopted by the simulation results,the deformation of metro tunnel were analyzed and summarized in this paper.The results show that the numerical simulation results and the monitoring results be consistent in overall deformation of metro tunnel,but deformation value differences.When the anti-floating plate continued construction completion of 21 m,effective control of maximum deformation range and after a single excavation,the addition of subway maximum deformation is half excavation length,and the eventually horizontal displacement value less than 0.3 mm and the same value of added and reduce.with the foundation pit excavation,subway obviously decreases the vertical and remains the same deformation range.