A Deep Foundation Of Hefei Subway Pile-anchor Combined Support Numerical Simulation And Onsite Monitoring

Nowsday, China’s economic development and city construction has accelerated,increasing the aerial and underground space planning and utilization. A variety oflarge and deep foundation pit engineering has become an indispensable part ofhigh-rise building.It has important influence that supporting structure on the stabilityof foundation pit engineering construction. In order to Hefei subway station deepfoundation pit project as an example, this paper carries on the following research andanalysis:This paper makes analysis and research on the deep foundation pit supportingtype and calculation of theoretical research, the deformation of retaining structure offoundation pit, foundation uplift, the settlement of surrounding ground and built(structure) of the building settlement effect of deep foundation pit deformation ofmain factors were studied, and the foundation pit support design scheme of rationality.system analysis.Combined with the actual situation of Hefei subway station deep foundation pitconstruction, the excavation and supporting structure of the3D numerical simulationusing FLAC3D software, obtaining the change law of foundation pit soil and retainingstructure internal force and displacement. The need to take into account theprestressed anchor cable and pile layout, anchor supporting parameters selection,retaining pile and anchor role in supporting structure and other factors, these factorsimpact on the safety and stability of the foundation pit structure of what kind of rulesare analyzed, and the corresponding control method.In the subway station deep foundation pit construction process, with the sitemonitoring and analysis. Through the field monitoring data and the analysis of theprestressed anchor cable internal force, horizontal displacement of retaining piles andthe variation regularity of the internal forces. Through carrying on monitoring dataand numerical simulation analysis of calculation, the simulation calculation and field monitoring data are basically consistent, it shows that the more objectively reflect theactual situation of the construction project.Pile anchor combined support compared with the cantilever retaining structureand the supporting structure has the unique advantages.At present,but it’s design andconstruction theory mainly rely on the experience of design and construction. AsHefei subway deep foundation pit project is the lack of design and constructionmethod, it can be referenceed.The results of this study can provide theoretical basis for Hefei area design andconstruction of similar deep foundation pit supporting structure, especially in thetheoretical calculation and important aspect of design rationality. It provides certainreference value in engineering.