Monitoring And Numerical Simulation Of Deep Foundation Pit Support In Haikou

The pile anchor supporting system in deep foundation pit engineering is a form of supporting structure combination,which are frequently used with convenient construction,low noise,wide applicable scope,etc,in view of the pile anchor supporting design and construction is usually based on the traditional theory calculation,too much emphasis on safety factor is often neglected economic efficiency,caused the pile anchor supporting system cannot give full play to the supporting role,and the economic benefit is poor,especially in the short term the pile anchor supporting structure system,the economic waste.Therefore,it is necessary to pay equal attention to safety and economy in foundation pit engineering pile anchor support design.In addition,the engineering construction rhythm is have certain effect on deformation of supporting structure,to speed up the progress,often appear in the process of foundation pit engineering construction to the construction period and after the construction of the supporting pile phenomenon of rapid excavation,it bring certain challenges on the stability of foundation pit,the reasonable rhythm control excavation should be taken seriously.The pile anchor supporting system in deep foundation pit engineering is a form of supporting structure combination,which are frequently used at home and abroad in the review of the literature about the pile anchor supporting system of deep foundation pits,the research status of the pile anchor supporting system are analyzed and summarized,and a deep foundation pit in Haikou ofHainan province as an example,the collection of field monitoring data,the displacement of the pile anchor supporting system of soil settlement,the filling pile top horizontal and vertical displacement and supporting axial force of anchor rope change sorts through the data analysis,it is concluded that the actual law of supporting system of foundation pit displacement and settlement of surrounding soils,The variation of horizontal and vertical displacement and the change of anchor cable in different excavation phases are observed in different excavation stages.It is concluded that the safety coefficient of the anchor support design and construction scheme is high,but the overall scheme is conservative and needs to be improved in economy.In this paper,based on the use of FLAC3 D finite difference software shipped from running,cable and beam structure unit and strain hardening/softening constitutive model for the design of the fifth section of the numerical simulation on excavation support of foundation pit slope analysis,get the soil displacement and settlement law of supporting pile stress deformation law of supporting anchor axial force and displacement variation law.By comparing the numerical simulation results with the field measured data,summarize the pile anchor supporting system of soils and displacement deformation law of pile anchor,proved that the strain hardening/softening constitutive model applicability in this project,and on the basis of the design scheme is optimized.