Application Research Of Suspended Wall Pile-bolt Support In Deep Foundation Pit Engineering

In recent years,with the continuous development of the country's urbanization and the birth of some international metropolis,the shortage of construction land.In the domestic building,the use of high-rise,super high-rise and underground space has become a trend.At the same time also greatly enhance the depth of excavation,even to thirty meters deep,excavation surrounding adjacent buildings or underground pipelines and underground large municipal underground engineering,the design and construction of foundation pit engineering more difficult.Therefore,the research on the mechanism and structure of deep foundation pit has become an important research topic in the field of geotechnical engineering.Pile anchor bracing of deep foundation pit support as an important form,with its disturbance on the surrounding environment,space saving and good supporting effect has become a city of deep foundation pit in the most commonly used form of support,at the same time,in recent years,with the development of numerical simulation technology,the numerical simulation method to is widely used in various fields.This article unifies the Ganzhou Hongqi village reconstruction project southwest side of deep foundation pit,according to the site conditions and geological data of deep excavation retaining scheme is designed,using Midas GTS NX finite element simulation software for deep foundation pit cantilever pile bolt supporting system is simulated by a single pile length,change pile spacing,anchor position,other conditions remain unchanged,the simulation results are obtained,and the simulation results were analyzed;and monitoring and analysis in the whole construction process.From the results of calculation,numerical simulation results and monitoring results,it can be concluded that the pile anchor support scheme is safe and reliable.By comparative analysis of the simulation results,when the pile up to a certain value,and then continue to increase the effect of pile length on foundation pit supporting effect is not obvious;the pile spacing changes in a certain range within a small,little difference between the supporting structure supporting effect,but more than the smaller,supporting the effect is quite different;multilayer bolting,lower anchor force will be significantly less than the upper anchor.According to the pile length,pile spacing,anchor pile and anchor position on the analysis of the influence of support scheme,can not affect the supporting effect of the premise,appropriate to reduce the pile length,the pile spacing increases,reduce the lower anchor length optimization of supporting scheme.