The Subway Deep Foundation Pit Monitoring An Numerical Simulation Of The Secondary Excavation Method Research

With the rapid development of the city, the underground spaces were increasinglyused. But due to the large population and the narrow urban land, the difficulty of theconstruction of subway station deep excavation was growing. the complexity of theexcavation resulted in many uncertainties of design and construction which wouldbrought economic losses and severe engineering accidents. In recent years a numberof deep excavation instability collapse have been witnessed over the country. Thus,when dangerous situation in the course of Metro deep excavation constructionappeared. it is essential to, the rescues and reinforcements for the first time and theanalysis of the status quo and re-dug pit to guide subsequent excavation constructionwere very meaningful and essential.Seted against engineering backdrop of Wuhan Metro Line II Fuxing Road station.This paper is by combining monitoring with finite element numerical simulation, onthe subway dig deep excavation complex issues related to in-depth research. Themain contents are as follows:(1)Summarize the subway deep excavation monitoring technology.Combiningthe hydrogeological conditions and building envelope solutions on the Fuxing Roadstation, design construction monitoring program. By monitoring the construction ofretaining structure and the support shaft deformation force value after the stationbefore digging reinforced focus on complex analysis, to prepare for the re-dug.(2)Use PLAXIS finite element software, using the finite element model of theprocess of the plane Fuxing Road station complex were simulated Calculateddeformation, internal forces and the amount of upheaval in the bottom of eachcondition supporting structure.(3)The results of PLAXIS software simulation calculating compare with the dataof complex process of digging monitoring analyzed,the result obtained by the two methods in the trend is the same. However, due to multiple factors influence theactual project,there are differences between the two data. Therefore, when the subwaydig deep pit.finite element simulation method can be used to identify the dangerpoint in the complex process of digging,advance control,monitore the safety ofexcavation by real-time control,two approaches together to ensure the safety complexdug pit.