Study On Stability Control And Engineering Application Of Soil Nailing Support In Yongwei Lanxiting Foundation Pit Project

Since the 21st century,the pace of urbanization in our country has been striding forward with great strides.However,with the progress of urbanization,the development of underground space in urban development space has become more and more important.The excavation of deep foundation pit in the expansion of underground space is also developing rapidly.Faced with the expansion of large underground space and the current situation of deep foundation pit excavation,the supporting structure of foundation pit excavation is very important.The requirements of the system will be further improved to meet the requirements of stability,strength and stiffness at the same time.Because of the complexity of foundation pit excavation,it is often interrelated with regional,hydrogeological conditions,construction environment and complex factors of foundation pit,so there are still some hidden dangers of safety accidents in the process of foundation pit excavation in practical engineering experience.How to minimize the accidents of foundation pit excavation in engineering examples has become the focus and heat of the current civil industry.Point.Taking Lanxiting Bid Section 1 project in Yongwei as an example,this paper analyzed the development background,construction theory and current development status of foundation pit construction.Starting from the design principle of supporting structure,this paper compared and expounded the cement-soil mixing pile supporting system,row pile supporting system,internal supporting system,pull-anchor supporting system,diaphragm wall supporting system and soil nailing wall supporting system.According to the characteristics of the retaining system,the selection of the retaining system for foundation pit is carried out,and then several influencing factors of the soil nailing support,such as the length,aperture,spacing,density,inclination and location of the soil nailing,are analyzed and compared in depth.Combining with the geological and hydrological conditions of the actual project,the layout mode of the soil nailing support is designed.On the basis of the layout mode,the excavation cross section of the foundation pit is expanded.The stability analysis of excavation process is carried out,the construction technology of foundation pit engineering is studied and discussed,and the complete construction safeguard measures are put forward for the wholeproject construction.The whole research is compact,complete and practical,which provides a learning reference for future related engineering construction.