The Analysis Of Deformation Laws Of Deep Foundation Pit And Its Design Considering The Influence Of Existing Railway

With the rapid development of Chinese economy,the construction of high-speed rail in China has sprung up,many engineering accidents have also occurred along the way.The accidents of foundation pits caused by the supporting structure problems are also unstoppable.Foundation pit engineering is an ancient and bear the imprint of the times of geotechnical engineering subject,according to different engineering geological conditions to design a safe,reliable and economical foundation pit supporting plan is one of the many experts and scholars are studying the subject.as the scale of the foundation pit engineering is more and more big,the surrounding environment is more and more complex,the construction space is getting smaller,that lead to design and construction of deep foundation pit engineering is more and more difficult.How to choose a safe,economical,With the development of deep foundation pit engineering,the rational selection and optimization design of foundation pit support plan are more and more demanding.Excavation and supporting of foundation pit engineering involves with geotechnical engineering,structural engineering and drainage engineering,etc.,which is such a comprehensive discipline.It is crucial to make sure the foundation pit support system is stable and deformation of Deep foundation pit meets the requirements of the surrounding environment before making reasonable design of foundation pit supporting,which includes selecting,and optimizating the plan of foundation pit support,structure design of foundation pit supporting and construction process.Solving the above problems is of great practical significance,and which is a scientific precondition and fundamental guarantee to ensure the safety,economy and scientific of construction.Taking the foundation pit support project of bridge cap in a province as an example,this paper selects the suitable foundation pit support plan according to the surrounding environment and soil quality,that combined with previous engineering experience.the software of the deep foundation pit is used to check the foundation pit support plan,it checked respectively from the aspects of anti-overturning stability and settlement.The results meet there of the relevant specifications,and verify the rationality of the design.Finally,ABAQUS software is used to simulate the whole excavation and support process.The software is used to analyze the deformation law of steel sheet pile and surrounding soil during excavation and support of foundation pit.The above results are compared and analyzed,It is proved that the supporting structure of the deep foundation pit is stableduring the excavation.It provides relevant experience for solving similar engineering problems in the future.