Analysis On Stress And Stability Of Pile-anchor Supporting Structure For Deep Foundation Pit

With the wide application of deep foundation pit engineering in engineering construction,the design issues related to deep foundation pit support engineering have become a common problem in the construction process of underground space utilization engineering and high-rise building engineering.The deep foundation pit support project needs to be considered from the perspective of satisfying the safety and stability of the foundation pit.The deep foundation pit support project needs to be designed reasonably and meet the requirements of the specifications.At the same time,the mutual influence between the surrounding buildings and the foundation pit must be considered.Therefore,it is of great theoretical significance and engineering application value for the theoretical study of deep foundation pit support engineering,analysis and research of the deep foundation pit support method technology,slope stability,slope internal force changes and main influencing factors.This article is based on the deep foundation pit project of a pumping station in Jinan City as the research object.According to the geological conditions of typical soil-rock combination in Jinan City,the deep foundation pit supporting scheme,the stress and stability of the supporting structure are studied.Combined with the field monitoring data,the supporting effect of the supporting structure is analyzed.The main contents and conclusions of the study are as follows.1.Design of supporting scheme and monitoring scheme for deep foundation pit of pumping station.Based on the site environment,engineering geological conditions and other factors,the selection of the deep foundation pit support scheme for the pumping station is made,and the monitoring scheme on the construction process is formulated.2.Calculation of pile-anchor support structure in deep foundation pit.According to the design scheme of pile-anchor supporting structure of deep foundation pit,the internal force of pile-anchor supporting structure is calculated by using classic soil mechanics theory and structural mechanics method.The surface settlement,overall stability,anti-uplift stability,etc.are checked and the parameters of the supporting structure are determined.3.Construction process simulation of deep foundation pit of pumping station based on MIDAS-GTS NX.The finite element software MIDAS-GTS NX is used to simulate the dynamic construction process of foundation pit excavation,the numerical calculation results in different construction stages are given,and the displacement changes of the soil around the foundation pit during the foundation pit excavation process are analyzed.By comparing the numerical simulation values of the foundation pit and the field monitoring values,the reliability of the numerical simulation results of the foundation pit supporting structure is verified.