Selection And Monitoring Of Deep Foundation Pit Supporting Structure For Utility Tunnel In Complex Environment

Due to the high efficiency and modular utilization of underground space,urban comprehensive pipe corridors have been actively promoted and constructed in large and medium-sized cities in my country.The construction of comprehensive pipe gallery foundation pits is usually carried out in complex environments,such as complex underground pipelines,adjacent structures and roads,which increase the requirements for the selection and use of foundation pit supporting structures.This article summarizes the main types of foundation pit support and deformation forms of foundation pits on the basis of reviewing the related research status of comprehensive pipeline gallery foundation pits.Taking the deep foundation pit engineering of the comprehensive pipeline gallery of Science City North Road as the research background,the fuzzy analytic hierarchy process is used to establish The support structure evaluation system was established,and the optimal plan was decided among the alternative plans;the foundation pit engineering under the optimal plan was established and simulated calculations using Midas GTS NX software,and the displacement of the foundation pit support and the ground surface were calculated.The deformation was discussed;during the whole construction process,the settlement monitoring and analysis of the adjacent structures of the comprehensive pipe gallery were carried out.Through the above research and analysis,it can be explained that the fuzzy analytic hierarchy process can better quantitatively evaluate and make decisions on the supporting structure of the deep foundation pit of the comprehensive pipe gallery in the complex environment,and the numerical simulation can carry out the risk nodes of the construction under the optimal supporting plan.The feasibility of the optimal scheme was estimated and verified,and the monitoring proved that the impact of the excavation of the foundation pit under the optimal scheme on the adjacent pile foundation high-rise buildings is safe and controllable.The thesis provides a decision-making method for the selection of deep foundation pit support of integrated pipeline gallery in a complex environment,and scientific verification has been carried out;the related methods and conclusions of the research can play a certain reference role for similar engineering construction.