Research On Influence Of Foundation Pit Excavation On Surrounding Pipelines

With the construction and development of modern cities in China,the development and utilization of underground space has gradually increased.While the foundation pit project is developing to ultra-deep,it also brings a series of safety problems.It is mainly reflected in the construction difficulty of the deep foundation pit project and its security impact on the surrounding environment.During excavation of foundation pit,the deformation of soil around the foundation pit is bound to have an impact on the security of the surrounding environment,especially the safety of the normal use of the surrounding municipal pipelines.In addition,the safety of pipelines is directly related to the normal life of people and the stability of society.Therefore,it is of great theoretical and practical significance to carry out research on the impact of excavation of foundation pits on the surrounding pipelines.Based on the project of a creative park in Beijing,this paper makes a thorough investigation and analysis of the relevant research results at home and abroad,and adopts the method of theoretical analysis and numerical simulation based on the principle of soil displacement and deformation and its influence on pipeline safety.The foundation pit,soil and pipeline are considered as one.These include the following:1.According to the principle of excavation of deep foundation pit and the characteristics of displacement and deformation of soil,the theory of excavation impact on the surrounding environment is studied.The finite element numerical simulation model was established by using specialized software,and the influence of excavation on the safety of the surrounding pipeline was analyzed systematically.2.According to the geological conditions of the project and the surrounding pipeline conditions,the foundation pit support scheme is designed to simulate and analyze the safety impact of the construction process of the proj ect on the surrounding pipeline,and based on indicators such as the settlement displacement value of the pipeline and the settlement difference.By changing the support mode and adjusting the anchor bar parameters,the optimal design of the foundation pit support scheme is optimized,and a safe and reasonable optimal design scheme is selected.3.The pipeline safety evaluation model is established by the analytic hierarchy process,the pipeline safety analysis is made,the pipeline safety level is obtained,and reasonable construction suggestions are given.