Research On The Effects Of Foundation Pit Excavation On The Surrounding Underground Pipeline

With the development of city construction,many new buildings are built in the city construction,the influence of urban new buildings on the safety of urban underground pipelines is particularly important.For the construction of the new city building pit excavation is more important influence on the relationship between the construction of surrounding ground.In urban construction,deep excavation construction process very large impact on the surrounding environment,buried around their relationship to influence safety is more important,under the conditions existing on different factors during excavation of buried pipelines in the surrounding displacement influence of research and analysis.The predecessor of foundation pit excavation on adjacent underground pipelines affected do a lot of analysis and research,but the concrete under different conditions of buried pipeline by excavation,research on the regularity of less.Using the numerical simulation software ABAQUS,build up combine together the whole model of excavation and retaining structure,soil and pipeline,the pipeline under the condition of various factors pipeline displacement changes of refinement research analysis.The main research contents of this paper and the conclusion are as follows:(1)In this paper,based on the application of numerical simulation software ABAQUS,the three-dimensional model of foundation pit-Pipeline-underground continuous wall-soil is established in this paper,and the selection of parameters in the specific model,the model size and the specific data of the pipeline are selected,the selection of the stress balance method of the pipeline in the initial analysis step is described in detail.(2)This paper in the predecessors in the buried safety related problems in the basis of buried by different influence factors,pipeline by the influence of the excavation of foundation pit,the pipeline displacement curve of simulation analysis and research.Using numerical simulation software for each unit block overallanalysis.The influence factors of pipeline under different conditions by numerical simulation.Different factors include: line spacing different from the pit,located in different pipeline depth,diameter pipeline under different conditions,different depth excavation conditions,pipeline materials under different conditions.The results obtained from the numerical simulation are analyzed and the conclusion is drawn.(3)The numerical simulation results of a detailed analysis,this paper on pipeline under the condition of various factors,the pipeline by influence of foundation excavation produced displacement curves in the X axis,Y axis and Z axis and compositive displacement analysis on specific changes curve of concrete analysis.And in the analysis of the results,it is found that the general displacement curve of the pipeline is generally close to that of the pipeline in the direction of Z axis.And the line under the conditions of different factors,but irregular line displacement ships,but there was no regular variation,such as the line displacement curve at different depths excavation conditions.In this paper,the preliminary study on the influence of the pipeline under different conditions on the excavation of foundation pit is studied in detail.It is concluded that the displacement variation law of pipeline under different conditions in the X axis,Y axis,Z axis analysis.By analyzing the pipeline during excavation line position of maximum displacement difference,judged pipeline under excavation conditions can easily destroy the area.Given the affected line and curve variation of the basic laws of change.