Numerical Simulation Of Composite Soil Nailing Wall Support For Deep Foundation Pit In Northern Anhui

In recent years,with the development of science,technology and economy,the number of people is rising,urbanization is progressing faster and faster,and the contradiction between urban development and population growth is becoming more and more serious.Urban buildings are developing toward higher and deeper levels.High-rise buildings,deep foundation pits and underground projects have emerged one after another.Underground space has a broad market.In the original building,most of the building height is not very high,so the foundation pit depth and support requirements are not very high.However,in today's buildings,a large number of high-rise buildings appear,the use of underground space is also increasing,resulting in many deep foundation pit projects with different depths.Foundation pit engineering is an important link in the construction process,not only closely related to the quality of construction projects,but also closely related to the construction period of construction.Therefore,in order to ensure the safety of the foundation pit project,it is necessary to adopt the corresponding structure to prevent the damage of the foundation pit,so as to ensure the orderly progress of the entire construction project.Composite soil nailing wall is a kind of composite supporting system,which is based on soil nailing wall and combined with one or more supporting structures.Composite soil nailing wall mainly has soil nailing,prestressed anchor,followed by water cut-off curtain,micro-pile,and finally hanging net shotcrete surface and in-situ soil.Composite soil nailing wall is widely used in actual construction projects.The composite soil nailing wall supporting structure is light in weight and flexible in construction method,and is suitable for most engineering geological conditions.Secondly,composite soil nailing wall support has low engineering cost,short construction period,and high safety and reliability.In practical engineering,the composite soil nailing wall can be used as the advance support of foundation pit because of its strong supporting capacity,and also has the function of water retaining.Composite soil nailing wall can be flexible and varied in various forms according to the needs of engineering construction.The composite soil nailing wall is adopted in the deep foundation pit of this project,which is an advanced construction technology,convenient construction method,economic construction cost and strongcomprehensive performance of foundation pit support technology.Based on the construction project of Fuyang Chengjian Xiangrui Residential Area,this paper uses Abaqus finite element analysis software to model the deep foundation pit project,then simulates and analyzes the model according to the actual engineering geological conditions,and finally compares the analysis results with the actual project site measurement data to verify the accuracy of the design scheme.The stability of foundation pit slope is verified,and the displacement of the side of foundation pit is verified in a reasonable range.The main content of the article is as follows:(1)The status of main research,research methods and technical routes of deep foundation pit at home and abroad are briefly introduced.(2)Briefly introduced the common two earth pressure theories of foundation pit and the common advantages and disadvantages of foundation pit enclosure structure.(3)The article introduce the general situation of urban construction and auspicious neighborhood project and the construction method of deep foundation pit.(4)The operation mode of Abaqus finite element analysis software is introduced briefly,the modeling method of foundation pit and the process of simulation analysis are introduced in detail,and the finite element model data are obtained.The post-processing mode of the software can accurately reflect the stress distribution inside the foundation pit and the position of each direction.(5)According to the monitoring report of the actual project,the experimental data obtained from finite element analysis and simulation are compared with the monitoring report,which can verify the reliability of Abaqus finite element analysis software simulation results,and provide the valuable reference for future construction projects.