Engineering Geological Evaluation Of Beijing Subway ChangPing Line Ming Tombs Station

In recent years,the Beijing subway industry into the growth of the "golden age",in September 2015,approved by the National Development and Reform Commission,the Beijing subway new projects 12,the new mileage of more than 260 kilometers.It is expected that by the end of 2020,the scale of Beijing rail transit network will reach nearly one thousand kilometers.The geological conditions encountered in the construction of subway project are complicated and changeable,resulting in the complexity of the structure of rail transit engineering,the diversity of technology,the high risk of quality and safety,and the geological conditions also restrict the construction period and cost.Therefore,in order to ensure the safety of the subway,fast,stable,geological work plays a vital role.Should be in-depth study and analysis of the geological environment of the project location,a comprehensive understanding and control of various types of geological risks may occur.In addition,another problem facing the subway construction is the construction of the deep foundation pit of the subway station.Based on the specific location and engineering characteristics,a series of in situ tests and test methods are used to carry out detailed survey and make engineering geological evaluation.Analysis of Internal Force,Settlement and Integral Stability of Supporting Structures by Limit Equilibrium Method and Finite Difference Method.Through the analysis,the overall stability of the pit,anti-overturning stability and anti-uplift stability to meet the design and specification requirements.The main work of this paper includes the following contents: First,through the in situ test,the results of geotechnical experiments combined with regional geological data to analyze the engineering geological conditions;Secondly,the results of the test and the physical and mechanical properties of geotechnical stability and stability of the site Adaptability,foundation pit stability,soil and water corrosion,seismic effect,engineering and the surrounding environment to make an assessment;through the comprehensive analysis of the data on the geological conditions of the project to give the views of the design parameters,Program,environmental impact and engineering monitoring,etc;by analyzing the overall stability of the pit foundation,anti-overturning stability and anti-uplift stability to meet the design and specification requirements.The conclusion provides a scientific and reliable basis for the construction of safe,fast and stable construction,which has important theoretical and practical significance and practical significance.