Study On The Characteristics Of Bearing Capacity Of Red Clay Foundation In Karst Area Of Guilin

Red clay is a special soil widely distributed in China.Red clay has unique structure,composition and composition in karst area of Guilin.Many aspects such as physical properties,mechanical properties,determination methods and models of foundation bearing capacity are not very clear and need further study.On the basis of test,the application effect of standard penetration test,light dynamic penetration test and geotechnical test in determining red clay in karst area of Guilin is analyzed,and the bearing capacity table of foundation suitable for red clay area in karst area of Guilin is constructed.The method and model of bearing capacity of red clay foundation in karst area of Guilin are determined.The physical and mechanical properties of red clay in karst area of Guilin are obtained through the geotechnical tests including density test,water content test,direct shear test,consolidation test,specific gravity test and limit water content test.The chemical composition and mineral composition of red clay in karst area of Guilin were determined by microstructural analysis including total chemical analysis method and X-ray diffraction method.Through in-situ test,including plate load test,standard penetration test and light dynamic penetration test,the bearing capacity of red clay in karst area of Guilin is obtained.The engineering properties of red clay in karst area of Guilin are comprehensively analyzed.Through the statistical method of geotechnical parameters,Collate,statistic and analyze the test data.By linear regression analysis,the relationship between physical and mechanical properties is constructed.Through standard penetration test,light dynamic penetration test and geotechnical test,the bearing capacity of red clay in karst area of Guilin is compared with the result of plate load,and the difference between the characteristic value of bearing capacity and the result of load test is compared.The causes of the difference are analyzed from the aspects of test principle,drill pipe,depth,artificial factors and so on.The application effect of each test method in determining the bearing capacity of foundation is analyzed.The result of bearing capacity test will be more accurate by adopting the method of combining the standardized test flow and many kinds of test methods.Through statistical analysis of spss software,a table of foundation bearing capacity suitable for red clay area in karst area of Guilin is constructed.The derived bearing capacity table is compared with the ground bearing capacity table in "Code for Design of Building Foundation" and "Code for Geotechnical Engineering investigation in Guangxi Zhuang Autonomous region".The Excel table and linear fitting method are used to analyze the table of bearing capacity of foundation.The linear fitting equation of the bearing capacity table ofeach foundation is derived,and the comparative diagram of the bearing capacity table of foundation is drawn by using originpro software.Through the comprehensive analysis of the difference between the bearing capacity tables of each foundation,the bearing capacity table of the foundation suitable for the red clay in Guilin is derived,and the method and model of the bearing capacity of the red clay foundation suitable for the karst area of Guilin are discussed.