Application And Regularity Of Pressure Test In Luoyang Subway Project

The side pressure test is an on-site in-situ test in the engineering survey.The characteristics of the test are accurate test results and simple operation,especially in the metro project engineering survey work.This article mainly through the side pressure test and field K30 load test,double bridge static penetration test and indoor triaxial test for comparative analysis of the physical and mechanical parameters of the soil pressure test to determine the following aspects of the study:(1)Determine the values of p0,pf,and pl from the side pressure curve,calculate the value of the side pressure modulus,obtain the range of the calculated values of the side pressure modulus of different formations,and analyze the influencing factors of the side pressure modulus of different formations.(2)This paper carefully reads the existing literature on the side pressure test theory and combines with the results of the pressure test of the third section of Luoyang Metro Line No.1,and analyzes the data of the side soil pressure test of the test section.Combined with the results of the pressure test and field K30 test,the regression equation and correlation coefficient of the lateral pressure modulus and the horizontal subbed coefficient of the foundation soil were obtained.(3)Calculate the undrained shear strength and internal friction angle of the foundation soil in the test section.The calculated values are compared with the results obtained from the indoor triaxial test,and the empirical coefficients of the soil strength parameters calculated by the pressure test are obtained.(4)Finally,through the on-site test of the side pressure test,standard penetration test,static penetrating(double bridge)test,etc.,the bearing capacity of the foundation soil was calculated and compared with the design value.The side pressure test was obtained through error analysis.Calculate the empirical coefficient of bearing capacity of foundation soil.This paper compares the conclusions of the side pressure test with different tests to provide reliable empirical formulas and empirical coefficients for follow-up construction and other project construction of Luoyang Metro,shorten the survey period,save survey costs and construction investment.