Coefficient Of Subgrade Reaction Test Methods And Results Of The Analysis

In this paper, Xi'an Subway One Line (Chaoyang Gate - JinHua Road) based on geotechnical engineering investigation, according to the study area strata of geotechnical conditions, combined with the requirements of relevant national norms, the study area choose Coefficient of Subgrade Reaction formation of three kinds of testing methods to test and analysis, a comprehensive study area to determine the values-based bed and made a base coefficient of test-bed of some of the recommendations.First of all, the study area based on strata of geotechnical conditions, that is typical of loess formation region, combined with "underground railway, geotechnical engineering investigation of traffic light norms" (GB 50307-1999) is given Coefficient of Subgrade Reaction of the two test methods: load indoor test and triaxial tests (consolidation test). Taking into account the survey work and drilling, cone penetration testing, pumping test and other investigation methods and means of synchronization, the ultimate load test selection, indoor test and triaxial tests, pressuremeter test bed for the study area-based coefficient of the main testing methods.Second, testing the use of Coefficient of Subgrade Reaction for the methods were introduced, mainly to introduce a variety of testing methods based on the theory, testing theory, test equipment, test points, test process, data and statistical results.Thirdly, the three tests of the equipment used to test the process and the work carried out in detail and in accordance with the results of three test data, carried out a detailed analysis of statistics and raw data, by stratum (that is depth) are given a variety of tests measured the coefficient of subgrade soil, which by the load test and triaxial test indoor soil reached the vertical and level of Coefficient of Subgrade Reaction Coefficient of Subgrade Reaction, pressuremeter test to draw the foundation soil Coefficient of Subgrade Reaction level.Fourth, the physical and mechanical properties of soil indicators for statistical analysis, refer to the existing literature, summarize the experience of the formula:by the compression modulus and Poisson's ratio can be calculated Coefficient of Subgrade Reaction. This approach has been adopted by the values-based bed load test results with basically the same.Finally, in order to load based on the results of K₃₀ tests, lab test with the value calculated in the light and indoor Pressuremeter triaxial test results, integrated to determine the coefficient of subgrade. At the same time, based on the coefficient of test-bed to choose their own proposals for the Xi'an area value of Coefficient of Subgrade Reaction of the accumulation of experience has provided the raw data.