The Research On The Methods Of Determining The Bearing Capacity Of Foundation By The Tests In Situ In Zhejiang Area

In the past, the physical indexes and mechanical indexes of soil are usually determined by soil tests in the laboratory, and the bearing capacity of foundation can be also obtained. The sample is easily disturbed, and the sampling of soil is always difficult. At the same time, the soil tests in the laboratory can't meet the needs of the rapidly developing construction engineering. Being different from soil tests in the laboratory, the tests in situ can determine the physical properties and mechanical properties of soil, in the state of nature structure, water content and initial stress, which can be carried out at the initial place of the soil. Therefore, it is practical to determine the bearing capacity of foundation by the parameters of the tests in situ.A great number of datum of the tests in situ are collected and analyzed in this thesis. The empirical formula, which can calculate the bearing capacity of foundation in Zhejiang area, is obtained by analyzing the datum of the tests in situ, which include cone penetration tests and standard penetration tests. Eliminating the difference between the national criteria and regional criteria, the bearing capacity of foundation in Zhejiang area can be determined more directly.The major works and results of this thesis are as follows:(1) Firstly, a great number of datum of the tests in situ in Zhejiang area are collected. Secondly, the datum are chosen which can reflect the relationship between the bearing capacity of foundation, modulus of compression and the parameters of the tests in situ. Finally, the empirical formula are obtained, which can calculate the bearing capacity and modulus of compression of the ground in Zhejiang area by using the datum of in suit tests.(2)The relationship between the parameters of the tests in situ and the physical indexes, and mechanical indexes of soil, the bearing capacity of foundation is expressed by both of diagrams and formula.(3)Considering the basic physical indexes and mechanical indexes of the soil, the combined formula of the foundation's bearing capacity is established in which obtained from cone penetration tests, water content w and void ration e are involved.