Elastoplastic Solution And Application Of Cylindrical Cavity Expansion In Soil Based On The Mohr-Coulomb Model

Shear strength parameters of soil is very important for the design and construction of geotechnical engineering, but the existing in-situ tests of soil have not been able to measure the shear strength parameters directly. In order to solve this problem, this paper conducted elastic-plastic analysis based on the cavity expansion theory of Vesic and Mohr-Coulomb model, then put forward a concept design of a new in-situ testing device with the deduced elastoplastic solution. The main contents and results of this thesis are as follows:1) It have done a lot of research and relevant literature, domestic and foreign research results are summarized and finished; Analyzing the current status of theoretical research, understanding of the principles of cavity expansion theory, applications, in-depth and summarizing the advantages and disadvantages of various theories.2) Based on elastic-plastic theory and Vesic cavity expansion theory, using the limit equilibrium analysis methods to make the elastic and plastic analysis of the cylindrical cavity expansion which is under uniform pressure or confining pressures ranging from two-way.3) Using finite element software MIDAS to make the finite element analysis of the cylindrical cavity expansion, which is under uniform confining pressure or confining pressures ranging from two-way. Compared the numerical results and the solution of the formula obtained in the foregoing to make sure the formula is correct.4) Summarized the status of the development and the disadvantages in obtaining soil parameters by in-situ testing, putting forward a concept design of a new in-situ testing device according to deduced theories.