Abstract：Most of the existing ultimate bearing capacity theories can only be used in deep strip foundation. There are less researches on the three dimensional problems of deep rectangle foundation that are often encountered in practical engineering so far. According to the static equilibrium of rigid-plasticity body，a new analytical solution of deep square foundation is presented. With considering the bearing capacity factors of cohesion and density of soil，the analytical universal solution of deep rectangle foundation is received combined with the analytical solution of deep strip foundation. The relationship between bearing capacity factors Nc，Nq and ratio of length and width of deep rectangle foundation in different internal friction angle of soil and the relationship between bearing capacity factors Nc，Nq and internal friction angle of soil in different ratio of length and width of deep rectangle foundation are investigated when the ratio of depth and width of foundation is two. And the relationship between bearing capacity factors Nc，Nq and ratio of depth and width of foundation in different internal friction angle of soil are investigated when the ratio of length and width of foundation is two. The results show that the changing trend of the curve of bearing capacity factors Nc，Nq are almost the same，but the value of bearing capacity factors are different when compared with the semi-empiric formulas. The value of Nc are almost the same，on the other hand，the difference of the value of Nq is obvious. There will be more researches to do to perfect the semi-empiric formulas.
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2014, Vol. 33 
