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该文假定软土服从Tresca强度条件,采用上下限定理,求得了矩形截面条形基础在无限软黏土空间中的极限承载力解析解。基于该解析解,分析了软黏土地基中条形基础的深度修正系数取值问题。研究结果表明,基础埋深达到数倍基础宽度时,软粘土产生绕基础顶、底面的塑性流动,极限承载力随深度不再增加,承载力存在上限。
This paper assumes that the soft soil complies with the Tresca strength condition and the upper and lower bound theorems are used to obtain the analytical solution of the ultimate bearing capacity of the rectangular section strip foundation in the infinite soft clay. Based on this analytical solution, the problem of calculating the depth correction coefficient of strip foundation in soft clay foundation is analyzed. The results show that when the basic depth reaches several times the basic width, the soft clay will produce plastic flow around the top and bottom of the foundation. The ultimate bearing capacity will no longer increase with the depth and the upper limit of bearing capacity exists.