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基于三剪强度准则研究了库伦土压力计算问题。(1)采用能反映岩土在三向应力作用下强度特征的三剪强度准则代替莫尔-库伦强度准则,该准则表达的是一个强度准则系列,莫尔-库伦强度准则仅为其特例。(2)基于三剪强度准则所得到的库伦土压力计算式可适用于不同的工程岩土,以往基于莫尔-库伦强度准则的土压力计算式也仅为其特例。(3)实例计算结果表明,岩土应力状态和力学特性对土压力值有一定影响。另外,采用莫尔-库伦强度准则时,库伦主动土压力值可能会因没有考虑中间主应力效应而高估,库伦被动土压力值则相反。
Based on the tri-shear strength criterion, the problem of Coulomb earth pressure calculation is studied. (1) The Mohr-Coulomb strength criterion is replaced by the tri-shear strength criterion that can reflect the strength characteristics of geotechnical under three-direction stress. The criterion expresses a series of strength criterion and the Mohr-Coulomb strength criterion is only a special case. (2) The formula of Coulomb earth pressure based on the triple shear strength criterion can be applied to different engineering geotechnical. The earth pressure calculation formula based on the Mohr-Coulomb strength criterion is only a special case. (3) The calculation results of the examples show that the geotechnical stress state and mechanical properties have certain influence on the earth pressure. In addition, using the Mohr-Coulomb strength criterion, the coulomb active earth pressure value may be overestimated without considering the intermediate principal stress effect, and the coulomb passive earth pressure value is opposite.