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提出了考虑岩体低抗拉性质的三参数屈服准则。将该屈服准则与Ｍｏｈｒ－Ｃｏｕｌｏｍｂ（简称ＭＣ）或Ｄｒｕｃｋｅｒ－Ｐｒａｇｅｒ（简称ＤＰ）屈服准则联合使用时，形成具有包络型的、基于ＭＣ（ＤＰ）的三参数复合弹塑性模型，克服了常规的ＭＣ（ＤＰ）或带截断的ＭＣ（或ＤＰ）屈服准则不能或只能简单考虑岩体低抗拉性质的缺点。同时，提出了岩体材料屈服后的包络型软化曲线，为岩体材料的非线性计算提出了完整的计算模型。此外，还给出了基于ＭＣ（ＤＰ）的三参数包络型模型应力积分“向后欧拉”算法及一致性弹塑性矩阵有关公式，使建立在此基础上的Ｎｅｗｔｏｎ－Ｐａｐｈｓｏｎ解法具有二阶收敛性。
A three-parameter yield criterion considering the low tensile properties of rock mass was proposed. When this yield criterion is combined with Mohr-Coulomb (MC) or Drucker-Prager (DP) yield criterion, a three-parameter composite elastoplastic model based on MC (DP) with envelope type is formed, overcoming the conventional ones. The MC(DP) or MC (or DP) yield criterion with truncation cannot or can simply take into account the disadvantages of low tensile properties of the rock mass. At the same time, the enveloping softening curve of the rock material after yielding is put forward, and a complete calculation model is proposed for nonlinear calculation of the rock material. In addition, MC (DP)-based three-parameter enveloping model stress integral “backward Euler” algorithm and related formulas of consistent elasto-plastic matrix are also given, which makes the Newton-Paphson solution based on this second-order. Convergence.