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通过分析指出，用近似于矩形或长方体的常规实体单元描述平面或空间岩体问题中的软弱结构面， 其精度比简化的节理单元或夹层单元要高．在计算效率上，由于简化的节理单元或夹层单元的劲度矩阵元素与常规实体单元相同，因而简化的节理单元或夹层单元并无优越性，对岩体中软弱结构面的描述可采用常规的实体单元而无需进行特殊处理．由于结构面的屈服、破坏一般是沿着结构面的走向发生的，且抗拉强度较低，因而提出了适用于软弱结构面的广义摩尔库仑（ 简称ＭＣ） 屈服准则．用两个简单算例来验证本文提出的常规实体单元结合结构面广义ＭＣ 屈服准则对带软弱结构面岩体进行弹塑性分析的合理性、正确性．
Through analysis, it is pointed out that the use of conventional solid elements approximate to rectangles or cuboids to describe the weak structural planes in plane or space rock mass problems is more accurate than the simplified joint or sandwich elements. In terms of computational efficiency, the simplified joint element or sandwich element has no advantage because the simplified stiffness element of the joint element or the sandwich element is the same as the conventional solid element, and the description of the weak structural surface in the rock mass can be conventional. Physical units without special treatment. Because the yield and failure of the structural plane generally take place along the strike of the structural plane and the tensile strength is low, a generalized molar Coulomb (MC) yield criterion suitable for the weak structural plane is proposed. Two simple examples are used to verify the reasonableness and correctness of elasto-plastic analysis of rock mass with soft structural plane by the generalized MC yield criterion of the general solid element combined with the surface proposed in this paper.