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提出了一种适用于分析含压剪裂缝结构的非线性断裂力学数值分析模型——压剪钝裂缝带模型；并基于此模型，提出了一种新的求解方法——调整力向量法，可较方便地求解复杂的压剪断裂问题；并编制了相应的非线性有限元计算程序。进而对龙滩碾压混凝土重力坝的建基面和碾压层进行了压剪断裂过程分析，得到了裂缝的发展过程及相应的应力、应变场，并对软化模型作了计算比较分析；同时，得到了大坝各高程的材料强度储备系数。最后，得出大坝上游防渗措施和保证水平施工缝具有足够的抗渗要求是保证龙滩大坝稳定安全的关键的结论
A numerical model of nonlinear fracture mechanics, which is suitable for the analysis of fracture structures with pressure-shear, is presented. A model of blunt pressure-shear blunt fracture zone is proposed. Based on this model, a new solving method, It is more convenient to solve the problem of complicated compression-shear fracture. The corresponding non-linear finite element program is compiled. Then the pressure-shear fracture process of the foundation and the roller compacted layer of the Longtan RCC gravity dam is analyzed. The development process of cracks and the corresponding stress and strain fields are obtained, and the softening model is calculated and compared. Meanwhile, , Got the dam material strength reserve coefficient of each elevation. Finally, it is concluded that the seepage control measures at the upstream of the dam and the assurance that the construction joints have sufficient impermeability requirements are the key conclusions to ensure the stability and safety of the Longtan Dam