基于经典Drucker-Prager破坏准则的岩体滑移线理论

摘要

The existing slip-line theory mostly uses the Mohr-Coulomb failure criterion to solve problems of the ultimate bearing capacity of soil and slope stability for soil.In solving the questions of the bearing capacity and stability of rock mass,the existing theory of slip-line is applied to solve in the strength of the rock mass damage problem has many shortcomings.In this paper,based on the classical (D-P) failure criterion for rock mass,considering the nonlinear characteristics of rock mass failure curve and the influence of intermediate principal stress,a parameter m for intermediate principal stress is introduced and the slip-line theory for rock mass is deduced,slip-line theory can more accurately applied to the rock,and connecting with an example,the derivation of the formula is verified finally.For the slip-line method is used to solve the bearing capacity of rock slope and batholith rock damage problems,such as theory basis.%现有的滑移线理论主要求解土体极限承载力、土坡稳定性等问题,在求解岩体的承载力、稳定性的问题时,现有的滑移线理论应用到求解岩体的强度破坏问题中存在诸多的不足.考虑岩体的非线性破坏特性和中主应力的影响,基于经典(D-P)岩石强度准则,引入中主应力参数m,推导适应于岩体的滑移线理论,能更准确地应用到岩石中,并结合算例对推导的公式进行了验证.进而为滑移线法在求解岩质边坡和岩基承载力等岩石破坏问题奠定理论基础.