【摘要】 含非贯通软弱结构面岩质边坡的变形破坏过程涉及到岩体从连续转变为非连续状态的过程,是岩石边坡工程的研究重点和难点之一。采用数值流形方法研究了岩质边坡的变形破坏过程。数值流形方法模拟裂隙扩展的优势在于其数学覆盖和物理覆盖两套网格系统,不连续面切割数学覆盖后生成相互分离的物理覆盖,数值流形方法则通过物理覆盖来形成不连续面两侧相互独立的流形单元。通过在裂纹尖端引入粘结裂纹扩展模型以及岩体起裂和扩展判断准则,发展了可模拟岩体裂隙扩展的数值流形方法。最后,采用该方法模拟了西南地区某水电站高边坡的渐进破坏过程,从裂隙扩展角度研究了岩体稳定性的影响,并提出了相应的工程处理措施。更多还原

【Abstract】 The deformation and failure process of rock slope with non-persistent weak structural plane involves the transition of rock mass from continuum to discontinuum. This problem is also one of the hot issues and difficulties in rock engineering. In this study, the numerical manifold method is used to simulate the deformation and failure process of rock slope. The advantage of numerical manifold method in simulating fracture propagation lies in its two cover systems, namely, mathematical cover and physical cover. The physical cover is generated by cutting mathematical cover using discontinuous surfaces. Then, the manifold elements are formed by the physical cover. Therefore, the two sides of the fracture are independent manifold elements. By introducing a bonded crack propagation model on the crack tips and a criterion for judging the initiation and propagation of rock mass, the numerical manifold method’s capability of simulating the initiation and propagation of multiple cracks in rock mass has been improved. Finally, the progressive failure process of a high slope of a hydropower station in southwest China is preliminarily simulated. In this example, the effects of crack propagation on rock mass stability is studied and the corresponding engineering measures are proposed.更多还原