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节理、裂隙控制着地表岩体的力学强度和导水特性。采用遍布节理力学模型和饱和非饱和等效连续介质渗流模型反映节理的主导作用,基于节理连通率将岩体的渗流特性与力学特性耦合起来,分析了在FLAC3D中实现渗流与力学耦合机制、降雨边界条件处理以及连通率演化,并开发了适用于FLAC3D的多组遍布节理模型,模拟了海南矿业联合有限公司一顺层平台边坡降雨过程中渗流场和力学场的变化。计算结果表明,降雨开始后边坡地表迅速饱和并形成暂态饱和区,随着降雨的继续,边坡负压区进一步缩小,同时暂态饱和区也不断扩大;在降雨结束后,由于水压力迅速消散造成暂态饱和区开始减小,在降雨过程中渗流也会引起层面的破坏和其裂隙连通率的演化。因此,运用上述耦合分析模型计算降雨入渗对边坡稳定性的影响是可行的。
Joints and fissures control the mechanical strength and hydraulic conductivity of surface rock masses. The joint mechanics model and saturated unsaturated equivalent continuum percolation model are used to reflect the leading role of joint. The seepage and mechanical coupling characteristics of rock mass are analyzed based on the joint rate of joint. The mechanism of seepage and mechanical coupling in FLAC3D, Boundary conditions and the evolution of connectivity, and developed a multi-group all-joint model for FLAC3D, which simulates the change of seepage field and mechanical field during the rainfall of a platform slope of Hainan Mining Joint Co., Ltd. The calculated results show that the surface of the slope is rapidly saturated and forms a transient saturated zone after the rainfall begins. As the rainfall continues, the negative pressure zone of the slope further decreases and the transient saturated zone expands continuously. After the rainfall is over, Dissipation causes the transient saturation zone to begin to decrease, and seepage during rainfall also causes layer failure and the evolution of fracture connectivity. Therefore, it is feasible to calculate the influence of rainfall infiltration on slope stability by using the above coupling analysis model.