中文摘要：

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。

英文摘要：

The mechanical strength and water conduction characteristic of rock mass near the surface are mainly controlled by joints and fractures.The ubiquitous joint mechanical model and saturated-unsaturated equivalent continuum media seepage model are coupled by joint connectivity rate to simulate the leading role of the joints.Based on FLAC3D,the mechanism of seepage-mechanics coupling,treatment of rainfall boundary condition and connectivity rate evolution are elaborated,as well as new multi-group ubiquitous joint model is developed.Through analysis of seepage and mechanics fields in a platform slope of Hainan iron ore under rainfall,it is shown that rock near the surface is saturated rapidly with the formation of transient saturated zone due to the rainfall.As the rain continues,the negative water pressure region has further shrunk while the transient saturated zone is just on the contrary.After the rain,the transient saturated zone begins to decrease due to rapid water pressure dissipation.The simulation also indicates that the layer is fractured and its connectivity rate is changed as well because of the seepage in rainfall process.Therefore,the coupled model above is reasonable to analyze the influence of slope stability under rainfall condition.