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降雨引起的滑坡作为一种主要地质灾害,使世界各地遭受了严重的损失。降雨时,水的入渗导致孔隙水压力分布的巨大变化,从而降低了坡体的抗剪强度和坡体稳定性。许多学者已研究过水的入渗过程。非饱和区中影响地下水位的地面条件很复杂,所以很难确定性地预测稳定性计算所需的孔隙水压力分布状态。坡体稳定性计算中的暂态滲流影响仍需研究。本文的目的:阐明非饱和坡体中孔隙压力分布的特征;揭示不同初始水力边界条件、降雨强度和历时下,渗流场的敏感性;阐述上述因素作用下稳定性系数的敏感性。
As a major geological disaster, rainfall-induced landslides have caused serious losses across the world. During rainfall, infiltration of water leads to great changes of pore water pressure distribution, which reduces the shear strength and slope stability of the slope. Many scholars have studied the infiltration process of water. The surface conditions affecting the groundwater level in the unsaturated zone are complex, so it is difficult to predict the pore-water pressure distribution required for stability calculation with certainty. The transient seepage effect in slope stability calculation still needs to be studied. The purpose of this paper is to clarify the characteristics of pore pressure distribution in unsaturated slopes, to reveal the sensitivity of different initial hydraulic boundary conditions, rainfall intensity and duration, seepage field, and to explain the sensitivity of the stability coefficients under these factors.