Application of Rock/Water Coupled 3-D Stability Analysis to Colossal

白山岭的整个地区，包括珍乃助河谷的两侧，都变得不稳定。通过对航片的仔细勘察和影像分析，发现珍珠谷左岸岩质边坡的失稳只是珍珠谷两侧岩体复杂滑动的一部分。整个下滑似乎是以一种渐进失败的形式发生的。采用岩水耦合三维稳定性分析方法对巨型山体崩塌进行分析。该分析是基于一个岩坡中被多个不连续面包围并与相邻岩体分开的一块岩块的简单力平衡。通过对航片的勘探和图像分析，找出了几个不连续面。在块体自身重量和作用在结构面上的地下水压力的共同作用下，岩体的稳定性是通过嵌入在形成滑动面的薄间隙中的材料的抗剪作用来维持的。当抗剪强度不足以抵抗驱动力时，就会发生边坡破坏。结果表明，用三维力平衡的简单原理可以较好地估算含裂隙软粘土材料边坡的安全系数。

The whole area of the ridge of Hakusan including both sides of Jinnosuke Valley is becoming unstable. As the results of careful exploration and image analyses of aerial photograph, it was found that the instability of the rock slope on the left bank of Jinnosuke Valley is only a part of complex slide of rock masses on both sides of Jinnosuke Valley. The whole slide seems to be taking place in a form of progressive failure. Rock/water coupled 3-D stability analyses are applied to the colossal mountain-collapse. The analysis is based on simple force equilibrium of a block of rock surrounded with several planes of discontinuity and separated from the neighbouring rock mass in a rock slope. The several planes of discontinuity were found by the exploration and image analyses of aerial photograph. Driven by the own weight of the rock block together with the ground water pressure acting on the planes of discontinuity, the stability of rock mass is maintained by the shear resistance of the materials embedded in the thin clearance forming the slip surface. A slope failure takes place when the shear strength is not strong enough to resist the driving forces. It was found that the simple principle of three dimensional force equilibrium is good enough to estimate the factor of safety in the slopes of rock mass containing the cracks filled with soft clayey materials.