3-D stability analysis of colossal collapse of Mt.Hakusan

山体是由岩石组成的，岩石中有许多裂缝和薄薄的粘土层。许多山体坍塌是由作用在岩石中这些分离面上的水压增加引发的。为了分析山体崩塌，需要一个处理含有多个离散面的岩体的三维构形的计算机程序。在本研究项目中，我们开发了一个专门为此目的而设计的计算机程序，并应用该程序对白山(2703米)巨型崩塌进行了分析。为了校准的目的，用开发的程序分析了许多主要发生在岩石材料极其薄弱的Noto地区的山体崩塌实例。这些试验分析的结果基本令人满意。Analysys需要的输入数据之一是位于分离面缝隙中的薄粘土材料的强度。我们成功地采集了未受干扰的薄粘土样品，然后在恒定体积条件下在剪切箱中进行了测试。如何采集样本，如何对样本进行检验也是本研究项目的有益收获。

The bodies of mountains are made of rocks which contain a number of cracks with thin layrs of clay. Many of the mountain collapse are triggered by the increase in the water pressure acting on such planes of separation in the rock mass. In order to analyze the mountain collapse, it is needed a computer program which deals with a three dimensional configuration of the rock mass containing a number of plane of separation. In this research project, we have developed a computer program designed for this purpose and apply the program to analyze the colssal collapse of Mt.Hakusan (The White Mountain, 2703m). For a purpose of calibration, many cases of mountain collapse mainly experienced in Noto area where rock materials are extremely weak are analyzed by the developed program. The results of these trial analyzes are basically satisfactory. One of the input data needed in the analysys is the stength of the thin clay material resting in the gap of the planes of separation. We have successfully taken undisturbed samples of thin clay and tested then in a shear box under conditions of constant volume. How to take the samples and how to test them are also the useful harvest of this research project.