底摩擦重力试验在倾倒变形岩体稳定性研究中的应用

The application of bottom-friction gravity test to the study of the stability of the toppling rock mass

底摩擦重力试验(底摩擦试验)是利用相似理论分析原理,将研究原形按几何比例和各种物理力学参数,制作相似模型及确定相应的边界条件。然后按照相似边界条件进行加载试验,再现曾经发生过或今后将会出现的物理力学现象,进而了解其发展演化规律及其对工程的影响。澜沧江某水电站坝肩主要为典型的倾倒变形岩体,为探讨倾倒变形岩体在天然重力场条件的变形破裂发展趋势。试验采用模拟重力场条件的岩体底摩擦模型试验技术模拟分析岩体倾倒变形进一步发展演变过程及特征。

The bottom-friction gravity test （or the bottom-friction test） makes use of the principles of the similarity theory, that is, to establish a similar model of the original object in smaller size and with similar physical parameters, to set up similar boundary conditions appropriate to the original ones, and then to carry on the loading test according to the similar boundary conditions. Thereby, certain physical and mechanical phenomena will appear which either have already occurred or will occur in reality. Therefore, from the test we may have a better understanding of the regularity of the evolution of the object and its influence to the engineering project. The dam shoulder of the Laneang River power station contains the rock mass that tends to be toppled. In order to investigate the development trend of the toppled rock mass under the natural gravitational field condition, we carried out a rock bottom-friction modeling test to simulate the condition of the toppling rock mass and investigate the process of the development of the rock＇s toppling deformation under the action of the simulated gravity.