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经典块体理论在进行块体可移动性分析和稳定性计算时是分步独立进行的,默认不可移动块体是稳定的,对不可移动块体不再进行稳定性分析。实际工程中,某些阻碍岩石块体运动的“岩桥”可能发生破坏,使得不可移动块体发生滑动。当块体的规模比较大时,在重力作用下破坏局部岩桥的可能性会增高。文中提出一种考虑岩桥破坏的块体稳定性分析方法,不再默认不可移动块体绝对稳定,计算块体稳定系数时,将阻碍块体移动的岩桥的抗剪切力纳入到块体的抗滑力中。该方法首先找出块体所有可能的滑动面和裂隙交线,识别块体沿每一个方向运动时需要破坏的岩桥,基于摩尔-库仑强度准则计算出块体沿每个方向运动时的稳定系数,然后,选取最小的稳定系数作为块体的实际稳定系数,最小稳定系数对应的方向即为块体最有可能的运动方向。
The classical block theory is carried out step by step independently in the process of block mobility analysis and stability calculation. By default, the immovable block is stable, and the stability analysis of the immovable block is no longer performed. In practical engineering, some “rock bridges” that block the movement of rock blocks may break down, causing the immovable blocks to slide. When the block size is relatively large, the possibility of destroying a local rock bridge under gravity will increase. In this paper, a method to analyze the stability of a rock mass considering the failure of a rock bridge is proposed. No longer the mass of an immovable mass is absolutely stable. When calculating the stability coefficient of a mass, the shear resistance of the rock mass that blocks the mass movement is incorporated into the mass Anti-slip force. The method firstly finds out all the possible sliding surfaces and fracture intersections of the block, and identifies the rock bridges that need to be destroyed when the block moves along each direction. Based on the Mohr Coulomb strength criterion, the stability of the block in each direction is calculated Coefficient, and then select the minimum stable coefficient as the actual stability of the block coefficient, the minimum stability factor corresponding to the direction of the block is the most likely direction of motion.