矿柱及围岩对采空区破坏影响的数值模拟研究

Simulation Study on Effect of Pillar and Surrounding Rock on Failure Process of Mined Out Area

顶板冒落、巷道底鼓和矿柱破坏是采矿过程中的重要岩石力学问题.开展采空区稳定性方面的研究,对保证矿山持续发展和人民生命财产安全有非常重要的意义.运用岩石破裂过程分析软件RFPA2D,采用不同的顶板、底板和矿柱岩性对采空区的破坏过程进行了数值模拟研究.模拟结果再现了采空区从变形到破坏的全过程.结果表明,不同的顶板、底板和矿柱岩性对采空区的破坏过程影响很大.从整个采空区的破坏过程来看,依不同的岩性对比,采空区有不同的破坏特点,微破裂均首先在软弱处产生,并由此扩展以至顶底板和矿柱破坏.

Roof falling, floor heave of roadway and pillar failure are important problems of rock mechanics in mining process. It is very necessary to research on the above-mentioned problems. Influence of different lithology of roof, floor, and pillar on the failure process of mined out area was numerically studied by using a rock failure process analysis software （RFPA^2D）. The phenomena of progressive failure leading to collapse in mined out area were numerically investigated. The result shows that the influence of different roof, floor and pillar lithology on mined out area is obvious. Failure processes of mined out area have different characteristics for different lithology. Microscopic fracture firstly comes into being in the flaccid region and consequently brings about the failure of mined out area.