块裂结构岩体中的三维应力传递

Transmitting of three dimensions stresses in block structure rock mass

利用岩石力学中碎裂介质理论提出的方法,研究了应力在三维块裂介质中的传递规律.根据矿山地下开采中采场上方一定范围内岩石破断后可能形成的块体形状,把破断块体抽象成具有一定长、宽、高和破断角的规则块体,建立了采场上覆岩层三维块裂介质力学计算模型;借助应力计算理论,研究了自重应力在三维块裂介质模型中的传递规律,得到了相应的三维应力计算公式.块裂介质中块体自重产生的三维应力大小受计算位置上方岩块数量、岩块密度以及岩块的长、宽、高、破断角等几何参数的控制,同时还与块体的重力分解系数有关.

The transmitting law of three dimensions stress in block structure rock mass was researched by using the method of fracture medium theory in rock mechanics. Based on the shape of blocks in broken zone of the strata over working site in underground mining, the rock blocks in broken zone were drawn as regular blocks which have constant length, width, height and breaking angle, and mechanics calculating model about three dimensions block media was set. With the aid of stress calculating theory, the principle of gravitational stress transmission in block structure rock mass was researched, and the stress calculating formulas in three dimensions were obtained. The values of three dimension stresses caused by dead weight of rock blocks are controlled by number of blocks above the calculated block, unit weight of rock and geometry coefficients as length, width, height and breaking angle of rock block, and concerned with the resolution factor of gravity force of block.