工作面推进方向对坡体采动裂缝影响的数值模拟

Numerical Simulation on the Influence of Working Face Advancing Direction on Fracture Caused by Slope Mining

山体采动裂缝是诱发坡体滑坡的重要因素。通过UDEC数值模拟分析了工作面上坡和下坡开采产生山体裂缝的差异,结果表明:工作面上坡开采时下半坡体和坡脚受采动附加应力作用很难形成较大的裂缝,下坡开采时坡顶、坡体中部更容易产生较大裂缝;上坡开采形成牵引型正裂缝,下坡开采形成推动型逆裂缝;上坡开采超前裂缝距离大于上坡开采。

Fracture caused by mining in mountain is the major influencing factor of inducing slope landslides.The paper studied the difference of fracture during upslope mining and downslope mining at working face with the UDEC numerical simulation.The research shows that the fractures under additional stress action are difficult to formed on lower parts and toe of slope during upslope mining,and they are easy to formed on the top and central of slope during downslope mining;the tractional normal fractures are formed during upslope mining,and promoted reverse fractures are formed during downslope mining;the distance of the advance fracture during upslope mining is greater than that during downslope mining.