大同煤矿采场坚硬顶板控制方法与工程效果

Controlling Methods and Engineering Effects of Strong Roof in Datong Mining Area

介绍了坚硬顶板爆破放顶和深孔高压注水压裂弱化顶板的机理,及收到的效果。

With hard rock roof and very hard rock roof, the rock mass in Datong mining area has undeveloped joint, thick slice height, and firm integrality. The roofs are non-collapsed after working, the goafs are unable to pack fully after caving. The unsupported roof is in the state of two-dimensional stress, only one downward free surface existed.It is not only affected by ground stress field but also by gravity field. That's why we adopted the methods of blow down and high-pressure water injection into deep holes to weaken the roof.Very good engineering results have been achieved. This paper has introduced the mechanism of blow clown and high-pressure water injection into deep holes to weaken the roof in detail.