浅部采场地压的试验研究

THE TEST AND RESEARCH OF STRATA STRESSES AT THE STOPE NEAR THE EARTHS SURFACE

本文根据龙头锰矿李家背矿段试验采场室内模拟试验结果,和现场试采了一个采场(上部),三个矿房(下部)的初步观察,分析研究了覆岩厚度六十余米时,开采缓倾斜(8°～12°)矿层采场围岩移动的特点和矿柱承压的性态。试验研究表明,采场顶板岩层的稳固性土要受岩层层面、节理、裂隙的制约;全面法采场中留下的不规则矿柱,承压大,且随顶板暴露面积和时间的增加而增加;在开采多层近距矿层时,上下对齐地留设矿柱,利于回采作业的安全。

According to the laboratorial simulated testing results of the Li-jia-bei testing stope at longtou Manganese Mine in Guangxi, and to the initial observes after to be mined a open stope (above)and three pillarand-rooms (under), this paper analysed the moving characters of the surrounding rocks in the stope by the conditions the thickness of coverburden egual more 60m bight, the dip angles of the ore beds equal g to 12 degrees. Also, it analysed the properties of the pillars. The test and research indicated, the stability of the open stope's roof strata mostly depended on the layer's stratifications, joints and crevicesj the random pillars remained in the stopes not only support a great presure, but the pressures would be increased with the area and the time exposed as well; when workings in neighbour and multi-bed of ore, the pillars would be designed and remained in such a manner that pillars above and un der in dip and strike would be aimed at each other, so that the mining operations can be done safely.