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我局属宁乡式赤铁矿,地质构造复杂,矿石及围岩大都不稳固,在开采中采用常规的木支护,坑木消耗量大,平均每采万吨矿石消耗木材100米~3以上,而且废石混入高达15％,为解决这一问题,我们在1981年进行了现场锚杆锚固力试验及“开缝式摩擦锚杆护顶”的工业试验。1982年继续在采场进行扩大试验,现将试验应用情况介绍如后。
My bureau is Ningxiang-type hematite, geological structure is complex, most of the rock and rock are not stable, mining in the use of conventional wood support, pit consumption, mining timber consumption per million tons of ore per 100 ~ 3 , And the waste rock mixed up to 15%, in order to solve this problem, we carried out in situ anchorage test in 1981 and “slotted friction anchor guard” industrial test. In 1982 continue to expand the trial in the stope, the application of the test are introduced as follows.