论文部分内容阅读
平顶山二矿自1974年开发庚组煤以来,所有沿庚_(20)煤层掘进的巷道两侧煤帮一直采用锚杆加金属网或加竹笆的方式支护。在顶板为4至6米的石灰岩特定的条件下,巷道中所打的锚杆往往因片帮失去作用,而其顶板却长久不坏,完好如初,有的片帮后跨度达10米以上却毫无垮落征兆。因此,我们在二矿庚_(20)—22030泄水巷和二矿青年煤矿试验裸体巷道,到目前为止已经在3000多米巷道中进行了试验,其效果均较好,不仅省工省时,节约了大量支护材料,而且避免了掘进中的片帮事故,使安全更加可靠。
Pingdingshan No.2 Since the development of G group coal in 1974, all the coal gangues on both sides of the roadway heading along Geng (20) seam have been supported by bolting with metal mesh or bamboo fence. Under the specific conditions of limestone whose roof is 4 to 6 meters, the bolt in the roadway often loses its effect due to the piece of stone, while its roof is not bad for a long time. No sign of collapse. Therefore, we tested the nude tunnels in No. 2 mine Geng (20) -22030 Spillway Lane and No. 2 Mine, so far the test has been carried out in more than 3,000 meters of tunnels. The effect is good, not only saving labor and time, Save a lot of support materials, but also to avoid the boring in the film gang accident, make the safety more reliable.