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高强度、超高强度锚杆支护系统在提高巷道支护效果、保证巷道安全、简化采煤工作面端头维护工艺等方面具有明显的优越性,十分有利于采煤工作面的快速推进,实现矿井的高产高效。目前,高强度锚杆支护技术已在国内外得到普遍应用,取得了巨大的技术经济效益。然而我国现用金属锚杆结构普遍不合理,导致锚杆支护巷道存在安全隐患和经济上的浪费。主要表现在如下两个方面:第一,锚杆整体延伸量小,不能很好适应围岩的变形,经常发生尾部断裂失效;第二,锚杆材料的有效利用率低,浪费了大
High strength and ultrahigh strength bolt support system has obvious advantages in improving roadway supporting effect, ensuring roadway safety and simplifying the end face maintenance process of coalface, which is very conducive to the rapid advancement of coal mining face, Achieve high productivity and high efficiency of the mine. At present, high strength bolt support technology has been widely used at home and abroad, has made tremendous technical and economic benefits. However, the current structure of metal bolt used in our country is generally unreasonable, which leads to potential safety hazard and economic waste of bolt supported roadway. Mainly in the following two aspects: First, the overall extension of the bolt is small, can not adapt well to the deformation of the surrounding rock, tail failure often occurs; Second, the effective utilization of the bolt material is low, a waste of large