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背景技术大通矿区岩层主要为灰黑色砂岩、灰黑色泥质页岩、灰白色砂岩及炭质泥岩;以往基岩掘进过程中采用锚网喷支护,由于受复杂地质构造的影响,岩层松软,顶板破碎,造成巷道压力大,变形严重,底板鼓起,维护工程量大且维护困难。在锚喷巷,用锚索加强加固,由于压力大、有渗水,导致钢绞线、来压易剪切折断,无法有效阻止巷道来压。锚网喷支护方式已满足不了安全生产的需求,为加强巷道支护强度,延长巷道的服务
BACKGROUND OF THE INVENTION The rock formations of the Chase mining area are mainly gray-black sandstone, gray-black shale, gray-white sandstone and carbonaceous mudstone. In the past, the bolting and shotcreting support was used in the excavation of the bedrock. Because of the complex geological structure, Broken, resulting in roadway pressure, severe deformation, floor bulging, maintenance of large quantities and maintenance difficulties. In the anchor spray lane, reinforced with anchor cable, due to pressure, water seepage, resulting in strand, easy to shear pressure to break, can not effectively prevent the roadway to pressure. Anchor net spray support can not meet the needs of safe production, in order to strengthen the strength of roadway support, to extend the service tunnel