地下矿山大型机械化高效喷锚支护技术应用研究

通过对喷锚支护机理进行分析，得出喷锚支护失效的主要原因在于喷锚支护的刚度和极限变形量与围岩不匹配。针对矿区岩体松散破碎的特点及当前锚网支护方式存在的问题，开展了一系列机械化湿喷混凝土与树脂锚杆联合支护的工业性试验研究。首先，完成了聚丙烯纤维混凝土合理配比及抗压、抗拉等指标的试验，并确定了主斜坡道最佳喷层厚度为68~90 mm。其次，通过引进φ25 mm×2 400 mm树脂锚杆，采用全长锚固方式，逐步替代管缝式锚杆。实现了Boomer282双臂凿岩台车的机械化锚杆安装。两种支护方式的技术经济对比分析表明，湿喷混凝土与树脂锚杆相结合的支护形式每米支护成本相对较低、工程质量更可靠，尤其适用于松散破碎岩层中的巷道掘进支护。

Research on the Application of Large Efficient Mechanized Shotcrete-Bolt Support Technology in Underground Mine

Based on the mechanism analysis of shotcrete-bolt support, the main cause of support failure was found to be the mismatch between its stiffness and ultimate distortion and the wall rock. In light of the characteristic of loose rockmass and existing problems of bolt-mesh support, a series of industrial tests on mechanized support technology of wet-mix shotcrete and resin bolt were conducted. Firstly, the reasonable proportion, tensile strength and compressive strength of polypropylene fiber concrete (PFC) were obtained, and the optimal shotcrete thickness of main decline was determined to be 68~90 mm. Secondly, φ25 mm×2 400 mm resin bolts with full-size anchorage were introduced gradually instead of spilt set. High efficiency mechanized bolt installation was carried out by Boomer 282 jumbo. The techno-economical comparative analysis indicates that the united support of wet-mix shotcrete and resin bolts has a smaller support cost per meter and more reliable engineering quality, especially applicable for tunnel development support in loose and broken rock.