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随着开采深度的增加,深部巷道支护问题也日益严重。本文对曲江运输巷道的变形特征进行了详细调查,并通过岩体结构、地应力、支护形式和施工因素等几个方面对其变形机制进行了分析。结果表明:不良的岩体结构和高地应力是巷道变形的内在因素,锚网的支护强度和支护刚度、梯形梁的较低护表能力,以及锚杆和爆破等施工质量是巷道变形的外在因素,在内外因素的共同作用下,导致了巷道变形和破坏。在此基础上,提出了锚注+U29圆形棚架联合支护加固技术。数值模拟和井下试验效果分析表明:该支护方式能很好的保持巷道的稳定性,并为深部巷道支护技术的研究提供了有价值的借鉴意义。
With the increase of mining depth, the problem of deep roadway support is also getting worse. In this paper, the deformation characteristics of the Qujiang transport laneway are investigated in detail, and the deformation mechanism is analyzed through the rock mass structure, in-situ stress, supporting forms and construction factors. The results show that poor rock mass structure and high ground stress are the intrinsic factors of roadway deformation. The supporting strength and supporting rigidity of anchor net, the low retaining ability of trapezoidal beam, and the construction quality of bolt and blasting are the deformation of the roadway External factors, under the combined effect of internal and external factors, led to the deformation and destruction of the roadway. On this basis, proposed anchor injection + U29 circular scaffolding combined support reinforcement technology. The results of numerical simulation and downhole test show that the support method can well maintain the stability of the roadway and provide a valuable reference for the research of deep roadway support technology.