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本文研究了超前围壁锚杆支护结构与作用机理。现场观测表明,在破碎易冒落岩层(井下实测岩体抗压强度约在12×10~5Pa,抗剪强度在5×10~5Pa以下,而且用一般方法不能取出岩石试样的岩层)中,超前围壁锚杆对破碎岩层起到固结岩石、增强整体性和提高岩体抗拉强度的作用。表文在一定的假设条件下,分析了巷道在爆破前、爆破中和爆破后不同时期超前围壁锚杆作用机理,提出了刹杆、护壁以及组合拱结构模型和相应的计算公式,并从安全角度计算了这三种结构的最小承载力。
This paper studies the supporting structure and action mechanism of advanced surrounding rock bolt. The field observations show that in the crushing and easy-falling rock formation (the measured compressive strength of underground rock mass is about 12 × 10 ~ 5Pa, the shear strength is below 5 × 10 ~ 5Pa, and rock samples can not be removed by ordinary methods) , The leading wall anchor on the broken rock play a consolidation of rock, enhance the integrity and improve the tensile strength of rock mass. Under some assumptions, the paper analyzes the action mechanism of roadway ahead of blasting, blasting and blasting at different periods and puts forward the model of the brake lever, the protection wall and the composite arch structure and the corresponding formulas, and from The minimum bearing capacity of these three structures has been calculated from the safety point of view.