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本文对岩石、锚杆和喷射混凝土相似材料的力学性能进行了试验研究。并对均质岩体中圆形洞室的喷锚支护进行了地质力学模型试验,其中改变了锚杆的间距和长度。试验结果表明,对于软岩,喷锚支护能提高围岩的承载能力,锚杆支护能提高围岩的变形刚度,减少洞室的收敛变形。试验结果还表明,喷锚支护的破坏属剪切破坏。本文试验结果加深了对喷锚支护变形特性和强度特性的认识,对进一步改进喷锚支护的设计计算,提供了一定的实验和理论依据。
In this paper, the mechanical properties of rocks, bolts and similar materials used in shotcrete are experimentally studied. The geomechanical model tests were performed on the injection-anchor support of circular caverns in homogeneous rock masses, which changed the distance and length of anchor rods. The test results show that for soft rock, bolted-anchor support can improve the carrying capacity of surrounding rock. Bolt support can improve the deformation rigidity of surrounding rock and reduce the convergence and deformation of the cavern. The test results also show that the damage of spray-anchor support is shear failure. The test results in this paper deepen the understanding of the deformation characteristics and strength characteristics of spray-anchor support, and provide some experimental and theoretical basis for further improving the design calculation of spray-anchor support.