大直径钻孔卸压对围岩强度与锚固力影响研究
Research on the influence of large diameter borehole pressure relief on surrounding rock strength and anchoring force
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摘要: 为研究大直径钻孔卸压对围岩强度与锚固力的影响作用，利用厚壁理论模型建立实验室试验与现场围岩强度变化的对应关系，为实验室测试提供理论基础；利用数值模拟分析了大直径钻孔对围岩强度的影响作用，得到梁宝寺煤矿3320工作面煤壁钻孔卸压后的围岩强度减弱了20%～25%；通过实验测试，得到了现场使用的锚杆和锚固剂的力学性能；选用PVC、6061铝和20#钢不同材质的套筒分析了不同径向刚度对锚杆锚固力影响，锚固力大小介于55.4～110 kN之间；依据等效径向刚度公式，确定了直径为150 mm的卸压钻孔使锚杆锚固力弱化约为10%，为保持等效的围岩控制程度，支护强度应设计为无卸压钻孔时的1.10倍。Abstract: In order to study the effect of pressure relief of large diameter borehole on surrounding rock strength and anchoring force, according to the thick wall theoretical model, the corresponding relationship between the laboratory experiment and the strength change of surrounding rock in coal mine is established. The influence of large diameter borehole on surrounding rock strength was analyzed by FLAC3D, and it was found that the surrounding rock strength of 3320 working face in Liangbaosi Coal Mine decreased by 20%-25% after pressure relief. The mechanical properties of anchor bolts and anchoring agents used in coal mines are obtained through experimental tests. PVC, 6061 aluminum and 20# steel sleeves were used to study the relationship between different radial stiffness and anchoring force, the anchoring force is between 55.4 kN and 110 kN. According to the equivalent radial stiffness formula, it is determined that the bolt anchorage force weakened is about 10% by the pressure relief drilling with diameter of 150 mm. In order to maintain the equivalent control degree of surrounding rock, the support strength should be designed as 1.10 times of that without pressure relief drilling.
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