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为有效缓解采空区围岩大冒落引发的动力冲击灾害,以内蒙古东升庙矿为研究对象,分别从吸收冲击能和消波的角度,采用简支梁受冲强度理论、激波管试验、多孔介质空气流动理论,研究垫层的设置厚度。结果表明:根据简支梁受冲强度理论,计算出垫层厚度为9.2 m;根据激波管试验,确定垫层厚度为10 m;根据多空介质空气流动理论,得出垫层厚度为26 m。现场根据工程经验类比法确定出的垫层厚度为20 m,与前2种计算结果相对比,现场设置的垫层厚度能有效缓解冲击灾害;由于选取的模型过于简化,第3种计算结果比现场设置的垫层厚度要大。
In order to effectively mitigate the dynamic impact disaster caused by the big slump of the surrounding rock in the goaf, taking Dongshengmiao mine in Inner Mongolia as the research object, the impact strength, shock wave absorption, Media air flow theory, research cushion thickness. The results show that the cushion thickness is calculated to be 9.2 m according to the impact strength of simply supported beams. The thickness of the cushion is 10 m according to the shock tube test. The cushion thickness is 26 m based on the air flow theory of long and short media. The cushion thickness determined by on-site analogy of engineering experience is 20 m. Compared with the former two kinds of calculation results, the cushion thickness set in the field can effectively relieve the impact disaster. Because the selected model is too simplistic, the third calculation result ratio Set the thickness of the cushion to be large.