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为研究爆炸载荷作用下裂隙介质裂纹扩展规律,以含人工裂隙的有机玻璃薄板为介质,分别以炮孔中心到人工裂隙垂直距离L和人工裂隙长度D为变量,采用单发雷管爆炸加载试验模型进行试验。试验结果表明,爆炸荷载作用将使裂隙介质形成径向裂纹、翼裂纹、层裂裂纹和似层裂裂纹;人工裂隙能够阻隔径向裂纹的扩展,径向裂纹的扩展对距离L比长度D更敏感;翼裂纹是爆炸绕射波或绕射波与压缩应力波共同作用产生的,翼裂纹的长度随距离L增加而降低;入射压缩应力波与反射拉伸应力波叠加形成的净拉伸应力拉裂介质形成层裂效应、引起径向裂纹弯曲形成似层裂效应,层裂裂纹和似层裂裂纹几乎平行于人工裂隙。研究结果可为裂隙岩体爆破设计、冲击矿压防治和结构工程防护等提供理论依据。
In order to study the crack propagation law of cracked medium under blast load, taking the organic glass sheet containing artificial fractures as the medium, the vertical distance L from the center of the blasting hole to the length of artificial fractures L and the length of artificial fractures D were taken as variables. experimenting. The experimental results show that the radial load, the wing crack, the fissure crack and the fissure crack can be formed by the action of explosion load. The artificial fissure can block the propagation of the radial crack. The propagation of the radial fissure increases the distance L more than the length D The wing crack is caused by the combination of the explosive or the diffraction wave and the compressive stress wave. The length of the wing crack decreases with the increase of the distance L. The net tensile stress caused by the superposition of the incident compressive stress wave and the reflected tensile stress wave Cracking the medium to form the splitting effect, causing the radial crack to bend and form the delaminating effect, the splitting crack and the splitting crack almost parallel to the artificial crack. The research results can provide the theoretical basis for the blasting design of fractured rock mass, rock burst control and structural engineering protection.