爆炸荷载作用下模型介质裂纹扩展试验与分析

发布时间：2018-05-31 08:47

本文选题：爆炸力学 + 裂隙介质　；参考：《实验力学》2017年01期

【摘要】：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。
[Abstract]:In order to study the crack propagation law of fractured medium under explosive loading, the organic glass thin plate with artificial fissures is taken as medium, the vertical distance from the center of the hole to the artificial crack L and the length of artificial crack D as variables, respectively. A single detonator explosive loading test model was used to carry out the test. The experimental results show that radial crack, wing crack, spallation crack and quasi spallation crack can be formed by explosive load, and artificial crack can block the propagation of radial crack, and radial crack propagation is more sensitive to distance L than length D. The wing crack is produced by the interaction of the explosion diffraction wave or the diffraction wave with the compression stress wave, and the length of the wing crack decreases with the increase of the distance L. The net tensile stress crack medium formed by the superposition of the incident compressive stress wave and the reflected tensile stress wave forms a spallation effect, which results in the formation of the quasi-spallation effect of the radial crack bending, and the spallation crack and the quasi-spallation crack are almost parallel to the artificial crack. The results can provide theoretical basis for blasting design, rock burst prevention and structural engineering protection of fractured rock mass.
【作者单位】：西南科技大学环境与资源学院;非煤矿山安全技术四川省高等学校重点实验室;四川大学建筑与环境学院;
【基金】：四川省教育厅青年基金项目(项目编号:11ZB194/11ZD1009)
【分类号】：TD235.1

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