| 钻孔爆破中环向裂纹形成机理的研究 |
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| 作者单位： | ;1.武汉大学;2.武汉大学;3.广东省惠州市水电建筑工程有限公司 武汉430072;4.武汉430072 |
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| 摘 要： | 通过拉普拉斯变换和Stehfest数值反演方法 ,得到了内爆炸荷载作用下柱形空腔周围弹性岩体介质中的动应力场。研究了爆炸载荷动态卸载对介质中应力分布的影响 ,发现爆炸荷载卸载过程中柱形空腔周围径向应力会由压转拉 ,该径向拉应力导致了钻孔爆破中环向裂纹的形成。此外 ,利用动态卸载效应理论对爆破工程实践中观察到的一些现象作了合理的解释
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| 关 键 词： | 钻孔爆破 环向裂纹 拉普拉斯变换 数值反演 柱形空腔 动态卸载 |
STUDY ON THE MECHANISM OF THE FORMATION OF CIRCUMFERENTIAL CRACKS IN DRILLING-AND-BLASTING |
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| Abstract: | Through Laplace transformation and Stehfest numerical inversion,the dynamic stress field in elastic rock medium around the cylindrical cavity under inner explosion load is calculated The influence of dynamic unloading of explosion load on stress distribution in rock medium is discussed,and it is found that during the unloading process of explosion load,the radial stresses around cylindrical cavity change from compressive stresses to tensile stresses which leads to the formation of circumferential cracks In addition,a reasonable explanation to some phenomena observed in blasting engineering is made using the mechanism of dynamic unloading |
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| Keywords: | Drilling-and-blasting Circumferential cracks Laplace transformation Numerical inversion Cylindrical cavity Dynamic unloading |
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