| 预裂爆破作用下岩石裂纹动态应力强度因子分析 |
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| 引用本文： | 吴 亮,卢文波.预裂爆破作用下岩石裂纹动态应力强度因子分析[J].岩土力学,2006,27(Z2):791-794. |
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| 作者姓名： | 吴 亮 卢文波 |
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| 作者单位： | 武汉大学 水资源与水电工程科学国家重点实验室，武汉 430072 |
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| 基金项目： | 国家自然基金(No. 50639100)。 |
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| 摘 要： | 通过有限元分析软件ANSYS数值模拟手段，分析了爆破荷载作用下，裂纹长度与类型、不同的装药量对裂纹尖端动态应力强度因子的影响以及预裂与光面爆破动态应力强度因子比较分析，计算得出：预裂爆破预裂缝的产生主要是从炮孔处产生的开口裂纹在冲击波以及爆生气体的作用下扩展形成的；随着药径与孔径比的增大，动态应力强度因子也逐渐增大，动态应力强度因子曲线形态不变；由于自由面的存在，光面爆破裂纹应力强度动态因子后续峰值较预裂爆破的大。
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| 关 键 词： | 预裂爆破 动态应力强度因子 爆破荷载 光面爆破 |
| 收稿时间： | 2006-06-27 |
Analysis of dynamic stress intensity factor of rock crack
under pre-split blasting loading |
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| WU Liang,LU Wen-bo.Analysis of dynamic stress intensity factor of rock crack
under pre-split blasting loading[J].Rock and Soil Mechanics,2006,27(Z2):791-794. |
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| Authors: | WU Liang LU Wen-bo |
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| Institution: | State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China |
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| Abstract: | The finite element software of ANSYS is employed to analyze the influence of rock crack length and type, different diameters of explosive, pre-split blasting and smooth blasting on dynamic stress intensity factors of crack-tip. The results indicate that the pre-split slot is extended mainly from the crack at the blasting hole under the blasting shock wave and detonation gas loading; with the increase of the diameter ratio of explosive to blasting hole, the dynamic stress intensity factor increases; but the curve form of dynamic stress intensity factor keeps unchangeable; the later peak value of smooth blasting is greater than that of pre-split basting because of the existence of free face. |
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| Keywords: | pre-split blasting dynamic stress intensity factor blasting loading smooth blasting |
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