单向静压下柱状炮孔端部爆生裂纹的扩展规律

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摘要高地应力对岩层地下工程爆破动态断裂过程有重要影响。采用数字激光动态焦散线测试系统，研究了不同单向静压下柱状炮孔端部爆生裂纹动态断裂行为，明确了柱状炮孔端部爆生裂纹的扩展规律。结果表明：单向静压越大，端部裂纹平均扩展长度越短，但单向静压下端部裂纹尖端积聚能量的快速释放会导致裂纹初始扩展速度提升；裂纹尖端应力强度因子基本随单向静压增加而递减，单向静压越大，应力强度因子随时间下降越剧烈，裂纹的止裂韧度越高，止裂时间越早；单向静压作用下的爆生裂纹在整个扩展阶段基本表现为I型裂纹，无静压作用下爆生裂纹在扩展初期表现为I型裂纹，中后期表现为复合型裂纹。研究结果对认识静压作用下的柱状炮孔端部破坏机理具有一定意义。

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	李清1
	徐文龙1
	郭洋2
	张正1
	吕晨1
	陶雨1

关键词 ：柱状炮孔, 单向静压, 焦散线, 端部裂纹扩展

Abstract：High crustal stress has important influences on blasting dynamic fracture cause of rock stratum underground engineering. Here, a digital laser dynamic caustics testing system was used to study dynamic fracture behavior of blast cracks at end of a cylinder blasthole under different uniaxial static pressures, and clarify blast cracks’ propagation law. The results showed that the larger the uniaxial static pressure, the shorter the average propagation length of end cracks, but fast release of accumulated energy at end crack tip under uniaxial static pressure causes increase in crack initial propagation velocity; crack tip stress intensity factor drops with increase in uniaxial static pressure; the larger the uniaxial static pressure, the more sharp the drop of the stress intensity factor with increase in time, the higher the crack arrest toughness, and the earlier the crack arrest time; the basic behavior of blast crack under uniaxial static pressure is mode-I one in whole propagation stage, that of blast crack without static pressure is also mode-I one in its initial propagation stage, and composite type one in middle and late propagation stages; the results are meaningful for understanding the failure mechanism of cylinder blasthole end under static pressure.

Key words： cylinder blasthole uniaxial static pressure caustics end crack propagation

收稿日期: 2018-12-20 出版日期: 2020-06-28

引用本文:

李清1，徐文龙1，郭洋2，张正1，吕晨1，陶雨1. 单向静压下柱状炮孔端部爆生裂纹的扩展规律[J]. 振动与冲击, 2020, 39(13): 91-96.
LI Qing1， XU Wenlong1， GUO Yang2， ZHANG Zheng1， L Chen1， TAO Yu1. Propagation law of blasting crack at end of cylinder blasthole under uniaxial static pressure. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(13): 91-96.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I13/91

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