爆生裂纹与层理缺陷相互作用的实验研究

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摘要为了研究爆生裂纹与层理缺陷的相互作用机制，采用新型数字激光动态焦散线实验方法对含层理岩体在爆炸载荷下的动态断裂行为进行了实验分析。实验结果表明：在爆炸载荷下，当炮孔切槽方向与层理面存在一定夹角θ时，爆炸使层理岩体裂纹扩展分为爆生主裂纹、界面裂纹、次生裂纹三个阶段。爆生主裂纹扩展到层理面后，不是直接贯通层理面沿原方向继续扩展，而是产生界面裂纹之后再继续扩展，产生的界面裂纹长度随夹角θ增大而减小。裂纹扩展贯通层理后，次生裂纹继续扩展，随夹角θ的增大，次生裂纹扩展长度逐渐增大。爆生主裂纹扩展过程中，随着爆生主裂纹尖端至层理面距离的减小，爆生主裂纹尖端动态应力强度因子和裂纹扩展速度均逐渐减小，说明层理面对爆生主裂纹的扩展起阻碍作用，且夹角θ越大阻碍作用越明显。

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	岳中文?
	胡庆文
	陈彪

关键词 ：焦散线, 层理岩体, 爆炸荷载, 动态应力强度因子

Abstract：For the purpose of studying the interaction between blast-induced cracks and bedding defects , the new digital-laser dynamic caustic system is utilized to investigate the fracture behavior of bedding rock under explosive load. The results shows that, under explosive load, when there is a certain angle θ between the grooving direction of blast hole and the bedding surface, the crack propagation of bedding rock is divided into three stages: the main blast-induced crack, the interface crack and the secondary crack . After the main blast-induced crack propagates to the bedding surface，rather than passing through in the original direction, it causes the initiation of the interface crack before its redevelopment. The length of interface crack decrease with the increase of the angle θ. The secondary crack keeps on developing after the transversal of the crack propagation in the bedding surface. With the increase of θ, the extended distance of the secondary crack rises gradually. During the main blast-induced crack propagation, the crack propagating velocity and the dynamic stress intensity factor (DSIF) of crack tip decline gradually with the decrease of the distance between the bedding surface and main crack tip, indicating that bedding surface has a resistant effect on the main blast-induced crack propagation and such effect the stronger with the increase of the angle θ.

Key words： Caustic Bedding rock Blasting load Dynamic stress intensity factor

收稿日期: 2016-07-28 出版日期: 2017-06-15

引用本文:

岳中文?，胡庆文，陈彪. 爆生裂纹与层理缺陷相互作用的实验研究[J]. 振动与冲击, 2017, 36(12): 99-104.
YUE Zhong-wen，HU Qing-wen，Chen Biao. The experimental study of the interaction between the blast-induced crack and the bedding defect. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(12): 99-104.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I12/99

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