切槽孔爆炸载荷下裂纹扩展行为的实验研究

doi:10.13722/j.cnki.jrme.2015.0497

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摘要为了研究切槽孔爆炸载荷下扩展裂纹和空孔相互作用规律，采用动态焦散线实验系统，分别对单炮孔和双炮孔爆炸载荷下含圆孔缺陷的PMMA材料的爆生裂纹扩展行为进行研究。研究结果表明：(1) 单炮孔爆炸载荷下，切槽孔爆生主裂纹扩展轨迹平直，直接与空孔相互贯通，空孔导向效应明显。爆生主裂纹表现为I型模式。(2) 双炮孔同时爆破过程中，切槽孔爆生主裂纹由于受空孔和相对扩展裂纹的影响，扩展轨迹较弯曲，空孔处产生的2条翼裂纹分别与爆生主裂纹贯通。(3) P波前缘压应力波与爆生主裂纹相互作用时，爆生主裂纹扩展速度和动态应力强度因子呈现减小变化的趋势。实验研究结果对于岩体定向断裂控制爆破工程实践具有一定的借鉴意义。

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关键词 ：岩石力学, 切槽孔, 动态焦散线, 定向断裂控制爆破, 爆生裂纹

Abstract：In order to study the interaction between the blast-induced cracks and an empty hole under blasting load in notched boreholes，the blast-induced crack initiation and propagation in PMMA material with a circular empty hole under blasting load was studied with the digital laser dynamic caustics experimental system. During a simple borehole blasting，the blast-induced crack from a notched borehole B had a straight path，directly met the empty hole in the propagating process，was mostly in the tension stress field and grew as mode I. In the simultaneous blasting with two notched boreholes，the interaction between the empty hole and the main blast-induced cracks affected the main blast-induced crack propagation，and the two main blast-induced cracks were respectively coalesced with two blast-induced wing cracks. The propagation speed and dynamic stress intensity factor were reduced with the interaction between the compressive stress waves of P waves in explosive stress waves and the propagating cracks.

Key words： rock mechanics notched boreholes dynamic caustics directional fracture-controlled blasting blast-induced cracks

引用本文:

岳中文，郭洋，王煦. 切槽孔爆炸载荷下裂纹扩展行为的实验研究[J]. 岩石力学与工程学报, 2015, 34(10): 2018-2026.
YUE Zhongwen，GUO Yang，WANG Xu. EXPERIMENTAL STUDY OF CRACK PROPAGATION UNDER BLASTING LOAD IN NOTCHED BOREHOLES. , 2015, 34(10): 2018-2026.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.0497 或 http://www.rockmech.org/CN/Y2015/V34/I10/2018

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