盖梦飞,仇安兵,王思杰,陈友荣,罗童,周世均
GAI Meng-fei,QIU An-bing,WANG Si-jie,CHEN You-rong,LUO Tong,ZHOU Shi-jun

• 1:北京科技大学土木与资源工程学院
• 2:重庆中环建设有限公司

摘要(Abstract)：

随着水压爆破的广泛应用，对水压爆破的应变场变化的研究也越来越深入，为对比水、空气2种介质爆炸时应变场的变化，利用水泥砂浆模型试块，建立高速三维数字图像相关试验系统，分析了孔口装空气、孔口装水、孔底装水、孔口孔底装水装药结构爆炸时的应变场分布特征。研究结果表明：孔口孔底装水结构炮孔无论在轴向、横向引起的应变场范围、高应变区间均显著大于其他2种水袋结构炮孔，而无水炮孔应变区范围是最小的；除了在孔口起爆点附近区间，孔底装水结构与孔口孔底装水结构最先到达高应变区、峰值主应变相近外，在相同时刻孔口孔底装水结构在炮孔中部、底部的主应变值均大于其他3种炮孔结构；孔口孔底装水结构爆破时裂纹扩展峰值速度达599.7 m/s,约是孔口空气结构的1.6倍；越靠近试块表面中部位置，主应变越大，扩展速度也越快；对比证明了水压爆破相较于以空气为介质爆破时裂纹产生的时间更早、扩展更快速、致裂效果更好，可为类似工程爆破中提供借鉴和参考。
With the widespread application of water pressure blasting, the research on the strain field changes of water pressure blasting is becoming more and more in-depth. In order to compare the changes in the strain field during the explosion of water and air, a high-speed 3D digital image correlation experimental system was established using cement mortar model test blocks. The strain field distribution characteristics of the explosion structure with air at the orifice, water at the orifice, water at the bottom of the orifice, and water at the bottom of the orifice were analyzed.The research results indicate that the strain field range and high strain range caused by the containing water structure at the bottom of the orifice hole are significantly larger than those of the other 2 types of water bag structure holes in both axial and transverse directions, while the strain zone range of the waterless hole is the smallest; Except in the vicinity of the initiation point at the orifice, the containing water structure at the bottom of the orifice and the containing water structure at the bottom of the orifice first reach the high strain zone, with similar main strain peaks. At the same time, the main strain values of the containing water structure at the middle and bottom of the blasthole are greater than those of the other three types of blasthole structures; The peak crack propagation speed of the containing water structure at the bottom of the hole during blasting reaches 599.7m/s, which is about 1.6 times that of the air structure at the hole opening; The closer it is to the central position of the test block surface, the greater the main strain and the faster the expansion speed; The comparison proves that water pressure blasting produces cracks earlier, expands faster, and has better cracking effects compared to air blasting, which can provide reference and guidance for similar engineering blasting.

关键词(KeyWords)： 水压爆破;数字图像相关方法;应变场;裂纹
water pressure blasting;digital image correlation methods;strain field;crack

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 盖梦飞,仇安兵,王思杰,陈友荣,罗童,周世均
GAI Meng-fei,QIU An-bing,WANG Si-jie,CHEN You-rong,LUO Tong,ZHOU Shi-jun

DOI: 10.19931/j.EB.20220106

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