摘要
针对目前高压气体破岩机理研究还不够充足的现状,参考钻爆法中孔壁峰值压力的计算方法,在分析了液氧膨胀破岩法破岩的整个流程后,基于激波管理论,推导了一种不同岩石介质和不耦合系数下液氧膨胀破岩孔壁峰值压力计算模型。通过混凝土模型实验,利用动态应变测试仪测试孔壁峰值压力,在固定膨胀管直径60 mm,在4种不同孔径(75~120 mm)的条件下,进行孔壁峰值压力测试。测试结果表明:在液氧当量与岩石介质条件一致时,仅改变不耦合系数,测得的孔壁压力到达峰值的时间随着不耦合系数的增大而增加,其线性拟合式为t=230.6k-127.85;随不耦合系数的增大,孔壁峰值压力逐渐减小,且衰减程度逐渐放缓;对比孔壁峰值压力测试结果与理论计算结果,得出二者的孔壁峰值压力随不耦合系数的衰减趋势相近,验证了理论计算的可靠性。
Given the current lack of comprehensive research on the mechanism of rock fracturing by high-pressure gas,this study draws upon the research method used to determine peak pressure at the borehole wall in the drilling and blasting method.By analyzing the complete rock fracturing process through the liquid oxygen expansion method,a calculation model for the peak pressure at the borehole wall was derived from the shock tube theory,considering the changes in the rock medium and uncoupling coefficient.Using a dynamic strain tester,a concrete model experiment was conducted to measure the peak pressure at the borehole.Under fixed conditions of a 60 mm expansion tube diameter and four different apertures(75~120 mm),the peak pressure was measured.The test results show that,with the same liquid oxygen equivalent and rock medium conditions,the time to peak pressure increases linearly with the uncoupling coefficient,following the relationship t=230.6k-127.85.As the uncoupling coefficient increases,the peak pressure at the borehole wall decreases gradually,with the attenuation rate gradually slowing.A comparison between the experimental results with the theoretical calculations shows a similar trend in peak pressure attenuation with the uncoupling coefficient,confirming the reliability of the theoretical model.
作者
曾华恒
解叶龙
胡艳
陈必港
魏勇
霍晓锋
ZENG Hua-heng;XIE Ye-long;HU Yan;CHEN Bi-gang;WEI Yong;HUO Xiao-feng(Zijin College of Geology and Mining,Fuzhou University,Fuzhou 350108,China;Institute of Explosive Technology,Fuzhou University,Fuzhou 350108,China;Zhongchang Nuclear Industry(Fujian)Construction Development Co.,Ltd.,Nanping 353200,China;Fujian Transportation Research Institute Co.,LTD.,Fuzhou 350004,China)
出处
《爆破》
北大核心
2025年第2期146-157,共12页
Blasting
基金
国家自然科学基金(52109124)。
关键词
液氧膨胀破岩法
径向不耦合安装
孔壁峰值压力
模型实验
liquid oxygen expansion rock breaking method
radial uncoupled installation
peak hole wall pressure
model experiment
作者简介
曾华恒(2000-),男,福建泉州人,硕士研究生,主要研究方向爆破工程与采矿工程,(E-mail)1377563102@qq.com;通讯作者:霍晓锋(1994-),男,河北平山人,博士、硕士生导师,主要从事采矿工程、爆破工程方面的教学与研究,(E-mail)huoxiaofeng0705@gmail.com。
