摘要
利用非爆炸生成的高能气体破岩是工程实际中常采用的技术手段。为研究高能气体破岩特性,获取影响破岩效果的关键因素,设计一套模拟高能气体产生和冲击过程的试验装置。通过控制压力峰值、加载速度等因素实现对不同特征高能气体破岩作用效果的模拟。设置准静态和瞬态加载对比试验,研究影响高能气体破岩效果的因素。并利用瞬变流理论分析高能气体在该装置中的运动规律和作用于试件钻孔面的有效冲击荷载的压力特征。结合试验结果和理论分析,探索各因素对高能气体破岩效果的影响规律。分析结果表明,高能气体瞬态效应明显,其脉冲压力作用远大于气体膨胀压力作用,且加载速度明显影响冲击破岩的效果。因而在高能气体破岩设计中,当加载峰值受限的情况下,可通过调整加载速度改善破岩效果。
Using non-explosive high-energy gas to break rock is a technical method often used in engineering practice. In order to study the rock-breaking characteristics of high-energy gas and obtain the key factors that affect the rock-breaking effect,an experimental device is designed to simulate the generation and impact of high-energy gas. By controlling the pressure peak,loading speed and other factors,the simulation of the rock breaking effect of high energy gas with different characteristics is realized. A comparative experimental study of quasi-static and transient loading is used to study the influencing factors that affect the rock breaking effect of high-energy gas. The transient flow theory is used to analyze the motion of high-energy gas in the device,and the pressure characteristics of the effective impact load acting on the bore surface of the specimen are analyzed. Combining the experimental results and theoretical analysis,the influence laws of each factor on the rock breaking effect are explored. The analysis results show that the transient effect of high-energy gas is obvious,and the effect of gas pulse pressure is much larger than that of gas expansion pressure,and the loading speed obviously affects the effect of impact rock breaking. Therefore,in the design of high energy gas rock breaking,when the loading peak is limited,the rock breaking effect can be improved by adjusting the loading speed.
作者
陈莉静
冯纪米
吴小超
CHEN Lijing;FENG Jimi;WU Xiaochao(School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an,Shaanxi 710048,China;Wuhan Hanyang Municipal Construction Group Corporation,Wuhan,Hubei 430050,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2020年第S02期3271-3277,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金青年基金资助项目(11002108)。
关键词
岩石力学
高能气体
破岩特性
试验研究
瞬态效应
rock mechanics
high-energy gas
rock breaking characteristics
experimental research
transient effect
作者简介
陈莉静(1975-),女,2006年于西安理工大学岩土工程研究所获博士学位,现任副教授,主要从事岩体动力学和岩土工程数值仿真分析方面的教学与研究工作。E-mail:14210133@qq.com。
