摘要
为探究CO_(2)相变致裂应力波传播及影响规律,基于自主研发的三向应变测试装置,设计了CO_(2)相变致裂应力波测试方案。利用动态应变测试系统采集CO_(2)相变致裂过程中的应变信号,分析了CO_(2)相变激发的应力波在岩体中的传播与影响规律。研究结果表明:射流方向和垂直射流方向的峰值应力随传播距离的增大均呈指数型衰减,射流方向峰值应力大于垂直射流方向的峰值应力;CO_(2)充装量与定压剪切片厚度是影响CO_(2)相变致裂应力波的重要因素,剪切片厚度一定时,峰值应力随CO_(2)充装量增加而增大,但增大速率逐渐降低;CO_(2)充装量一定时,峰值应力随剪切片厚度增加而增大,且呈持续增长趋势。
The stress wave induced by CO_(2) phase transition can be used to generate rock fractures.It is important to investigate the propagation and influence law of this stress wave.Based on the self-developed triaxial strain testing device,a testing scheme was designed by utilizing a dynamic strain measurement system to collect strain signals during CO_(2) phase transition and rock fracturing.The research results indicate that the peak stress in the jet direction and perpendicular to the jet direction decays exponentially with the increase of propagation distance,and the peak stress in the jet direction is significantly greater than that perpendicular to the jet direction.CO_(2) filling amount and shear sheet thickness are important factors affecting the peak stress for CO_(2) phase transition fracturing.When the shear sheet thickness is constant,the peak stress increases with the increase of CO_(2) filling amount,but the increasing rate decreases gradually.Similarly,while the CO_(2) filling amount is constant,the peak stress increases with the increase of shear sheet thickness,showing a continuous growth trend.
作者
何志坚
张诗童
蒋楠
罗学东
雷宇
HE Zhi-jian;ZHANG Shi-tong;JIANG Nan;LUO Xue-dong;LEI Yu(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;Greentown China Holdings Limited,Hangzhou 310012,China;Hubei Key Laboratory of Blasting Engineering,Jianghan University,Wuhan 430024,China)
出处
《爆破》
CSCD
北大核心
2022年第3期133-138,共6页
Blasting
基金
国家自然科学基金资助项目(42072309)
爆破工程湖北省重点实验室开放基金资助项目(HKLBEF202002)。
