摘要
为了研究爆破震动作用下高地应力巷道的动力响应特征及其稳定性,以淮南潘三矿超前预裂卸压爆破扰动瓦斯综合治理巷为工程背景,通过理论分析建立了爆破作业扰动巷道围岩模型,并根据应力波传播理论及波前动量守恒定理推导出了爆破震动作用下巷道围岩振动方程。使用数值模拟研究了巷道围岩质点峰值振动速度(Peak Particle Velocity,PPV)的衰减特征,从应力分布规律的角度对理论分析进行了补充,并根据模拟结果对巷道围岩稳定性进行了分析。结果表明:巷道围岩振动方程显示,爆炸应力波入射角度的不同会导致巷道围岩不同区域的动态响应特征存在差异。随着爆心距增大,巷道轮廓面附近围岩PPV出现波动,并在自由面处获得最大峰值振速;地应力对巷道围岩PPV具有抑制作用,地应力越大抑制作用越明显,且不同位置围岩的PPV对地应力敏感度存在差异;随着地应力增大,爆破震动作用下巷道围岩受力状态从拉剪变为压剪,最大主应力和剪切应力也随之增大。研究认为随着埋深增加,在对爆破震动作用下巷道围岩的稳定性进行评估时地应力因素不可忽略。对于潘三矿超前预裂卸压爆破工程现场而言,除了巷道的直墙外,墙角、拱墙也是危险区域,应当着重予以加固并加强监测。
To investigate the dynamic response characteristics and stability of a high in-situ stress roadway rock enclosures under blasting vibrations,the comprehensive gas management lane of Pan San Mine in Huainan is used as the engineering background.The research method of theoretical analysis of the blasting operation disturbing the roadway envelope rock model is established.Based on the stress wave propagation theory and the wave front momentum conservation theorem,the vibration equations for the roadway envelope under blasting vibration are derived.The theoretical analysis is then supplemented by the use of numerical simu-lation research methods from the perspectives of PPV(Peak Particle Velocity)attenuation characteristics and stress distribution patterns of the roadway envelope.The stability of the roadway envelope is analyzed based on the simulation results.Differences in the angle of incidence of blast stress waves lead to different dynamic response characteristics in different areas of the roadway enve-lope.These conclusions are drawn from the roadway envelope vibration equations.As the burst core distance increases,the PPV of the surrounding rock near the profile face of the roadway fluctuates and the maximum peak vibration velocity is obtained at the free face.In-situ stress has a suppressive effect on the PPV of the roadway envelope.The greater the ground stress is,the more ob-vious the suppressive effect will be.There are differences in the sensitivity of the PPV of the envelope to ground stress at different locations in the roadway.As the magnitude of the in-situ stress increases,the force state of the roadway envelope under blast vibra-tion changes from tensile shear to compressive shear,and the maximum principal and shear stresses increase.The study reaches the conclusions that as the depth of burial increases,the ground stress factor cannot be ignored when assessing the stability of the tunnel envelope under blasting vibration.In addition to the straight walls of the roadway,the corners and arch walls ar
作者
乔国栋
刘泽功
高魁
刘健
傅师贵
QIAO Guo-dong;LIU Ze-gong;GAO Kui;LIU Jian;FU Shi-gui(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230031,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2024年第3期414-422,共9页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(52074013,52374179)
华能集团总部科技项目能源安全技术专项(HNKJ20-H87)
合肥综合性国家科学中心能源研究院项目(21KZS216)
安徽省教育厅高校研究生科研基金资助项目(YJS20210396)
安徽省教育厅高校自然科学基金资助项目(KJ2020A0327)
安徽理工大学2022年研究生创新基金项目(2022CX1003)
安徽省自然科学基金资助项目(2208085ME125)。
关键词
地应力
动力响应
爆破震动
围岩失稳
质点峰值振动速度
in-situ stress
dynamic response
blasting vibration
surrounding rock instability
peak particle vibration velocity
