不耦合装药爆破孔壁压力峰值的实验研究  

Experimental study on the peak pressure of borehole wall in decoupling charge blasting

作　　者：叶志伟 陈明[1,2] 魏东[1,2] 卢文波 刘涛[1,2] 吴亮[3] YE Zhiwei;CHEN Ming;WEI Dong;LU Wenbo;LIU Tao;WU Liang(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,Hubei,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering Ministry of Education,Wuhan University,Wuhan 430072,Hubei,China;Hubei Provincial Intelligent Blasting Technology Research Center,College of Science,Wuhan University of Science and Technology,Wuhan 430065,Hubei,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072 [3]武汉科技大学理学院湖北省智能爆破技术研究中心,湖北武汉430065

出　　处：《爆炸与冲击》2021年第5期1-10,共10页Explosion and Shock Waves

基　　金：国家自然科学基金(51779193,51479147);湖北省技术创新专项重大项目(2017ACA102)。

摘　　要：不耦合装药爆破孔壁压力峰值是控制岩体轮廓成形质量及进行非流固耦合爆破振动响应数值模拟分析的重要参数,本文采用实验方法研究了不耦合装药爆破的孔壁压力峰值:利用材质为20钢的无缝薄壁钢管模拟不耦合装药爆破炮孔,以高灵敏度、高精度的应变片为传感器,选用超动态应变仪采集钢管内置柱状炸药卷爆炸过程中钢管外壁产生的环向应变,应用动荷载作用下薄壁圆筒的动力响应计算方法,反演分析采集的钢管外壁环向应变数据,得到了爆破过程中空气冲击波作用于钢管内壁的冲击荷载压力峰值,间接测量了不耦合装药爆炸后的孔壁压力峰值。实验获得了6种不耦合装药工况下的爆破孔壁压力峰值测试数据,并计算了相应工况下实验值较准静态爆生气体压力的增大倍数,拟合结果表明压力增大倍数随不耦合系数的增大近似呈线性增长。同时也分析了部分试验工况下爆炸测试结果不理想的原因,研究成果可为轮廓爆破孔壁压力峰值的测试与计算提供参考。The peak pressure of borehole wall in decoupling charge blasting is an important parameter to control the quality of rock mass profile forming and to carry out numerical simulation analysis of blasting vibration response of non-fluid-solid coupling.In this paper,the peak pressure of borehole wall in decoupling charge blasting was studied from an experimental perspective.Based on the characteristics that the difference between the two higher wave impedance media,steel pipe and rock,has little effect on the peak pressure of borehole wall,the seamless thin-walled steel pipe made of 20#steel was used to simulate the borehole in decoupling blasting with high-sensitivity-high-precision strain gauge as sensor,four strain gauges arranged along the circumferential direction of a certain section of each steel pipe.Ultrahigh dynamic strainometer was used to collect the circumferential strain of steel pipe during the explosion process of built-in columnar explosive cartridge;the method of calculating the dynamic response of thin-walled cylinder under dynamic load is used to calculate the collected circumferential strain;the elastic dynamic formula of the thin-walled cylinder was used to deduce the collected circumferential strain;and the peak pressure on the borehole wall by the air shock wave has been measured indirectly.The peak pressure on the borehole wall under six working conditions was obtained,and calculated the ratio of the experimental values to the quasistatic gas-pressure under the corresponding working conditions to obtain increase multiples.The decoupling coefficient was taken as the abscissa and the pressure increase multiple as the ordinate for the fitting,the fitting results indicate that the pressure increase multiples increase approximately linearly with the increase of the decoupling coefficients,and the fitting correlation coefficient is as high as 0.99 or more.At the same time,the reasons why the experimental results under some working conditions are unsatisfactory have been analyzed,which can be referr

关 键 词：不耦合装药 孔壁压力峰值 环向应变 动力响应 

分 类 号：O383[理学—流体力学]