不耦合装药爆破孔壁压力峰值的实验研究

作者：Ye Zhiwei; Chen Ming^*; Wei Dong; Lu Wenbo; Liu Tao; Wu Liang

来源：Explosion and Shock Waves, 2021, 41(5): 055201.

DOI：10.11883/bzycj-2020-0004

• Borehole peak pressure
• Circumferential strain
• Decoupling charge
• Dynamic response

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 quasi-static 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 referred to the measurement and calculation of the peak pressure of borehole wall in contour blasting. ? 2021, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.

• 单位
  水资源与水电工程科学国家重点实验室; 武汉科技大学