Search

Copyright of Journal of Drainage & Irrigation Machinery Engineering / Paiguan Jixie Gongcheng Xuebao is the property of Editorial Department of Drainage & Irrigation Machinery Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to explore the rock damage characteristics of air and water uncoupled blasting, the rock damage evolution process, fracture range and peak pressure of hole wall after blasting of five groups of uncoupled coefficient models were analyzed by numerical simulation. Finally, field tests were carried out to verify the numerical simulation results. The results show that with the increase of radial uncoupling coefficient, the attenuation of rock damage area caused by air uncoupling blasting is more obvious. The initial shock wave energy produced by the water-uncoupled blasting is larger, and the energy utilization rate in the propagation process is higher. Due to the almost incompressibility of the water medium, the energy can act on the hole wall more smoothly and evenly. Under the condition of the same uncoupling coefficient, the peak pressure of the hole wall after water uncoupling blasting is larger, but the water medium can produce better protection effect on the hole wall, and the effect is better after the tunnel smooth blasting test. The above research can provide a certain reference for the selection of tunnel smooth blasting charge structure. [ABSTRACT FROM AUTHOR]

Copyright of Refractories / Naihuo Cailiao is the property of Naihuo Cailia (Refractories) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Nonferrous Metals Engineering is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)