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| Numerical Analysis and Application of Elliptical Bipolar Linear Energy-gathering Hydraulic Control Blasting Based on SPH-FEM |
| WU Bo, LI Hualong, MENG Guowang, XU Shixiang, ZHANG Jinglong, CUI Yaozhong |
| Guangxi University, Nanning, Guangxi 530004, China |
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Abstract Research purposes: To reduce the influence of blasting activities on the tunnel environment, reducing the concentration of dust generated during blasting, while enhancing the blasting effect on the excavation area, the energy-gathering hydraulic blasting is often used. This paper simulates and verifies the gradual evolution process of the elliptical bipolar linear energy-gathering hydraulic blasting through numerical simulation and field engineering experiments in Jinjing railway tunnel, and analyzes the action mechanism and damage evolution process of energy-gathering hydraulic blasting.
Research conclusions: (1) The development of cracks near the borehole has a certain tendency under the energy-gathering hydraulic blasting, enhancing the crack propagation in the energy gathering direction while restraining the development of cracks in other directions. It can enhance the blasting effect in the borehole by adding water. (2) By comparing hydraulic blasting three forms energy-gathering structure, the damage caused by the upper hydraulic energy-gathering blasting structure is mainly concentrated near the borehole, and the lower hydraulic energy-gathering blasting structure causes great damage to the hole bottom. And the damage area produced by the two-way hydraulic energy-gathering blasting structure is uniform, the falling stones have a higher degree of crushing, and the water medium can reconcile and neutralize the dust generated during the blasting process. (3) According to the above, the best blasting effect can be achieved by the construction of two-way hydraulic energy-gathering hydraulic control blasting of tunnel construction.
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Received: 13 August 2021
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2022, Vol. 39 
