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| Fine numerical simulation of row-hole blasting in tunnel excavation |
| GUAN Zhenchang1, ZHU Lingfeng1, YU Bolin2 |
1.College of Civil Engineering, Fuzhou University, Fuzhou 350116, China；
2.Fuzhou Urban Construction and Development Co., Ltd., Fuzhou 350003, China |
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Abstract Here, aiming at common surrounding rock conditions and blast hole types in tunnel blasting excavation, five kinds of blast hole fine models were established on LS-DYNA numerical platform, and the fluid-structure interaction algorithm was used to simulate the transient process of row-hole blasting.Firstly, the pressure crushing zone was formed instantly around blast hole, and the initial crack was continuously expanded due to action of air wedge to form the surrounding rock fracture zone.Then the detonation pressure wave was reflected at free face, and its reflected tensile wave made a large range of parallel cracks appear on surrounding rock near free face.Finally, radii of the crushing zone and fracture zone were about 3-4 times and 22-24 times of blast hole radius, respectively.The pressure time history curve on the boundary of blast hole crushing zone received attention, it was shown that obvious multi-peak form including the first peak, the second one and negative one appear; the main peak value and the axial decoupling coefficient have a power exponential decay relationship; if averaging peak pressures on blasting contours, the simplified triangle shape load on each blasting contour can be obtained, it can be applied in the following work, such as, far-field vibration effect evaluation.
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Received: 10 March 2020
Published: 15 June 2021
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