Experimental and numerical simulation on impact damage protecting of Tunnel surrounding rock

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (7) : 133-137.

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Experimental and numerical simulation on impact damage protecting of Tunnel surrounding rock

Dai Ren-ping1; Guo Xue-bin2; Gong Quan-mei1; Zhou Shun-hua1; Pu chuan-jin2

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Abstract

Based on the traditional charge stucture of smooth blasting, a new stucture that packed PVC-U material beside blasthole is proposed for protecting tunnel surrounding rock.The working theory of the material in reducing the impact damage toward tunnel surrounding rock is also investigated. For verificating the effect of PVC-U material in decreasing surrounding rock’s damage, the Ф57mm one-stage light-gas gun is used to carried out experiments with the LS-DYNA analysised software dissecting tests’ data. Test’s result indicates that with this protective layer could diminish the stress peak and damage of rock sample’blasting surface. And with same condition of impact velocity,the thicker of the PVC-U material layer, the lower of the blasting surface stress peak value. By using 4mm protective layer,the injury tolerance of rock test specimen reduced 21.1%.Moreover ,the validity of theoretical analysis and test result are also checked by numerical simulation method.And the conclution is that PVC-U material layer in the blast hole can reduce the blasting damage of tunnel surrounding rock.

Key words

Tunnel surrounding rock / impact damage / PVC-U protective layer / One-stage light-gas gun / Numerical simulation

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Dai Ren-ping;Guo Xue-bin;Gong Quan-mei;Zhou Shun-hua;Pu chuan-jin. Experimental and numerical simulation on impact damage protecting of Tunnel surrounding rock[J]. Journal of Vibration and Shock, 2011, 30(7): 133-137