In order to study the blasting effect and the damage to the rock mass when the cutting seam cartridge is eccentrically and uncoupled. The ANSYS/LS-DYNA^® nonlinear dynamic platform was used to simulate the blasting effect of five eccentric uncoupled coefficients on the cutting seam cartridge, and the crack growth process under the condition of complete eccentricity was simulated. By comparing and analyzing the stress of measuring points in the direction of cutting seam, vertical cutting seam direction, and circumferential cutting seam pipe under different working conditions. It is concluded that the effect of detonation products is affected by the wrapping property of the cutting seam pipe and the eccentric uncoupled coefficient. With the increase of the eccentric uncoupled coefficient, the load distribution presents obvious non-uniformity. The pressure on the uncoupled side of the blasthole is smaller than that on the coupled side, and the peak time of the uncoupled side also lags behind that on the coupled side. When the eccentric uncoupled coefficient is 1, the peak pressure on the coupled side is 5.78 times that of the uncoupled side, and the explosive stress field is biased toward the coupled side. The existence of the cutting seam pipe causes stress concentration at the opening, which enhances the guiding effect of the initial crack, and the stress in the non-cutting seam direction is buffered. Therefore, the eccentric arrangement of the cutting seam pipe determines the formation of the initial crack and the subsequent blasting effect. When the cutting seam cartridge is arranged eccentrically and uncoupled, it will cause under-excavation at the connection direction of blasthole, which will cause less disturbance to the rock mass on the uncoupled side. If the retaining side rock mass is on the coupled side in actual blasting, the eccentric uncoupled arrangement will cause greater over-excavation and damage. Therefore, it is necessary to avoid this situation as far as possible and provide better guidance for the actual construction.

中文翻译：

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割缝管偏心非耦合爆破效果研究

为了研究爆破效果和切缝夹头偏心分离时对岩体的破坏。在ANSYS / LS-DYNA ^®利用非线性动力平台模拟了五个偏心非耦合系数对切缝刀架的爆破效果，并模拟了在完全偏心条件下的裂纹扩展过程。通过比较和分析不同工况下切缝方向，垂直切缝方向和周向切缝管的测量点应力。得出的结论是，爆破产物的效果受切缝管的包裹性和偏心解耦系数的影响。随着偏心解耦系数的增加，载荷分布呈现出明显的不均匀性。爆破孔非耦合侧的压力小于耦合侧的压力，并且未耦合侧的峰值时间也落后于耦合侧的峰值时间。当偏心非耦合系数为1时，耦合侧的峰值压力是非耦合侧的峰值压力的5.78倍，爆炸应力场偏向耦合侧。割缝管的存在会引起开口处的应力集中，从而增强了初始裂纹的导向效果，并且缓冲了非割缝方向上的应力。因此，切割接缝管的偏心布置决定了初始裂纹的形成和随后的爆破效果。当割缝夹头偏心松开布置时，会在爆破孔的连接方向上引起开挖不足，从而对开松侧的岩体产生较小的干扰。如果在实际爆破中，挡土石方位于耦合侧，则偏心非耦合布置将导致更大的过挖和损坏。因此，有必要尽可能避免这种情况，并为实际施工提供更好的指导。