Study on Eccentric Uncoupled Blasting Effect of Cutting Seam Pipe

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