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| Numerical simulation study of borehole wall pressure and rock dynamic response under eccentric uncoupled charge |
| JIN Yang1, YAO Yingkang1*, LIU Wen1, JI Fuquan2, CAO Ang2
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1. State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, Hubei, China;
2. CCCC Second Harbour Engineering Co., Ltd., Wuhan 430040, Hubei, China |
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Abstract The blasting characteristics of eccentric charging structures were investigated to achieve full utilization and precise control of explosive energy. The borehole wall pressures and rock dynamic responses during eccentric charge blasting under various uncoupling coefficients were analyzed using ANSYS/LS-DYNA numerical simulation software. Three-dimensional numerical models were established to investigate borehole wall pressures, rock damage, and changes in seismic wave energy flux. Uncoupling coefficients of K=2.0, 1.56, and 1.25 under eccentric charging conditions, along with K=1.0 under concentric charging conditions, were examined. Results showed that under eccentric charge conditions, the difference between peak borehole wall pressures on the coupled and uncoupled sides of the charged section was increased with the uncoupling coefficient. The peak pressure on the coupled side of the borehole wall was measured to be approximately 4 to 11 times greater than that on the uncoupled side. The borehole wall pressures on the coupled and uncoupled sides of the uncharged section located farther from the charged section were observed to remain largely unaffected by the eccentric charging structure. While the pressure difference between the coupled and uncoupled sides at the same location was found to be minimal, the borehole wall pressure was observed to continue decreasing with increasing uncoupling coefficients. The eccentric effect was observed to manifest in the damage zones of both charged and uncharged sections within the eccentric charging structure. The fissure zone volume was measured to be 8 to 15 times greater than that of the crushed zone. A decrease in both the fissure zone volume and the peak seismic wave energy flux was observed with increasing uncoupling coefficients.
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Published: 19 September 2025
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