Simulation and Experimental Study on Stress Wave Action of Double Hole Blasting under High Ground Stress Environment

Authors

  • Han Han,Haokai Jiao, Xiliang Zhang,

Abstract

With the increase of the mining depth, the effect of deep high ground stress gradually appears, and the blasting excavation of the rock mass changes from the dynamic load effect of blasting to the coupling effect of the blasting dynamic load and the high geostatic static load. This work took an underground copper mine as a research object, and studied the functional relationship between dynamic load and ground stress by blasting through rock blasting theory. Based on ANSYS /LSDYNA numerical simulation software, the ground stress and 10MPa, 20MPa, 30MPa, 40MPa, 50MPa, simulation study of two-hole blasting under seven kinds of 60MPa stress loading. The results show that after the initial in-situ stress is loaded, the peak value of blasting stress decreases sharply, but the peak value of the blasting stress peak in the reference line 1direction and the reflection stress reference 2direction due to the boundary reflection effect shows a small linear increase. Based on the conclusions of this study, a field comparative test of four groups of double-hole blasting funnels was carried out in a 1500m underground copper mine. The test results show that the blasting action under the initial in-situ stress is consistent with the numerical simulation results. When the initial in-situ stress increases by 49Mpa, the blasting funnel volume increases by 0.05841m3, which is 13.2%. The determination coefficient of the in-situ stress fitting curve R2 reaches 0.9844, further verifying that under the premise that the initial in-situ stress has a strong suppression effect on the blasting dynamic load, as the initial in-situ stress increases, the left-right effect of the blasting will linearly promote.

Published

2020-11-01

Issue

Section

Articles