Test method of fractured area of rock slopes under blasting load

doi:10.16265/j.cnki.issn1003-3033.2022.08.1682

Abstract

Abstract:

In order to improve safety of open pit mines during blasting, a determination method of rock blast fracture area was proposed based on embedded test rod. Selection method of test rod material was determined based on propagation theory of explosion stress wave through structural plane and research results of existing explosion rupture gap area, and manufacturing steps and test procedures were provided. Then, blasting test was carried out on site, and range of blasting gap was obtained according to fracture range of test rods, and test results were verified by theoretical analysis method, numerical analysis, and on-site vibration velocity monitoring method. The results show that it is theoretically feasible to obtain fracture area of blasted rock by using embedded test rod, and the maximum horizontal radius of rock slope fracture zone under 10 kg blasting load is 2.95 m. At the same time, the relative errors of three methods and results obtained by field test are less than 24.8%, 18% and 4% respectively.

Key words: blasting load, test method, rock slope, range of blasting fracture zone, Mises yield criterion, test rod

WANG Zhide, LI Jie, WU Haigang, MA Zuyao. Test method of fractured area of rock slopes under blasting load[J]. China Safety Science Journal, 2022, 32(8): 104-110.

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ω	弹性模量 E₂/GPa	泊松比 μ₂	ρ₂/ (kg·m^-3)	σ_c/MPa
0.7	2.31	0.250	1 408.8	4.08
1.0	1.49	0.198	1 127.1	1.65
1.3	1.23	0.169	1 015.4	1.25

ω	n	K	σ_cd2/MPa	σ_cd2/σ_td1
0.7	5.10	0.327	18.930	0.566
1.0	7.09	0.247	7.656	0.229
1.3	8.20	0.217	5.800	0.173