Tests for damage and failure characteristics of coal thickness variation area under blasting load

ZHU Fei-hao1,2,LIU Zegong1,2,GAO Kui1,2, LIU Jian1,2

Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (3) : 141-148.

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (3) : 141-148.

Tests for damage and failure characteristics of coal thickness variation area under blasting load

  • ZHU Fei-hao1,2,LIU Zegong1,2,GAO Kui1,2, LIU Jian1,2
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Abstract

Aiming at the fact that coal and gas outbursts are easily induced in regional blasting construction of geological structures, an elastic mechanical model of coal and rock combination was established.Based on propagation and action laws of blast stress waves in coal and rock medium, distribution features of the original rock stress during coal seam thickening and propagation process of explosion stress waves in tectonic coal rock mass were analyzed.Using similar analog tests combined with numerical simulations, the damage and failure characteristics of coal thickness variation zones under blast loading were studied.The results of tests and simulations showed that the original rock stress withstood by thin coal seam is higher than that withstood by thick coal seam, and the stress change gradient increases with increase in coal thickness reduction rate; when blast stress waves propagate from rock body to tectonic coal body, wave transmission and reflection phenomena occur; the reflection-induced tensile wave aggravates the damage level of rock body side of coal-rock interface; stress curves acquired from blast analog tests indicate, the stress waves mutually act to form a superposed failure zone at the rock body of the coal thickness variation area, the failure zone makes blast-induced cracks in other directions extend to it and gather to cause serious failures of the rock body, the tensile stress in the failure zone has 2 larger peak values; the numerical simulations verify transmission and reflection phenomena of blast stress waves at the interface of coal and rock; the stress cloud diagram indicates, the superposition action of stress waves in the coal thickness transition region is the most obvious and lasts long time.The study results provided a meaningful guide for revealing the mechanism of blasts to disturb a coal thickness variation area and induce coal and gas outbursts.

Key words

coal thickness variation / explosion stress wave / crack evolution / coal and gas outburst / stress wave superposition

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ZHU Fei-hao1,2,LIU Zegong1,2,GAO Kui1,2, LIU Jian1,2. Tests for damage and failure characteristics of coal thickness variation area under blasting load[J]. Journal of Vibration and Shock, 2019, 38(3): 141-148

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