Abstract
In view of the coal and gas outburst accidents occur frequently caused by blasting in geological structural belt, in order to study the mechanical characteristics of coal rock in tectonic belt disturbance by blasting and blasting vibration effect influenced on the stability of surrounding rock, coal–rock damage and failure characteristics within a reverse fault caused by a blasting stress wave were investigated using numerical analyses and experiments. According to the experimental results, the causes of coal and gas outburst dynamic disasters within a reverse fault during blasting are analyzed. The outcomes indicated that the crushing circle created by the crack propagation near the blasting hole severely damaged the fault plane and floor rocks adjacent to the footwall of the reverse fault. Fractures also extended to the upper and lower coal seams of the reverse fault; this caused the surface of the coal seam to fall off and severe internal damage. According to theoretical analysis, the reflection of the blasting stress wave propagating to the reverse fault intensified the damage to coal and rock. Elastic strain energy accumulation within the reverse fault structural zone was accompanied by high-stress concentration. The reverse fault tectonic region was destroyed by blasting vibration. It increased gas pressure and caused a weak surface, which provided a channel for gas flow and a dynamic basis for the occurrence of coal and gas outburst. The research results have important theoretical value to reveal the mechanism of coal and gas outburst in tectonic belt induced by blasting.
Highlights
In view of the coal and gas outburst accidents occur frequently caused by blasting in geological structural belt, in order to study the mechanical characteristics of coal rock in tectonic belt disturbance by blasting and blasting vibration effect influenced on the stability of surrounding rock, coal–rock damage and failure characteristics within a reverse fault caused by a blasting stress wave were investigated using numerical analyses and experiments
This study investigated the damage and failure characteristics of coal and rock and their influence on outburst dynamical disasters by combining numerical simulation, similarity experiments, and theoretical analyses to address the problem of coal and rock dynamic evolution within reverse fault tectonic belts under the action of blasting stress waves
The propagation of blasting stress waves was highly influenced by reverse fault structures and fault planes, and the coal seam adjacent to the reserve fault under the wall adjacent to the hole was most strongly disturbed
Summary
Structure and blasting is r are[14]. Limited studies have been conducted on the relationship between blasting and coal and gas outbursts[15]. No in-depth study has been performed on the damage and failure characteristics of coal within structural areas under explosion loads. This study investigated the damage and failure characteristics of coal and rock and their influence on outburst dynamical disasters by combining numerical simulation, similarity experiments, and theoretical analyses to address the problem of coal and rock dynamic evolution within reverse fault tectonic belts under the action of blasting stress waves. Blast disturbance through numerical simulation Model construction. Blasting holes were arranged in the lower rock strata 40 cm from the upper wall of the reverse fault, and the thickness of the coal seam was 20 cm. The detonation pressure acting on coal and rock at any given time can be expressed as follows:
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