Stress Deflection Effect and Rockburst Mechanism in Staggered Roadways Beneath “L-Shaped” Residual Pillar
Qiang Lu, Jiancheng Jin, Siyuan Gong, Hui Li, Rupei Zhang, Bingrui Chen, Ying Qu, Zonglong Mu
TL;DR
The paper explains how residual coal pillars create high-stress zones that cause rockbursts in staggered roadways and introduces methods to prevent them.
Contribution
A novel method for correcting rockburst hypocenter depth using moment tensor analysis and a prevention system for rockbursts in coal mines.
Findings
Compressive-shear failure of coal pillars is the dominant rupture mode in rockburst events.
The 'L-shaped' coal pillar structure's stress deflection effect increases rockburst risk.
A prevention system reduced rockburst frequency to zero in field tests.
Abstract
What are the main findings? We proposed a novel method for correcting the vertical height of rockburst hypocenters based on the moment tensor force mechanism.The predominant type of source rupture under the influence of residual coal pillars is compressive fracturing. We proposed a novel method for correcting the vertical height of rockburst hypocenters based on the moment tensor force mechanism. The predominant type of source rupture under the influence of residual coal pillars is compressive fracturing. What are the implications of the main findings? The “L-shaped” high-stress structure formed by residual coal pillars and its stress deflection effect are the primary causes of rockbursts. The “L-shaped” high-stress structure formed by residual coal pillars and its stress deflection effect are the primary causes of rockbursts. Frequent rockbursts in staggered roadways beneath…
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Taxonomy
TopicsRock Mechanics and Modeling · Coal Properties and Utilization · Geomechanics and Mining Engineering