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Abstract
Borehole pressure relief method is one of the most effective ways of rock burst prevention in coal mines. The measured results of borehole pressure relief at no. 8939 longwall face in Xinzhouyao coal mine, China, are presented here. The analyses identify the pressure relief magnitudes in coal mass around the boreholes with different diameters, spacing, and drilling time. This research has established that the best pressure relief of the rib coal can be achieved by using φ108 mm borehole with 0.7 m interval after 288 hours. The strain relief is acceptable after 288–360 hours of drilling, while the best result is achieved after 432 hours. It is also the first time to monitor the borehole pressure relief in a coal mine on‐site using Brillouin optical time domain reflectometer (BOTDR) distributed fibre‐optic sensing. The method implemented in this research provides new ways to improve stress relief design and minimize the rock burst occurrence for mine practitioners.
Highlights
Rock burst is a complex dynamic phenomenon of rock failure in highly stressed ground
Stressed area accumulates more potential energy resulting in high burst proneness. us, the boreholes drilled within highly stressed coal can fracture and soften the surrounding coal mass effectively [1, 2]. eoretical analysis, numerical calculation, and electromagnetic radiometer can be used to determine the yielded zone
A specially designed Brillouin optical time domain reflectometer (BOTDR) sensing fibre was developed and buried into the coal seam to measure the internal strain distribution after the pressure relief boreholes were constructed. e monitoring results have been analyzed in detail, including the relationship between the pressure relief and the duration, location, and size of the borehole
Summary
Rock burst is a complex dynamic phenomenon of rock failure in highly stressed ground. The commonly used methods to predict strata failure include [3,4,5,6,7,8,9,10,11] empirical formulas, physical modelling, numerical simulations, field observations, microseismic system, etc. A specially designed BOTDR sensing fibre was developed and buried into the coal seam to measure the internal strain distribution after the pressure relief boreholes were constructed. A specially designed BOTDR sensing fibre was developed and buried into the coal seam to measure the internal strain distribution after the pressure relief boreholes were constructed. e monitoring results have been analyzed in detail, including the relationship between the pressure relief and the duration, location, and size of the borehole
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