Seepage Law of Injected Water in the Coal Seam to Prevent Rock Burst Based on Coal and Rock System Energy

Abstract

Rock burst is one of the typical dynamic disasters in coal mining. In order to reveal the mechanism of rock burst from the energy view point, the relationships between the maximum, minimum, and intermediate principal stresses and the concentration coefficients of the gravity stress k1, k2, and k3 are determined through the geostress measurement combined with engineering practice of coal mining. The coal and rock system model based on the tectonic stress is established. The relationship between energy and scale radius of the coal and rock system is determined to reveal the law of energy accumulation, release, and transfer in the coal and rock system. In view of the characteristics of the porous medium in the coal seam, the measures of water injection are put forward to relieve pressure in the coal seam, and the law of water seepage in the process of water injection in the coal seam is studied based on the seepage mechanics. The result shows that the trend of released energy of damaged coal has good consistency with the variation of permeability, and water injection can reduce the stress concentration and energy concentration of the rock burst system. The engineering practice of the rock burst prevention was taken in Yuejin Coal Mine. The energy characteristics of the coal and rock system in the working face are analyzed, and the measures of water injection and the corresponding parameters are determined.

Experiments on Mechanical Response and Energy Dissipation Behavior of Rockburst‐Prone Coal Samples Under Impact Loading

“…Coal and rock mass buried in deep is subjected to a complex geological environment with the depletion of shallow resources and the increase of coal mining depth [1,2]. Coal mass with great stored elastic energy may be subjected to strong impact loading when it is disturbed by mining operations, such as uncovering coal seam from rock mass, engineering blasting, roadway excavation, nearby coal seam mining, resulting in serious mine dynamic disasters such as rockburst, coal and gas outburst accompanyed with a large amount of released energy [3][4][5][6][7][8][9]. ese disasters may lead to great property losses and casualties.…”

Controlling Mechanism of Rock Burst by CO2 Fracturing Blasting Based on Rock Burst System

“…e occurrence mechanisms of the two are similar and they are difficult to be predicted [1][2][3][4]. e research on the mechanism of rock burst has always been an unsolved scientific problem that has been discussed for a long time in the fields of mining engineering and rock mechanics [5][6][7][8][9][10]. e application of CT scanning, 3D printing, big data, cloud computing, Internet of things, and other emerging technologies in the study of coal mine rock burst has become a hot topic in mining research [11][12][13][14].…”

Failure Behavior and Energy Storage and Release of Hard Coal under Different Static and Dynamic Loading States

“…Zhang et al considered the effects of depth on the in situ stress environment and physical properties of coal and conducted triaxial compression experiments on 128 coal samples that were on this basis, showing that, with increasing depth, the elastic energy and dissipated energy increase more rapidly [12]. Lan et al established the coal and rock system model based on the tectonic stress and showed that the trend of released energy of damaged coal has good consistency with the variation of permeability, and water injection can reduce the stress concentration and energy concentration of the rock burst system [13]. Feng et al studied the relationship between stress-strain, uniaxial compressive strength, displacement rate, loading rate, fractal dimension, and energy dissipation rate through static loads and dynamic loads experiment [14].…”