高应力水射流作用下煤的破碎机理及性能

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
Dizhe Zhang, Shi-chen Cao, Z. Ge, Zhou Zhe, X. Liu
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引用次数: 0

摘要

地应力对水射流破煤特性的影响尚不清楚,制约了深部煤层气的开发。利用自行研制的原位应力模拟器进行了不同三维平均应力和水平应力差条件下的水射流破煤试验。当平均三维应力增大时,煤体由剪切、拉伸破坏转变为剪切破坏,侵蚀坑体积先快速减小后缓慢减小。当平均三维应力从0增加到10 MPa时,侵蚀坑体积减小了79.7%,比能耗增加了近5倍。随着水平应力差的增大,煤体由剪切破坏向剪切和拉伸破坏过渡,在远离侵蚀坑的地方形成剪切裂缝。水平应力差为15 MPa时,侵蚀坑体积和比能耗分别达到最大值和最小值。因此,构筑较高的水平应力差有利于提高水射流破煤效率。该研究为水射流技术在深部煤层的应用奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Breaking mechanism and performance of coal subjected to water jets under high in situ stress
The effect of in situ stress on the coal-breaking characteristics of water jets remains unclear, prohibiting the deep coalbed methane (CBM) development. Water jet coal-breaking experiments under different mean three-dimensional (3D) stresses and horizontal stress differences were carried out with a self-developed in situ stress simulator. When the mean 3D stress increased, coal changed from shear and tensile failure to shear failure, and the volume of the erosion pit first decreased rapidly and then slowly. Upon increasing the mean 3D stress from 0 to 10 MPa, the volume of the erosion pit decreased by 79.7%, and the specific energy consumption increased nearly five times. With an increase in horizontal stress difference, coal transitioned from shear failure to shear and tensile failure, resulting in a shear crack farther from the erosion pit. At a horizontal stress difference of 15 MPa, the volume of the erosion pit and specific energy consumption had maximum and minimum values, respectively. Consequently, constructing a higher horizontal stress difference helps improve the coal-breaking efficiency of water jets. This study could lay the foundation for applying water jet technology in deep coal seams.
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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