摘要
通过构建机械造穴瓦斯运移应力场、渗流场及裂隙场多场耦合数学模型和几何模型,结合鹤煤九矿煤层参数,利用COMSOL多物理场数值模拟软件,针对不同造穴直径、抽采时间和造穴长度等参数下的瓦斯抽采运移规律开展了数值模拟,结果表明:首先,机械造穴可增大围岩的塑性区半径、煤层渗透率与孔隙率,扩大瓦斯抽采半径和影响范围,提高了煤层卸压增透效果,使抽采达标时间大幅缩短;其次,实施机械造穴工艺时,增加造穴长度对于增加瓦斯抽采有效影响范围优于增加造穴半径。该研究为煤矿井下现场实施机械造穴技术提供了科学依据。
A multi-field coupled mathematical and geometric model of mechanical cavitation gas transport stress field,seepage field and fracture field was constructed,and numerical simulations were carried out using COMSOL multi-physical field numerical simulation software for the gas extraction and transport law under different parameters of cavitation diameter,extraction time and cavitation length.The results show that:firstly,mechanical cavitation can increase the radius of plastic zone of surrounding rock,coal seam permeability and porosity,expand the radius and influence range of gas extraction,strengthen the effect of coal seam pressure relief and permeability,and shorten the extraction time;secondly,when implementing mechanical cavitation process,increasing the cavitation length is better than increasing the cavitation radius to increase the effective influence range of gas extraction.The study provides scientific basis for the implementation of mechanical cavitation technology in underground coal mines.
作者
熊俊杰
杨程涛
武腾飞
XIONG Junjie;YANG Chengtao;WU Tengfei(Henan Energy Group Research Institute Co.,Ltd.,Zhengzhou 450046,China;Henan Engineering Research Center of Simultaneous Extraction of Coal and Gas with Low Permeability and Outburst Coal Seam,Zhengzhou 450046,China)
出处
《煤炭技术》
CAS
2024年第4期213-219,共7页
Coal Technology
关键词
瓦斯运移
数学模型
机械造穴
数值模拟
抽采半径
gas transport
mathematical model
mechanical cavity creation
numerical simulation
extraction radius
