近距离煤层采动裂隙场BBM-DEM模拟研究
Study on mining-induced fracture field of contiguous coal seam with BBM-DEM simulation
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摘要: 为了深入理解采动裂隙的演化规律及保护层开采在近距离煤层中的卸压作用，以BBM-DEM模拟方法为研究手段，以沙曲煤矿2号煤保护层的开采过程中采动裂隙的演化特征为研究对象，进行了建模及初步的数值模拟分析。研究结果表明：保护层开采后BBM四面体块体接触面发生了以拉破坏为主的破坏模式，真实反映了工作面推进过程中上覆岩层的运动规律，并根据接触面的破坏机理，得到围岩裂隙的分布及发育程度；围岩位移场在竖直方向上呈现由下至上减少的趋势；BBM块体在保护层卸压作用下能更加有效地呈现出岩层断裂和动态失稳的过程，并且垂直应力在采空区压实区具有非均匀分布特征。该模拟方法具有精细化模拟的潜力，其模拟结果能加深对煤层开采造成的应力场和裂隙场的理解，对现场实践提供一定参考作用。Abstract: In order to-deeply understand the evolution law of mining-induced fracture field and the pressure-relief effect due to protective coal seam mining in contiguous coal seams,the BBM-DEM simulation method was used as the research method to exploit the fissures in the mining process of the No. 2 coal protective layer of Shaqu Coal Mine, and the modeling and preliminary numerical simulation analysis were carried out. The research results show that the contact surface of BBM tetrahedral block has a tensile failure mode after the mining of the protective layer, which truly reflects the movement law of the overlying strata during the process of advancing the working face. According to the failure mechanism of the contact surface, the distribution and development degree of the surrounding rock fracture are obtained;The displacement field of surrounding rock shows a trend of decreasing from bottom to top in vertical direction;The BBM block can more effectively show the process of rock fracture and dynamic instability under the pressure relief of protective layer and it is found that the vertical stress has a non-uniform distribution characteristic in the compaction area of the gob. The simulation method has the potential of refinement simulation, and its simulation results can deepen the understanding of the stress field and fracture field caused by coal seam mining, and provide a certain reference for field practice.
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期刊类型引用(1)
1. 王麦可, 金庆雨. 基于改进YOLOv7的煤矿炮孔智能检测方法. 矿冶. 2025(03) 
百度学术
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