薄煤层保护层开采覆岩裂隙演变数值模拟  

Fracture Evolution Numerical Simulation of Overlying Rock in Very-thin-protective-layer Mining

作　　者：张标[1] 翁奇 蔡晓唱 赵玺 付明明[5] 

机构地区：[1]河北工程大学资源学院,河北邯郸056038 [2]陕西陕煤彬长矿业有限公司大佛寺煤矿,陕西咸阳713500 [3]中国石油大学地球科学与技术学院,山东青岛266555 [4]潞安集团高河能源有限公司,山西长治047100 [5]山东能源肥城矿业集团有限责任公司陈蛮庄矿,山东肥城274300

出　　处：《中州煤炭》2013年第1期12-15,22,共5页Zhongzhou Coal

摘　　要：在保护层开采时，上覆煤岩体的平衡遭到破坏，产生的破断和裂隙为瓦斯的运移创造了通道，有利于瓦斯的抽采。基于离散单元数值模拟软件UDEC”，模拟了保护层在不同开采参数时上覆煤岩体应力场和裂隙场的变化。研究结果表明：保护层开采时，被保护层煤岩体发生破断，最大主应力主要集中在开切眼和工作面附近，垂直应力大致呈“M”形分布；在开采保护层过程中，上覆煤岩体裂隙发育经历“产生-发展-闭合稳定”的动态发展规律，工作面附近发育裂隙最充分，大致呈一“梯形”，并随工作面推进动态前移；裂隙的发育程度和覆岩物理力学特性及开采参数有直接关系，在进行薄煤层保护层开采时应综合确定开采参数。In the protective layer mining, the balance of the overlying coal rock destruction causes the breaking and cracks, which creates gas migration channels good for gas drainage. Based on discrete element numerical simulating software UDEC2D ,the changing of the rock stress field and the fracture field was simulated in the overlying coal field in the protective layer with the different mining parameters. The findings show that, in the protective layer mining,the protected layer of coal and rock breaks, the maximum principal stress is main- ly concentrated in the vicinity of open-off cut and coal working face,and the vertical stress is distributed almost in M-shape. In the pro- tective layer mining,the overlying coal and rock fracture experiences ＂ generation-development-closed stability＂ dynamic process of de- velopment. The fracture develops sufficiently near the working face,in the shape of a ＂ trapezoid＂ ,which moves forward dynamically as the working face advances. The degree of development of fracture is directly related to the physical properties and mining parameters of overlying strata. Therefore, the mining parameters should be comprehensively determined during the thin-protective-layer mining.

关 键 词：保护层开采 数值模拟 应力场 裂隙场 

分 类 号：TD713.31[矿业工程—矿井通风与安全]