采动裂隙场发育高度数值模拟研究

Numerical Simulation of Development Height of Mining Fracture Field

以顶板卸压带瓦斯抽采为主的瓦斯治理措施是有效防止回采工作面上隅角瓦斯超限的手段之一,采动裂隙是瓦斯运移的主要通道,采动裂隙场的分布决定着瓦斯抽采钻孔的布置层位,因而其发育高度的精准确定是该手段有效利用的前提。通过UDEC数值模拟确定了大水头煤矿东104工作面采动裂隙场发育高度,并通过数值计算得出该工作面初采期覆岩裂隙发育模型。结果表明:东104工作面19.18 m以下区域为垮落带,裂隙带最大发育高度为55.94 m.初采期间,采动裂隙场发育高度与工作面推进长度之比为0.5594,初采期覆岩裂隙发育沿走向方向顶部呈尖顶或椭球状,而沿倾斜方向呈平顶状,端部都呈逐渐降低的形态。

Gas control measures based on gas extraction in roof pressure relief zone is one of the effective means to prevent gas exceeding limit in upper corner of working face,the distribution of mining fissures determines the location of gas drainage borehole,so the accurate determination of its development height is the premise of effective use of this method.The development height of mining fissure field in east 104 working face of Dashuitou Coal Mine is determined by UDEC numerical simulation,and the model of overlying rock fissure development in the initial mining period is obtained by numerical calculation.The results show that the area below 19.18 m in the east 104 working face is the caving zone,and the maximum development height of the fracture zone is 55.94 m.During the initial mining,the ratio of the development height of the mining fracture field to the advancing length of the working face is 55.94 m,in the initial mining period,the overlying rock fissures developed in the shape of sharp top or ellipsoid along strike direction and flat top along dip direction.