摘要
为了探究永煤公司新桥煤矿深埋煤层大采宽工作面导水裂隙带高度发育特征,以典型的开采宽度330 m的某工作面为研究对象,建立了深埋煤层大采宽工作面三维工程地质概化预开采模型,采用FLAC3D数值模拟软件对采动覆岩导水裂隙带高度进行研究,发现这种大采宽工作面开采后应力集中程度明显增大。和经验公式类比获得了该工作面导水裂隙带高度取值范围,提出了现行规范中的相关计算公式预计结果明显偏小,已不适合这种地质及开采条件。最后,在其他条件不变仅改变采宽条件下,模拟了7种不同采宽开采后沿倾向和走向导水裂隙带高度发育特征,对比分析发现导水裂隙带高度随采宽增加呈非线性变化,两者之间具有很好的自然对数拟合关系,确定了增加幅度的采宽阈值及其变化特征。
In order to study growth characteristics of water-conducting fractured zone height in Xinqiao coal mine Yangmei company,deep coal seam large mining width working face,using a mining width 330 m of a typical working face as the research object,three-dimensional engineering geological mining generalized prediction model is established for the deep coal seam large mining width face.Base on the FLAC3D numerical simulation software,water-conducting fractured zone height is simulated.It is found that the stress concentration degree increases obviously after mining in the large mining width working face.By analogy with the empirical formula,the value range of the water-conducting fractured zone height is obtained in the working face,and the prediction result of the relevant calculation formula in the current code is obviously too small,which is no longer suitable for the geological and mining conditions.Finally,under the other conditions the same,only change the width,simulates the 7 different mining width water-conducting fractured zone height growth characteristics along the strike and dip,water-conducting fractured zone height change with the increase of mining width is nonlinear,has the very good natural logarithm fitting relationship,the increase in mining width threshold is determined.
作者
丁亚恒
张胜军
朱术云
王诗灵
DING Yaheng;ZHANG Shengjun;ZHU Shuyun;WANG Shiling(Xinqiao Coal Mine,Yongmei Company,Henan Energy and Chemical Industry Group Co.,Ltd.,Yongcheng 476600,China;Yongmei Company,Henan Energy and Chemical Industry Group Co.,Ltd.,Yongcheng 476600,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;Yongcheng Coal Power Holding Group Co.,Ltd.,Yongcheng 476600,China)
出处
《煤炭技术》
CAS
2024年第1期166-171,共6页
Coal Technology
关键词
大采宽
导水裂隙带
数值模拟
类比分析
厚煤层
large mining width
water-conducting fractured zone
numerical simulation
analogy analysis
thick coal seam
