中深部煤层开采条件下氡气探测应用初步探索
发布时间：2018-11-23 12:36
【摘要】：在地下煤炭资源开采过程中,采动岩体失稳破坏往往会造成严重的工程问题,因此掌握岩石破坏失稳机理及其临界信息特征已成为岩石力学领域的一个重要研究方向。以邯郸矿区亨健煤矿2507工作面采矿地质条件为基础,对中深部煤层开采条件下的氡气浓度变化与地表采动裂缝发育状况之间的相关性进行了初步探索。现场探测试验结果表明,根据氡气测量数据判断2507工作面初次来压步距为45 m左右,周期来压平均步距为15 m左右,与井下工作面矿压观测结果基本吻合,与工作面地表的变形裂缝形成一一对应关系,进一步证明了氡气探测在中深部煤层开采条件下应用的可行性。在此基础上,提出了氡气异常系数(k)的概念,确定了预测2507工作面覆岩层中基本顶发生破断的临界氡气异常系数值k≥15%。最后,从综合探测方法、氡气析出影响因素、裂隙岩体中氡气运移机理及氡气探测误差平差等方面指出了后续研究的方向。
[Abstract]:In the process of mining underground coal resources, unstable rock mass often causes serious engineering problems. Therefore, mastering the mechanism of rock failure and its critical information characteristics has become an important research direction in the field of rock mechanics. Based on the mining geological conditions of No. 2507 working face in Handan mining area, the correlation between radon concentration variation and the development of surface mining cracks under the condition of mining in middle and deep coal seam is preliminarily explored. The field test results show that the first step distance of 2507 face is about 45 m and the average interval of periodic pressure is about 15 m based on radon measurement data, which is basically consistent with mine pressure observation results of underground working face. It is proved that radon detection is feasible under the condition of mining in the middle and deep coal seam, which has a one-to-one correspondence with the deformation and fracture on the surface of the coal face. On this basis, the concept of radon anomaly coefficient (k) is put forward, and the critical radon anomaly coefficient k 鈮，
本文编号：2351640
[Abstract]:In the process of mining underground coal resources, unstable rock mass often causes serious engineering problems. Therefore, mastering the mechanism of rock failure and its critical information characteristics has become an important research direction in the field of rock mechanics. Based on the mining geological conditions of No. 2507 working face in Handan mining area, the correlation between radon concentration variation and the development of surface mining cracks under the condition of mining in middle and deep coal seam is preliminarily explored. The field test results show that the first step distance of 2507 face is about 45 m and the average interval of periodic pressure is about 15 m based on radon measurement data, which is basically consistent with mine pressure observation results of underground working face. It is proved that radon detection is feasible under the condition of mining in the middle and deep coal seam, which has a one-to-one correspondence with the deformation and fracture on the surface of the coal face. On this basis, the concept of radon anomaly coefficient (k) is put forward, and the critical radon anomaly coefficient k 鈮，
本文编号：2351640
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