摘要
针对大规模粗放型开采所产生的煤柱和不规则块段等滞留煤炭资源的回收问题,提出采用短壁块段式采煤技术对其进行回收,并对块段式采煤上覆岩层导水裂隙带高度发育规律进行了研究。基于块段式工作面的特殊性,确定影响块段式采煤过程中导水裂隙带高度发育的主控因素分别为采高、块段间保护煤柱、块段长度和埋深。采用UDEC模拟软件对块段式采煤过程中不同影响因素下的导水裂隙带发育规律进行分析。结果表明:导水高度随采高和埋深的增加呈线性增加,随块段长度的增加呈对数函数增加,而随块段间保护煤柱宽度的增加呈线性递减状态。依据各因素与导水裂隙带高度关系,通过MATLAB对导水高度进行非线性回归分析,建立了块段式采煤导水高度预测模型,得到预测导水高度为52.9 m;现场实测导水高度为47.98~50.06 m。
In order to effectively recover the residual coal resources including the coal pillars and irregular coal blocks caused by large-scale extensive mining, the short wall block mining(SBM) mining technique is put forward in this study. And the development pattern of fractured water-conducting zone in the overlying strata during the SBM is investigated. Based on the particularity of SBM working face, the main controlling factors affecting the fractured water-conducting zone are identified as follows: mining height, width of the protective coal pillar among the blocks, block length and mining depth. The development behavior of fractured water-conducting zone under various factors are analyzed by adopting the UDEC software. Results show that the height of fractured water-conducting zone(HFWZ) rises linearly with the increase in the mining height and mining depth. Meanwhile, the HFWZ increases logarithmically with the increasing block length. In contrast, it decreases linearly with the increase in the width of coal pillars.Finally, a predictive model of HFWZ in SBM is developed through a nonlinear regression analysis using the MATLAB. This model predicts a HWFC of 52.9 m in the experimental area, which is very close to the field-measurement results ranging from 47.98 m to 50.06 m.
引文
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