Laboratory and field validation of a LTCC recovery prediction model using relative size of the top coal blocks
Laboratory and field validation of a LTCC recovery prediction model using relative size of the top coal blocks
复制标题
使用顶煤块相对尺寸对 LTCC 采收率预测模型进行实验室和现场验证
DOI：
10.1007/s10064-020-01970-0
复制
发表时间：
2020-09-16
影响因子：
4.2
通讯作者：
Mishra, Brijes
中科院分区：
文献类型：
--
作者：
Wang, Jiachen;Wei, Weijie;Mishra, Brijes
顶煤块体采出率是综放开采放煤效果的直接反映，快速准确地预测现场采出率是目前面临的主要难题之一。分析了顶煤相对粒度与采出率的关系，提出了实验室条件下的顶煤采出率预测模型。确定了顶煤块度测量方法，研制了顶煤回收率现场测量装置。此外，我们测量了顶煤的相对尺寸和现场恢复在中国四个代表性的LTCC面板。结果表明，在实验室RPM条件下，随着顶煤相对粒度的增大，顶煤回收率先增大后减小。采用盘区一次开孔顺序放顶煤开采，顶煤相对粒度在0.14左右时，回采率最大。在现场，随着顶煤厚度的增加，顶煤粒度分布曲线逐渐由凸向凹，顶煤相对粒度从0.005逐渐增大到0.202。当顶煤相对粒度较大时，顶煤回收率也先增大后减小。然而，现场测量的恢复值相对较小。当顶煤相对粒度大于等于0.079时，修正后的现场RPM能够准确预测现场采出程度，验证了现场预测模型的准确性。RPM提供了一种新的恢复估计方法，可以大大减少恢复测量的成本和工作量，提高恢复测量的效率。
The recovery ratio of top coal blocks is the direct reflection of drawing effect in longwall top coal caving (LTCC), and predicting the field recovery rapidly and accurately is one of the leading difficult problems. We analyzed the relationship between the recovery and the relative size of top coal, and proposed a recovery prediction model (RPM) in the laboratory. We determined the measurement method of the top coal blocks size, and developed the field setup for measuring the recovery. In addition, we measured the relative size of top coal and the field recovery at four representative LTCC panels in China. The results show that in the laboratory RPM, with increasing relative size of top coal, the recovery increased first and then decreased. Employing the single-opening sequence caving in the panel, the recovery is the maximum when the value of the relative size of top coal is about 0.14. In the field, as thickness of top coal increased, the size distribution curves of top coal gradually changed from convex to concave, and the relative size of top coal gradually increased from 0.005 to 0.202. When the relative size of top coal is large, the recovery also increased and then decreased. However, the value of the field measured recovery is relatively small. When the relative size of top coal is equal to or greater than 0.079, the corrected field RPM can accurately predict the field recovery, verifying the accuracy of the field prediction model. RPM provides a new approach to estimate the recovery, which can greatly reduce the measurement cost and workload, as well as improve the measurement efficiency of recovery.