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首页> 外文期刊>Engineering failure analysis >The mechanism of bedding separation in roof strata overlying a roadway within a thick coal seam: A case study from the Pingshuo Coalfield, China
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The mechanism of bedding separation in roof strata overlying a roadway within a thick coal seam: A case study from the Pingshuo Coalfield, China

机译：厚煤层上覆巷道顶板地层分离机理-以平朔煤田为例

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Bedding separation in roof strata (BSRS) overlying roadways within thick coal seams (RTCS) is an important factor leading to surrounding instability in underground coal mines, and especially to roof failures such as convergence, and even caving-in. To prevent reason, and to protect the working miners, it is essential to understand the mechanism of underpinning BSRS overlying RTCS. In this research, combined with the theoretical analysis and test results of continuous, and discontinuous, beams and stratified rock strata load, a new approach to predict the locations at which BSRS occurred was proposed; additionally, the calculation equation for BSRS was deduced. Based on standard monitoring methods widely used in exploring roof behaviour in underground coal roadways, a typical roadway excavated within 12.87 m, in an average thickness coal seam, in Jinggonger coal mine, Pingshuo Coalfield, Shanxi Province, China, that was chosen to explore the mechanism underpinning BSRS, and a set of monitoring designs, mainly including five groups of stations and 16 instruments, is determined and applied to this research. Results showed that the predicted locations of BSRS overlying RTCS were in accordance with field monitoring results. This proved the validity of the theoretical model. Besides, the working face played an important role in BSRS and 75% of the BSRS events were generated within the 50 m between the monitoring station and the working face. When the distance was decreased to 5 m, the BSRS was up to 90.9 mm and 86 mm at depths of 6.8 m and 3.8 m, respectively. Meanwhile, three stages were considered, step-by-step, as opposed to mining activity dependent upon the extent of its influence on BSRS: a pink value (indicative of an alarm status) prevailed during the third stage. (C) 2015 Elsevier Ltd. All rights reserved.
机译：厚煤层（RTCS）上覆于巷道的顶板地层（BSRS）的层理分离是导致地下煤矿周围不稳定的一个重要因素，尤其是导致顶板故障，例如会聚甚至塌陷。为了防止原因并保护工作中的矿工，必须了解支撑RTCS之上的BSRS的机制。在这项研究中，结合连续，不连续梁和分层岩层荷载的理论分析和试验结果，提出了一种预测BSRS发生位置的新方法。另外，推导了BSRS的计算公式。根据广泛用于探索地下煤巷顶板行为的标准监测方法，选择了在中国山西省平朔煤田井贡格煤矿中平均厚度煤层开挖的平均厚度为12.87 m内的典型巷道。确定了支持BSRS的机制，并确定了一套监测设计，主要包括五组站和16台仪器，并应用于本研究。结果表明，BSRS覆盖RTCS的预测位置与现场监测结果一致。这证明了理论模型的有效性。此外，工作面在BSRS中起着重要作用，在监测站与工作面之间的50 m内产生了75％的BSRS事件。当距离减小到5 m时，BSRS在6.8 m和3.8 m的深度处分别达到90.9 mm和86 mm。同时，考虑了分三个阶段，而不是根据其对BSRS的影响程度来进行采矿活动：在第三阶段盛行粉红值（表示警报状态）。 （C）2015 Elsevier Ltd.保留所有权利。

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