A Mechanical Analysis of Support Instability Risk along the Strike of Coalface in Thick Coal Seam with Large Dip Angle: A Case Study

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Earth Sciences Research Journal Pub Date : 2021-04-16 DOI:10.15446/ESRJ.V25N1.74167

Wei Zhang, Weisheng Zhang, Dongsheng Zhang, Dahong Qi, Z. He

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引用次数: 1

Abstract

How to cite item Zhang, W., Wang, T., Zhang, D., Zhang, Y., Xu, P., & Duan, X. (2021). A mechanical analysis of support instability risk along the strike of coalface in thick coal seam with large dip angle: a case study. Earth Sciences Research Journal, 25(1), 101-108. DOI: https://doi.org/10.15446/ esrj.v25n1.74167 Studying the support stability of a coalface with a large dip angle (LDA) and large mining height (LMH) under the corresponding conditions is essential to ensure safe and high-efficiency mining. This study is based on the #3up509 coalface of the Gaozhuang Coal Mine (GCM) affiliated with the Zaozhuang Mining Area. The authors analyzed the mechanical characteristics of support in the coalface with LDA and LMH. On this basis, the mechanical models for support tilting and sliding in the coalface were developed. Then, support stability along the coalface’s strike during the normal mining period (NMP) and special mining period (SMP) was analyzed. The results show that the critical support tilting resistance during the NMP is 52.2 kN, and the critical support sliding resistance is 183.75 kN. And for the SMP, the values are 229.7 kN and 4425 kN. The use of two-leg shield support, known as ZY6600-25.5/55 (its rated working resistance is 6600 kN), is investigated, which is proved reasonable for the coalface. Finally, some technical measures, such as installing an interlock set to fasten support and adjustable lifting jack, increasing the setting load of the support, and optimizing the support displacement method, are taken to improve the coalface’s overall support stability. The initial aim for safe and high-efficiency mining of the #3up509 coalface has been achieved through these measures. ABSTRACT A mechanical analysis of support instability risk along the strike of coalface in thick coal seam with large dip angle: a case study

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大倾角厚煤层工作面走向支护失稳风险的力学分析——以某煤层为例

如何引用项目张，W，王，T，张，D，张，Y，徐，P，段，X（2021）。大倾角厚煤层工作面走向支架失稳风险的力学分析：一个实例研究。《地球科学研究杂志》，25（1），101-108。DOI：https://doi.org/10.15446/esrj.v25n1.74167研究大倾角（LDA）和大采高（LMH）工作面在相应条件下的支护稳定性，对于确保安全高效开采至关重要。本研究以枣庄矿区高庄煤矿3up509工作面为研究对象。采用LDA法和LMH法分析了工作面支架的力学特性。在此基础上，建立了工作面支架倾斜和滑动的力学模型。然后，分析了正常开采期（NMP）和特殊开采期（SMP）沿工作面走向的支护稳定性。结果表明，NMP过程中支架的临界倾斜阻力为52.2 kN，支架的临界滑动阻力为183.75 kN。SMP的临界倾斜和滑动阻力分别为229.7 kN和4425 kN。研究了ZY6600-25.5/55（额定工作阻力为6600 kN）两支腿盾构支架的使用，证明其适用于采煤工作面。最后，通过安装固定支架的联锁装置和可调千斤顶、增加支架的设置荷载、优化支架位移方法等技术措施，提高了工作面支架的整体稳定性。通过这些措施，实现了3up509工作面安全高效开采的初步目标。大倾角厚煤层工作面走向支架失稳风险的力学分析

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来源期刊

Earth Sciences Research Journal 地学-地球科学综合

CiteScore

1.50

自引率

0.00%

发文量

审稿时长

>12 weeks

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