Squeezing failure behavior of roof‐coal masses in a gob‐side entry driven under unstable overlying strata,Energy Science & Engineering

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Squeezing failure behavior of roof‐coal masses in a gob‐side entry driven under unstable overlying strata
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-03-24 , DOI: 10.1002/ese3.678
Guangchao Zhang _{1,

2,

3,

4} , Lianjun Chen _{1,

2} , Zhijie Wen _{1,

2} , Miao Chen _{1,

2} , Guangzhe Tao _{1,

2} , You Li _{1,

2} , Hao Zuo _{1,

2}

Affiliation

This paper endeavors to reveal the squeezing failure mechanism of roof‐coal masses and its correlation with the movement of the roof strata. An integrated method incorporating field instruments and numerical modeling was conducted. The borehole camera detection revealed that the development degree and scope of cracks in the roof strata on the coal pillar side are significantly larger than that on the panel rib side, and the fracture line of the main roof occurred above the coal pillar. A rigorous modeling procedure verified the borehole camera detection results and also found that the vertical and horizontal displacement of the roof‐coal mass exhibited asynchronous development characteristics at various heights. Subsequently, a comprehensive control strategy was proposed to prevent the squeezing failure behavior of roof‐coal masses in DUOS gob‐side entry. This study provides a basis for understanding the squeezing failure behavior of roof‐coal masses, and the proposed control strategy can potentially be applied in other similar mining projects.

中文翻译：

不稳定上覆地层驱动采空区巷道顶板煤体的挤压破坏行为

本文力求揭示顶煤体的挤压破坏机理及其与顶板运动的关系。进行了结合现场仪器和数值模拟的综合方法。钻孔摄像机检测表明，煤柱侧顶板地层的裂缝扩展程度和裂缝范围明显大于板肋侧，并且主顶板的裂缝线出现在煤柱上方。严格的建模程序验证了井眼摄像机的检测结果，并且还发现顶煤体的垂直和水平位移在不同的高度上表现出异步发展特征。后来，为了防止DUOS采空区入口顶煤质量的挤压破坏行为，提出了一种综合控制策略。这项研究为理解屋顶煤块的挤压破坏行为提供了基础，并且所提出的控制策略可以潜在地应用于其他类似的采矿项目。

更新日期：2020-03-24

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