Disaster-inducing mechanism in a roadway roof near the driving face and its safety-control criteria
Disaster-inducing mechanism in a roadway roof near the driving face and its safety-control criteria
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DOI：
10.1016/j.ssci.2019.02.006
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发表时间：
2019-06
期刊：
影响因子：
6.1
通讯作者：
Suchuan Tian;Xing-liang Xu;Zhen-lei Li
中科院分区：
文献类型：
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作者：
Suchuan Tian;Xing-liang Xu;Zhen-lei Li
煤矿巷道掘进工作面附近发生的落顶事故，严重威胁着施工人员的安全。以山东省济宁市兖州煤矿集团公司济宁三矿为研究对象，对某煤巷掘进工作面附近的顶板结构进行了分析。同时，通过力学分析和数值模拟研究了其致灾机理。结果表明，人工支护结构和c形支撑结构共同决定了顶板的安全。随着无支撑顶板长度的增加，两种结构在顶板上的控制效果经历了叠加支撑阶段、协同支撑阶段和独立支撑阶段三个阶段的行为。在这种情况下，顶角的煤变得更松散，屋顶跨度增加。结果，无支撑的屋顶的安全性恶化，后部是第一个受损的部分，从而引发了屋顶坠落事故。在此基础上，提出了无支护顶板的安全控制准则，为评价支护强度、保障隧道施工安全提供了重要依据。
Roof-fall accidents, happening near the driving faces of coal roadways, threaten the safety of construction operatives. Taking Jining No. 3 Coal Mine of Yanzhou Coal Mining Group Corp. (Jining City, Shandong Province, China) as the research object, we analysed the roof structure near the driving face of a coal roadway. Meanwhile, the disaster-inducing mechanism was studied through mechanical analysis and numerical simulation. The results demonstrated that the artificial support structure and C-shaped bracing structure co-determine the safety of the roof. With the length of unsupported roof (LUR) increasing, the control effects of the two structures experienced three stages of behaviour (i.e. a superimposed support stage, collaborative support stage, and independent support stage) on the roof. In these, coal at the top corners became looser and the roof span increased. As a result, the safety of the unsupported roof deteriorated, with the rear part being the first to become damaged, thus triggering a roof-fall accident. Based on the above conclusion, the research proposed safety-control criteria for an unsupported roof, and thus provides a critical basis for assessing support strength and ensuring the safety of tunneling construction operations.