弱胶结地层条件下垮落带岩层破碎冒落特征与压实变形规律试验研究

发布时间：2018-08-13 18:42

【摘要】：采空区顶板岩层的破碎、冒落、压实、类固结等性能是影响垮落带高度变化的重要因素。通过破碎岩石压缩实验和岩石崩解实验,研究了不同类型岩石的破碎、崩解性能,分析了岩石膨胀变形—破碎冒落—充填压实—蠕变固结的变形过程及特征,揭示了我国东部和西部矿区岩石变形破坏的差异性。研究结果表明:弱胶结岩石具有强碎胀、易崩解的特性,西部弱胶结岩石较中东部岩石更易破碎,耐崩解指数较中东部岩石偏小,岩石耐崩解指数随崩解循环次数增加呈线性递减关系;相同采高条件下,西部弱胶结地层工作面初始垮落带高度较中东部岩层工作面小,弱胶结地层工作面垮落带趋于稳定后垮落带高度的变化量大,弱胶结岩石的胶结性越差这种特性越强。相似模拟试验结果证明了理论分析的可靠性。
[Abstract]:The properties of roof strata in goaf such as breakage, caving, compaction and similar consolidation are the important factors that affect the height of caving zone. In this paper, the crushing and disintegrating properties of different types of rocks are studied by means of crushing rock compression test and rock disintegration experiment, and the deformation process and characteristics of rock swelling deformation-crushing caving, filling compaction and creep consolidation are analyzed. The difference of rock deformation and failure in eastern and western mining areas of China is revealed. The results show that the weak cemented rocks have the characteristics of strong dilatation and easy disintegration. The weak cemented rocks in the west are more easily broken than those in the middle and eastern parts, and the disintegration resistance index is smaller than that in the middle and eastern regions. Under the same mining height, the initial collapse height of the western weak cemented strata is smaller than that of the middle and eastern face. The height of caving zone in weak cemented strata tends to be stable, and the worse the cementation of weakly cemented rock is, the stronger this property is. The simulation results show the reliability of the theoretical analysis.
【作者单位】：河北工程大学矿业与测绘工程学院;河北省煤炭资源综合开发与利用协同创新中心;北京科技大学土木与资源工程学院;江西理工大学资源与环境工程学院;
【基金】：国家重点研发计划资助项目(2016YFC0600801) 国家自然科学基金重点资助项目(51534002);国家自然科学基金资助项目(51174015)
【分类号】：TD325

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