煤岩流变模型与地表二次沉陷研究
COAL CREEP AND GROUND SUBSIDENCE OF FENGFENG COAL MINEⅡ
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摘要: 通过流变实验研究发现,煤岩流变具有低流变系数和高蠕变门槛值特征,并符合对数型经验公式和修正的伯格斯理论模型。作者以河北峰峰矿区为例,求出了各级应力水平下煤岩流变经验公式的典型参数集,并结合峰峰二矿工业广场建筑物下条带开采地表沉陷实例进行了分析。Abstract: Creep experiments of coal under uniaxial load show a low creep factor (Z=e1/ec) and a high threshold stress (eth).The samples are taken from the Fengfeng coal field in Hebei Province.Creep parameter sets determined at different stress levels were presented.Calculations of ground subsidence due to underground mining of Fengfeng coal mine Ⅱ using the present experiment results call for farther precautions.
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Key words:
- coal /
- creep /
- theoretical model /
- experimental formula /
- mining subsidence
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