【摘 要】
：
通过对隔水层土样实验,获得了离石黄土和三趾马红土的应力应变全程曲线、渗透系数和膨胀率.基于考虑黏土应力应变全程相似和水理性相似的固液耦合相似模拟,揭示了浅埋煤层长
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通过对隔水层土样实验,获得了离石黄土和三趾马红土的应力应变全程曲线、渗透系数和膨胀率.基于考虑黏土应力应变全程相似和水理性相似的固液耦合相似模拟,揭示了浅埋煤层长壁开采覆岩采动裂隙带分布规律,发现了"上行裂隙"和"下行裂隙"是隔水层稳定性的主要因素,"下行裂隙"是潜水流失的主要通道之一.发现了隔水层土体膨胀性将产生的"裂隙弥合"现象,可减缓"下行裂隙"的发展.建立了"下行裂隙"模型,给出了"下行裂隙"弥合判据,为隔水层稳定性和保水开采研究提供了理论依据.
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