应力作用下煤层底板关键隔水层渗透性分析  

Analysis on permeability of key water isolated stratum under seam floor and under stress function

作　　者：尹会永[1] 魏久传[1] 郭建斌[1] 朱鲁[1] 翟培合[1] 施龙青[1] 徐建国[2] 

机构地区：[1]山东科技大学地质科学与工程学院,山东青岛266510 [2]兖州煤业股份有限公司南屯煤矿,山东济宁273515

出　　处：《煤炭工程》2009年第10期74-76,共3页Coal Engineering

基　　金：山东科技大学"春蕾计划"资助(2008AZZ010);山东省自然科学基金资助(Y2007F46);国家自然科学基金资助(40772145)

摘　　要：为了对煤层底板关键隔水层的渗透性进行分析,利用瞬态渗透法进行了全应力-应变-渗透性试验。分析了各关键隔水层在应力作用下的应变-渗透性曲线,研究了不同岩石的渗透变化规律。结果表明,渗透性由大到小依次为:粉砂岩、铝土岩、泥岩、灰岩。影响岩石渗透性的因素除岩性外,还有围压大小及其变化速率、原生裂隙及后期裂隙扩展方式、贯通方式等。In order to analyze the permeability of the key water isolated stratum under seam floor, the transient permeability method was applied to the full stress - strain - permeability test. The strain - permeability curves of each key water isolated layer under the function of the stress were analyzed and the permeability variation law of different rocks was studied. The results showed that the permeabilities of the rocks from high to low were as followings, the fine sandstone, bauxite stone, mudstone and limestone. In additional to the lithology affected to the rock permeability, there were the scale of the surrounding rock pressure and the variation rate, original fractures and the later fracture extension mode and connection mode affected to the rock permeability.

关 键 词：底板突水 关键隔水层 全应力-应变过程 渗透系数 

分 类 号：TU458[建筑科学—岩土工程]