基于压水试验的底板泥岩阻水能力研究

现场原位压水试验是揭示岩层阻水能力的可靠方法。为探究下组煤底板泥岩阻水能力，采用现场压水试验的手段对兖州矿区破碎程度不同的两段泥岩进行测试。采用渗透系数和平均阻水强度作为评价指标，对岩体的阻水能力进行对比分析。研究结果表明：破碎泥岩的渗透性远高于厚层状完整泥岩的渗透性，阻水能力有限；岩体的渗透性在水压达临界值后发生突变，水压对岩体渗透性的改变，在破碎泥岩中表现出持续性，而在厚层状完整泥岩中表现出瞬时性；厚层状完整泥岩的平均阻水强度明显超过破碎泥岩的平均阻水强度，能够阻抗更高的水压。本研究成果对兖州矿区下组煤底板泥岩阻水能力的认识，有一定的指导作用，同时也为下组煤的安全开采提供了重要参考依据。

Study on the Water-resisting Ability of Mudstone under Seam Floor Based on Water Injection Experiment

The in-situ water injection experiment is a particularly useful technique to determine the water-resisting ability of rock mass.In order to probe the water-resisting ability of lower coal mudstone seam floor，the water injection experiment in field is made to test two mudstone segments with different fragmentation degrees of Yanzhou Mining Area.With the permeability and the mean of water-resisting strength as the evaluation index，the water-resisting ability of the rock mass is comparatively analyzed.Results showed that the fragmented mudstone was stronger than the thick-bedded intact mudstone in the permeability with limited water resisting，the permeability of the rock mutated when the press reached at critical value.The change of permeability made by water pressure was sustained in fragmented mudstone，but it was instantaneous in thick-bedded intact mudstone.The thick-bedded intact mudstone was stronger than the fragmented mudstone in the mean of water-resisting strength.The conclusions will have the guide role in the cognition of lower coal mudstone seam floor in Yanzhou Mining Area，and the results make an important reference for safety-mining of lower coal mining.