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奥陶系峰峰组顶部碳酸盐岩隔水性能研究

Study on the relative water-resisting performance of carbonate rocks at the top of the Ordovician Fengfeng Formation

  • 摘要: 为实现深部煤炭资源的带压安全开采,基于晋南部分矿区奥陶系灰岩顶部具有显著阻水特性的地质特征,采取增加煤层底板隔水层厚度的技术方案成为奥陶系灰岩水害防治的重要突破口。以王家岭煤矿奥陶系灰岩顶部作为研究对象,采用力学性能测试、扫描电镜、压汞试验、渗透性测试等方法,研究其隔水性能。研究结果表明:王家岭煤矿峰峰组地层顶部0~20 m内,岩石单轴抗压强度为37.32~63.34 MPa,岩石渗透率为1.21×10-5~9.92×10-4 μm2,岩石渗透系数为1.16×10-8~5.99×10-7 cm/s,岩石单轴抗压强度高,孔隙之间连通性差,孔隙发育程度较低,渗透性能较差,渗透等级属于极微透水类型,该岩层可作为相对隔水层加以利用。

     

    Abstract: In order to achieve the safe mining of deep coal resources under high pressure, considering that the top of Ordovician limestone in southern Shanxi some mining areas has the significant certain water resistance,the technical idea of increasing the thickness of the coal seam floor aquitard has became an important solution in the prevention and control of Ordovician limestone water. Taking the top of Ordovician limestone in Wangjialing Coal Mine as the research project,the water resistance performance was studied through mechanical property testing,scanning electron microscopy,mercury intrusion testing, permeability testing,and other methods. Research has shown that within the top thickness of 0 m to 20m range of the Fengfeng Formation in Wangjialing Coal Mine,the rock uniaxial compressive strength was within 37. 32 MPa to 63. 34 MPa,the rock permeability was ranged from 1. 21×10-5 μm2 to 9. 92×10-4 μm2,and the rock permeability coefficient was within 1. 16×10-8 to 5. 99×10-7 cm/s. The results show that, for the ordovician top, the rock uniaxial compressive strength is high, the connectivity between pores is poor the degree of pore development is low the permeability performance is poor, and the permeability grade belongs to the extremely micro permeable type. The Ordovician top can be considered as a relatively impermeable layer.

     

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