陕北某渣场第四系松散层渗透性试验研究

第四系松散层是陕北的重要水源，易受煤化工渣场渗漏污染。为研究陕北第四系松散层抗污染特性，通过室内及现场试验，研究渣场第四系松散层包气带、含水层及隔水层的渗透性。结果表明:研究区第四系包气带厚度11~14 m，垂直渗透系数5.9~6.8 m/d；第四系含水层厚度28~41 m，渗透系数1.176～2.537 m/d，中等富水性，易受污染；隔水层为离石组粉土、粉质黏土，渗透系数在0.000 2~0.011 2 m/d，不透水—微透水性，隔水性能良好，隔断第四系含水层与基岩孔隙裂隙承压含水层间的水力联系，起到一定隔离污染物的作用。

Experimental study on permeability of quaternary loose layer in a dump in Northern Shaanxi Province

Quaternary loose layer was an important source of water in northern Shaanxi.And it was easily contaminated by the leakage of coal chemical residue.In order to study the antifouling characteristics of quaternary loose layer，the permeability of the aeration zone，aquifer and water-resisting layer in quaternary unconsolidated layer in the slag yard was studied through laboratory and field tests.The results showed that the thickness of quaternary gas zone was 11~14 m，the vertical permeability coefficient was 5.9~6.8 m/d.The thickness of quaternary aquifer was 28~41 m，the permeability coefficient was 1.176~2.537 m/d.It was moderately water-rich and vulnerable to pollution.The water-resisting layer was silt and silty clay in the levitation group，and the permeability coefficient was 0.000 2~0.011 2 m/d.It was impermeable to water of micro-water permeability.It was a good water barrier property.It could cut off the hydraulic connection between quaternary aquifer and bedrock pore fissure confined aquifer，and played a role of isolating pollutants.