为了探讨济北矿区下组煤底板灰岩水岩作用及其微观机理，对山东岱庄煤矿深部底板灰岩进行了电导率试验研究，并通过荧光分析和电镜扫描对灰岩的微观机理进行相关探讨。研究结果表明：①通过对自来水和纯净水浸泡灰岩试样的电导率测试，发现灰岩的溶解可分为快-慢-稳定3个阶段；自来水浸泡的溶液电导率随时间增加而减小，纯净水则相反。②荧光试验发现，自来水浸泡前后，灰岩各化学组成的质量分数并没有明显变化，灰岩中矿物主要以方解石( CaCO3)为主，占90%以上；含有少量石英( SiO2)，而Na、K、Mg、Al等元素总的质量分数不到3%。③通过扫描电镜发现，自来水浸泡前的岩样微观结构较为致密，多呈团块状，断面较为光滑，有一定的规则性，孔隙发育较弱；浸泡后的岩样粒内溶孔发育，并有明显的溶蚀孔隙和缝隙，孔隙连通性良好，而且其结构较浸泡前疏松，呈碎屑状。%Experimental study was made on the conductivity of the deep floor limestone in Daizhuang Coal Mine in order to probe into the water-rock interaction and microscopic mechanism of the floor limestone of the lower coal seams in Jibei Coal Mining Area, study was also carried out on the microscopic mechanism of the floor limestone by fluorescence analysis and electron microscope scanning. The results showed that: ① It was found from the conductivity measurement of the limestone samples soaked by tap water and pure water that the dissolution of limestone can be divided into three stages, i. e. the fast-slow-steady stages; the solution conductivity of the limestone soaked by tap water decreased with the increase of time, but for the solution conductivity of limestone soaked by pure water, the measurement result was just contrary;② It was found from the fluorescence analysis that before and after the limestone was soaked by tap water, its chemical compositions were almost unchanged, it contains more than 90% of calcareous spar ( CaCO3 ) , a small amount of quartz ( SiO2 ) and Na, K, Mg and Al with total content less than 3%;③ It was found from electron microscope scanning that before the limestone was soaked by tap water, its microstructure is relatively dense, most in crumb structure, its cross-section is relatively smooth, has certain regularity and its pore development is relative weak;after it was soaked, the dissolution pores are well-developed, distinct dissolution pores and cracks exist, the pores are well conducted, the structure of limestone becomes loose and is in fragmental.
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