CAJ | 학술논문

煤系覆岩层状结构作为煤炭赋存的显著地质特征，在开采沉陷发生发展过程中的影响作用一直被忽视。以榆神矿区2-2主采煤层地质赋存条件和代表性钻孔资料为主要依据，在等深且基岩等厚(200 m)条件下，以砂岩层数、砂岩平均厚度和砂泥比为变量，构建了18种不同类型的覆岩层状结构简化模型。从可比性的角度提出了“砂层系数”这一能直接体现层状结构特征的新概念。在此基础上，运用结构力学分析法和数值模拟实验，研究并揭示了在既定砂泥比条件下砂层系数对下沉系数的影响规律，并建立了二者之间的量化关系。最后，阐述了煤系覆岩内砂岩层数、砂泥比对开采沉陷的影响规律在指导煤炭开采和开采沉陷防治方面的现实意义。
매계복암층상결구작위매탄부존적현저지질특정，재개채침함발생발전과정중적영향작용일직피홀시。이유신광구2-2주채매층지질부존조건화대표성찬공자료위주요의거，재등심차기암등후(200 m)조건하，이사암층수、사암평균후도화사니비위변량，구건료18충불동류형적복암층상결구간화모형。종가비성적각도제출료“사층계수”저일능직접체현층상결구특정적신개념。재차기출상，운용결구역학분석법화수치모의실험，연구병게시료재기정사니비조건하사층계수대하침계수적영향규률，병건립료이자지간적양화관계。최후，천술료매계복암내사암층수、사니비대개채침함적영향규률재지도매탄개채화개채침함방치방면적현실의의。
The layered structure of overburden strata of coal measures is a remarkable geological characteristic of coal occurrence, but its influence on the occurrence and development process of mining subsidence has been neglected. Based on the geological characteristic of 2-2 coal seam and the representative drilling in the Yushen Coal Mining Area and under conditions of the same depth and bedrock thickness, 18 simplified models with different types of layered structure of overburden strata were constructed by taking the number of sandstone layers, their average thickness and the sand-shale ratio as variables. From the angle of comparability, a new concept named “sandstone layer coefficient” that can directly reflect the characteristic of layered structure was proposed in this paper. On this basis, study was made on the influence rule of the sandstone layer coefficient upon the subsidence coefficient under the condition of the fixed sand-shale ratio through the structural mechanics analysis and numerical simulation test, and the quantitative relationship between them was constituted. Finally, the practical guiding significance of the sandstone layer number and the sand-shale ratio in the overburden strata for the coal mining and mining subsidence prevention was expounded.