摘要
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。
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.
出处
《矿业安全与环保》
北大核心
2014年第5期9-12,16,共5页
Mining Safety & Environmental Protection
基金
陕西省自然科学基金项目(SJ08-ZT07-5)
陕西省教育厅专项科研计划项目(14JK1466)
陕西省软科学基金项目(2011KRM09)
西安科技大学培育基金项目(201308)
关键词
砂岩
砂层系数
开采沉陷
数值模拟
影响规律
sandstone
sandstone layer coefficient
mining subsidence
numerical simulation
influence rule
