煤系覆岩中砂岩层数对开采沉陷的影响

Influence of Sandstone Layer Coefficient in Coal Overburden on Mining Subsidence

以榆神府矿区2-2主采煤层上覆岩石层状结构及特征为地质背景,以砂岩层数、砂岩平均厚度和砂泥比为变量,构建了18种不同类型的层状结构模型。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,运用数值模拟实验方法研究了在既定砂泥比条件下砂层系数对下沉系数的影响规律,建立了二者之间的量化关系。

Taking the quantity of sandstone layers, the average thickness of sandstone and sand - mud ratio as variables, the research constructed 18 different types of layered structure under the geological background of the layered structure and characteristics of 2^-2 coal overburden in the Yushenfu coal mining area. From the angle of comparability, the article proposed a new concept named ＂ sandstone layer coefficient＂ that can reflect the characteristic of layered structure directly. On the basis, the article researched the basic law of sandstone layer coefficient impacting subsidence coefficient under the condition of fixed sand - mud ratio with numerical simulation test, and constructed the quantitative relationship between them.