浅埋煤层开采隔水层位移规律相似模拟研究

Simulating test on the subsidence law of subsurface water resisting layer upon shallow coalbed mining

以陕北榆树湾井田为地质原型,采用柔性隔水层物理相似模拟试验,初步得出了该井田顶板岩层及粘土隔水层在开采影响下的破坏规律,发现顶板基岩关键层仍然是隔水层稳定性控制的关键,指出隔水层下沉梯度TS为控制隔水层导水裂隙出现的指标。

The subsidence movement law of overburden and subsurface water resisting layer of Yushuwan coal field in northwestern China are studied by simulating model test. Through the specific simulating study on the simulating material of real clay of water resisting layer, the physical simulating model is made to simulate the stress-strain capacity of clay layer under mining conditions. Based on the simulating test, it is found that the movement of soft clay water-resisting layer is followed the movement of under hard layer. And the key parameter to control the stability of water resisting layer is to reduce the subsiding grade Ts, and the basic caving law of overburden roof strata is given as well.