原岩应力与煤层底板隔水层阻水能力的关系

THE RELATIONS OF IN-SITU ROCK STRESS AND WATER- RESISTING ABILITY FOR FLOOR AQUIFUGE

介绍了水力压裂应力测量的原理和现场测量结果 ,论述了煤层底板隔水层带的阻水机理和承压水沿煤层上升的机理 ,以及原岩应力、水压与裂隙扩展的关系。指出对于厚底板隔水层 ,原岩应力起着阻止底板承压水上升和突出的作用 ,对于薄底板隔水层 ,原岩应力起着破坏底板、导致承压水突出的作用。

It is introduced that the principle and stress measurement data achieved by hydraulic pressure fracturing method.This paper discusses the mechanisms of impermeable layer water resisting in coal seam floor and the confined water rising along the fractures,as well as the relationship of in situ rock stress,confined water pressure and fracture extension.The in situ rock stress prevents the rise of confined water and water inrush for thick floor aquifuge,but for thin floor aquifuge the in situ rock stress would break coal seam floor,resulting in confined water inrush.