flow board;shifting board

Fracture types include drainage fractures, structural fractures, interlayer fractures and microfractures in grains.

发育的裂缝类型有泄水缝、构造缝、层间缝和颗粒内微裂缝等类型,其中泄水缝和构造缝较为发育,颗粒内微裂缝次之。