An homogeneous layer is different from a sand-mud interbedded layer in many aspects, such as the lubricating action of sandy layers and the initial type of filling in shrinkage cracks.

• 单一泥质地层裂隙内充填物沉积模式与沙泥互层的多旋回地层略有差异，主要表现为沙层的润滑作用以及对早期裂隙内充填物类型的影响。