众所周知,在采用全部垮落法管理顶板的回采工作面,采空区上覆岩层内最终要形成冒落带、裂隙带和弯曲下沉带。对采场顶板管理密切有关的是冒落带和裂隙带,简称为“两带”,其高度是合理确定水体(含水冲积层)下采煤时防水煤柱尺寸的重要依据。 It is well known that in the mining face that adopts the roof caving method with full collapse method, the caving zone, fracture zone and bending sink zone will eventually form in the overlying strata of the goaf. Closely related to the roof management of the stope is the caving zone and the fractured zone, referred to as the “two zones” for short, and its height is an important basis for properly determining the size of the waterproof coal pillar during coal mining under water bodies (aquifer alluvium).