浅埋煤层覆岩隔水性与保水开采分类

 通过陕北浅埋煤层保水开采的模拟研究与采动损害实测，揭示采动覆岩裂隙主要由上行裂隙和下行裂隙构成，采动裂隙带的导通性决定着覆岩隔水层的隔水性。实验分析上行裂隙带发育高度的计算公式，模拟测定下行裂隙带的发育深度。基于采动裂隙发育程度与采高和隔水岩组的关系，提出以隔采比为指标的隔水性判据，由此将保水开采分为自然保水开采、可控保水开采和特殊保水开采3类，为浅埋煤层保水开采提供科学依据。

IMPERMEABILITY OF OVERBURDEN ROCK IN SHALLOW BURIED COAL SEAM AND CLASSIFICATION OF WATER CONSERVATION MINING

According to simulation model tests and water conservation of overburden rock in shallow-buried coal seam，it is revealed that the cracks of overburden rock induced by mining are mainly composed of upward cracks and downward cracks；the impermeability of overburden impermeable layer depends on the interpenetration of mining crack zone. The calculation formula of the developing height of upward crack zone is analyzed；and the developing depth of downward crack zone is also measured by simulation. Based on the relationship among developing degree of mining crack，mining height and impermeable layer，the impermeability criterion is put forward by the ratio of impermeable layer thickness to mining height. The water conservation mining is divided into 3 types，i. e. nature water conservation mining，controllable water conservation mining and special water conservation mining，which provide scientific basis for shallow buried coal seam mining.