本文以现场实际条件为基础进行了相似模拟实验,根据薄板理论建立了采场覆岩层间应力分析公式。证明了采场覆岩以坚硬的厚岩层为底层分组一致下沉,岩层组间出现离层和应力消失;以老顶为主体的裂隙带最下一岩层组的断裂长度决定采场的来压步距(可用新的理论公式来预计);前支承压力的形成与覆岩运动有密切关系且具有一定极限。 In this paper, similar simulation experiments are carried out based on the actual conditions in the field. According to the theory of thin plates, the stress analysis formula of overburden strata is established. It is proved that the overburden strata in the stope are uniformly subsided with hard thick rock formations as sub-group, and there is separation and stress disappearing among rock strata; the fracture length of the lowest rock strata in the fracture zone dominated by the old roof determines the stope pressure The step distance can be predicted by a new theoretical formula. The formation of the pre-bearing pressure is closely related to the overlying strata movement and has certain limit.