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分析了采场四边形体直接顶的结构力学特性，给出了直接顶刚度的计算方法．按刚度把直接顶分为似刚性、似零刚度和中间型刚度三类，给出了确定不同直接顶刚度类型的方法，分析了不同直接顶刚度条件下的支架工作阻力和顶板下沉量的关系．
The structural mechanics characteristics of the direct roof of quadrangular body in stope are analyzed, and the calculation method of direct roof stiffness is given. According to the stiffness, the direct top is divided into three categories: rigid, zero-stiffness and intermediate-type. The methods to determine the different types of direct top stiffness are given. The working resistance of the support and the amount of roof subsidence under different direct top stiffness are analyzed relationship.