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运用“传递岩梁”理论建立了大采高采场结构力学模型,探讨了大采高采场的覆岩结构及运动规律,修正了大采高下直接顶及基本顶概念,确立了支架载荷的计算方法.研究表明:“给定变形”状态,支架缩量应大于顶板下沉量;“限定变形”状态,支架阻抗力与岩梁位态有关.采高增大,直接顶厚度可能大幅度增加,直接顶中出现大跨度悬顶坚硬岩层的几率增大.影响采场矿压显现的“传递岩梁(基本顶)”范围相对减少,相关“岩梁”距采场的高度增大.准确地确定悬顶位置、厚度及可能的最大悬跨度是大采高采场顶板控制设计及支架选型计算的关键.
The mechanics model of large mining and high stope is established by using the theory of “transferring rock beam”, the overlying strata structure and movement law of large mining height stope are discussed, the concepts of direct roof and basic roof under large mining height are revised, The calculation method of the support load shows that the support shrinkage should be greater than the roof subsidence and the support deformation resistance is related to the rock beam status. , The direct top thickness may increase drastically, and the probability of occurrence of large-span cantilevered hard rock formations will increase in the direct top. "The relative reduction of the rock mass (basic top) The height of the beam from the stope increases.Determining the position and thickness of the suspended ceiling and the maximum possible span is the key to the roof control design and scaffold selection calculation of the large mining height stope.