It shows that, in displacement-based seismic design, we also should improve the target roof displacement computing method based on the value of r.
这意味着在基于位移的设计中，还应该以R取值为依据，对顶点目标位移的确定方法进行修正。
Roof Support elevation, the axis displacement and cross-deflection, the measurement made by the record.
屋架支座的标高、线位移、中挠度，经测量做出记录。
The numerical results show that the displacement of the overlying strata is nonlinear, and it gets smaller with the increase of the roof height.
数值模拟结果显示上覆岩层的移动是非线性的，上覆岩层的沉降位移随着距离采场顶板的高度增大而减小。
When the roof damaged, the displacement mutation occurred and the calculations did not converge.
当顶板发生破坏时，其位移发生突变，计算不收敛。
Therefore, how the displacement mutation and calculation convergence happened can be as a criterion to judge the roof damage.
因此，将监测点位移是否突变、计算是否收敛作为顶板破坏的判据。
So the minimal uncontrolled roof-fall span, displacement Angle and caving Angle are studied by similarity simulation.
借助相似模拟试验，研究了顶板自然垮落的最小跨度、移动角和垮落角。
So the minimal uncontrolled roof-fall span, displacement Angle and caving Angle are studied by similarity simulation.
借助相似模拟试验，研究了顶板自然垮落的最小跨度、移动角和垮落角。
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