The caving of thick and strong roof stratum, key stratum, causes tremendous rock pressure in mine.

采场上覆岩层中的厚硬岩层, 即厚硬关键层, 其冒落会造成剧烈的矿山压力显现.

The caving of thick and strong roof stratum , key stratum , causes tremendous rock pressure in mine.

采场上覆岩层中的厚硬岩层，即厚硬关键层，其冒落会造成剧烈的矿山压力显现。

In addition to charts and tables which are meaningful to control surface subsidence and rock pressure in mining engineering, examples are also provided.

文中除给出对采矿工程中控制地表沉陷与矿山压力有意义的图表外，还提供了几个实例。

On the basis of this, the formula of the cracked range and broken-rock pressure was induced, providing a theoretical basis for calculating the reinforcing range and supporting intensity.

在此基础上，推导出巷道顶部和两帮的破碎范围与松动压力计算公式，为巷道的加固范围和支护强度计算提供了理论依据。