自然崩落法放矿基本上都是在覆盖岩层下进行的。
The process of ore- drawing in block caving is completed under overburden.
结果表明，随矿岩崩落开采，崩落区下方岩层出现较大范围的塑性破坏区和拉破坏区。
The results show that the great plastic yield areas and pull failure areas are formed in the base structure with caved area extends.
关键层较难崩落，但在崩落时具有突发性，会产生较大厚度岩层的突然垮塌。
The key stratum is not easy to cave, but once it is caved, there will be a sudden collapse of a rather thick stratum.
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