According to the experiment results, the subsidence ratio of strata and surface varying with time is analyzed.
根据实验结果分析了开采停止后覆岩及地表下沉率随时间变化过程。
When the ratio of mining depth to the total mining thickness is below 17, the ground surface subsidence is studied respectively according to three cases.
当矿体开采深度与回采累计垂直高度的比值小于17时,分三种情形考虑。
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