To friable rock mass in the goaf, numeric model using the 3-D finite difference method is established to analyze it.

针对采空区内的松散岩体，运用三维有限差分法建立了数值模型对其进行分析；

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To friable rock mass in the goaf, numeric model using the 3-D finite difference method is established to analyze it.

针对采空区内的松散岩体，运用三维有限差分法建立了数值模型对其进行分析；

youdao