其主要手段是建立隶属函数的评价模型，确定煤炭资源开采难度等级。
It will be expounded by establishing an evaluating model of the subordinated function, and then fixing the level of the degree of difficulty in the coal resources' exploration.
针对文家坪磷矿地下开采岩体移动变形问题，给出了用于预测分析地下开采引起地表移动变形的双曲正切函数模型。
A theoretical model for predicting ground displacement and deformation due to mining of phosphate body in Wenjiaping by using hyperbolic tangent function was given in this paper.
采用正交试验方法，以岩体稳定性为原则建立目标函数，获得滨海基岩开采最佳采场结构参数。
Using the Orthogonal test method, the optimal structure parameters in subsea mining are obtained by constructing a objective function based on the principle to keep the stability of rock masses.
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