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.
同时，还解决了两体问题。突破了传统上的对双质点力学体系的一般处理方法，收到了举一反三的效果。
It is also a break away from the traditional treatments of two-particle system, and better results can be obtained.
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