岩层与地表移动问题的力学模型的选择

岩层与地在移动是一个发展的过程，从开始开采到移动结束，岩体的特性发生了很大的改变，使用力学模型解决岩层与地在移动问题必须使模型简化，但应满足合理的工程精度要求，否则将导致结论的谬误。在反算岩移参数时，可以使用采前的力学模型把开采作为边界条件模拟输入，也可使用采后的力学模型，即岩体已形成了三带。采后的力学模型由于已将来空区考虑为被岩石充填，故计算的应力可能异于顶板尚未冒落的岩休的应力。在承压水上开采和水体下开采时，应该采用采前的力学模型。

SELECTION OF THE MECHANICAL MODELS FOR STRATA AND SURFACE MOVEMENT PROLBEMS

The strata and sutface movement is a developing process,form the beginning of mining to the end of movement the characteristics of the rock beds are greafly changed.When the mechanical models are used.to solve the problems about the strata and surface movement,the model must be simpfied enough but sfill kept with rational precision of engeniering,otherwise resulting wrong conclusion. When the rock movement parametors are calculated the mechanical model before mining can be used and the advance face is considened asboundary condifion for simulation input and also the machanicgl model after mining can beused but at the time,three zones are formed in rockmass,Since the goaf is filled up by cavedrock in the mechanical model after mining.So the stress calculated from there model is deffrent from that calculated by the mechanical model before mining. The mechanical model before mining should be used of the case of mining under water bodies or above the confined water.