On the basis of analyses of wellbore unstability mechanism,the changing law of shale mechanics parameters was established after shale hydration by the experimentation. 在井眼失稳机理分析的基础上，经室内实验得出泥页岩水化后岩石力学参数的变化规律。
The mechanical parameters of rock and soil are of the property of spatial variation due to inhomogeneity, so they should be properly considered as a random field. 岩土类力学介质通常为非均质体，其力学参数具有空间变异性，宜将它们视为随机场加以研究。
