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结合非线性回归分析，用灰色系统理论分析围岩稳定性，提出了围岩失稳的必要条件和几种提高模型精度的方法，并对围岩的失稳进行灰色预报．初步检验结果表明该方法具有一定的精度和实用价值．
Combined with the nonlinear regression analysis, the gray system theory is used to analyze the stability of the surrounding rock. The necessary conditions for the surrounding rock instability and several methods to improve the precision of the surrounding rock are proposed. The gray forecasting of the rock instability is carried out. The preliminary test results show that the method has certain accuracy and practical value.