试验数据回归结果的评价方法

确定一些参数之间的关系通常采取回归的方法，而岩石力学的试验数据总是具有离散性，因此，对回归结果的可靠性需要作出评价。以Coulomb强度准则的回归为例，采取减少或增加部分试验数据和改变岩样使用顺序进行“假想试验”这两种方法，研究了回归结果的误差，从而可以给出内摩擦角在某一可信度下的取值范围，并具体分析了试验围压范围对回归结果的影响。

EVALUATION METHODS TO REGRESSION RESULT OF EXPERIMENTAL DATA

Regression is usually used to determine the relation among some testing parameters. Experimental data of rock mechanics are often dispersive, and the reliability of the regression result must be evaluated. In this paper, two methods to review the error of regression are given on the Coulomb criterion. One is to regress again after decreasing or repeatedly using some data. The other is to do 'hypothetical experiments' after arranging the specimens in various confining pressures. A certain range of the rock parameter like internal friction angle with certain reliability can be given. The effect of confining pressure range on the regression results of strength criterion is also discussed.