最大似然函数法确定渗透率有效应力系数

用实验的方法研究有效应力定律，不同的实验数据处理方法拟合效果不同，求取的有效应力系数精度存在差异。为了更准确地确定渗透率有效应力系数，采用最大似然函数法对切姆斯福德和贝雷花岗岩渗透率实验数据进行了处理分析，并将此法得到的结果和常规回归拟合方法的结果以及Bernabe 传统方法计算的结果进行对比，结果表明，最大似然函数法是可行的，并且其拟合效果比常规回归拟合精度高。

Determination of Effective Stress Coefficient of Permeability Using Maximum-Likelihood Function Approach

The effective stress law for porous media is used extensively in multi-discipline. Numerous investigations on it have been made by previous scholars, and much knowledge about it has been obtained. However, none of universally accepted result is got from it in terms of theory all the time, for accuracy of gained effective stress coefficient is of difference with matched result in core lab. In order to get more accurate the effective stress coefficient , the maximum-likelihood function approach is applied to analysis of the experimental data of permeability from Chelmsford and Barre granite, and to comparison of them with the results obtained by conventional regression matching method and by Bernabe＇s method. The results show that maximum-likelihood function approach is feasible, with higher accuracy than that obtained by conventional regression matching method. Therefore, the effective stress coefficient determined by this approach is of higher value for reference.