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根据伺服渗透试验获得的应力-应变和渗透率-应变关系曲线,分析了全应力-应变过程中软岩的渗透性随变形的变化特点,得出全应力-应变过程中岩样渗透率可划分为5个阶段;结合软岩的应力与渗透率关联性拟合曲线可以得出:软岩渗透率具有滞后性,即渗透率的峰值往往在应力的峰值之后;通过多项式和指数函数方程对软岩的应力与渗透率关联性进行回归分析可以看出,2种函数方程拟合的曲线相关系数都接近于1,表明相关性较好,且用多项式拟合的相关系数要比用指数函数拟合的高,表明用多项式拟合的效果比指数函数更好,但多项式的数学表达式却相对比较复杂。
According to the curves of stress-strain and permeability-strain obtained from the servo penetration test, the permeability characteristics of soft rock under full stress-strain are analyzed. The results show that the permeability of rock samples during the whole stress-strain process can be divided into According to the fitting curve of the correlation between stress and permeability of soft rock, it can be concluded that the permeability of soft rock has a hysteresis, that is, the peak of permeability is often behind the peak of stress. By using the polynomial and exponential function equations, Regression analysis of the correlation between stress and permeability shows that the correlation coefficients of the two kinds of function equation fitting curves are close to 1, indicating that the correlation is good, and the correlation coefficient fitting by polynomial is better than that by exponential function , Indicating that polynomial fitting works better than the exponential function, but polynomial mathematical expressions are relatively complex.