深部含水层渗透系数均匀试验研究

通过高应力作用下深部含水层19个试样的渗透系数均匀试验研究表明:渗透系数与有效应力呈指数衰减的变化规律,其表达式的回归系数受特征粒径D50,D30,D20和特性参数Cu以及孔隙率n的综合影响。试验研究和方差分析表明:零载荷下的渗透系数由n和D20决定;有效应力的影响系数受D50,D30和Cu控制,其中,D30的影响最为显著;D50越大、D30越小、Cu越小,则有效应力的影响系数越大。研究结果表明:高压力作用下渗透系数的变化规律及数值的大小可通过土体的颗粒级配参数和土体内有效应力的大小来预测。

UNIFORM EXPERIMENTAL STUDY ON PERMEABLE COEFFICIENT OF DEEP AQUIFER

By experiment setting that is developed by the authors and based on the theory of uniform design, uniform experimental study on permeable coefficient in 19 samples from the aquifer under high stress indicates that the permeable coefficient and effective stress can be expressed by damped exponential function. The study also shows that the regression coefficients are synthetically influenced by characteristic grains D50 , D30 and D20 ,and characteristic parameter Cu and the porosity n . Both the experimental study and the variance analysis identify that the value of permeable coefficient under zero stress is determined by n and D20 ;and the effective influencing coefficient of stress is controlled by D50 , D30 and C u ,especially by D30 . The larger the value of D50 is the smaller the values of D30 and Cu are,the larger the values of effective stress influencing coefficient are. This research points out that the law and value of permeable coefficient in deep aquifer can be predicted by characteristic grain,characteristic parameter,and effective stress of soil.