Predicting the coefficient of permeability of soils using the Kozeny-Carman equation

دسته بندی: ژیدروژئولوژی
ویرایش:  
نویسندگان: Chapuis Robert P.,  Aubertin Michel.  
سری:  
 
ناشر:  
سال نشر:  
تعداد صفحات: 35 
زبان: English 
فرمت فایل : PDF (درصورت درخواست کاربر به PDF، EPUB یا AZW3 تبدیل می شود) 
حجم فایل: 10 مگابایت 

قیمت کتاب (تومان) : 52,000

EPM-RT-2003-03
Department CGM, Ecole Polytechnique de Montreal
P.O. جعبه 6079، Sta. CV, Montreal, QC, Canada, ЮС 3A7
ایمیل: robert.chapuis@polymtl.ca
ژانویه 2003
31 صفحه

EPM-RT-2003-03
Department CGM, Ecole Polytechnique de Montreal
P.O. Box 6079, Sta. CV, Montreal, QC, Canada, ЮС 3A7
E-mail: robert.chapuis@polymtl.ca
January 2003
31 pages Abstract
The saturated hydraulic conductivity of a soil can be predicted using empirical relationships, capillary models, statistical models and hydraulic radius theories. A well-known relationship
between permeability and properties of pores was proposed by Kozeny and later modified by
Carman. The resulting equation is largely known under the name of Kozeny-Carman, although
these authors never published together. In the geotechnical literature, there is a large consensus
that the Kozeny-Carman (КС) equation applies to sands but not to clays. Such opinion, however,
is supported only by partial demonstration. This report evaluates the background and the validity
of the КС equation with laboratory permeability tests. Considered test results were taken from
publications that provided all information needed to make a prediction: void ratio, and either the
measured specific surface for cohesive soils, or the gradation curve for non-cohesive soils. This
report shows how to estimate the specific surface of a non-cohesive soil from its gradation curve.
The results presented here show that, as a general rule, the КС equation predicts fairly well the
saturated hydraulic conductivity of most soils. Many of the observed discrepancies can be
related to either practical reasons (e.g. inaccurate specific surface value, steady flow not reached,
unsaturated specimens, etc.) or theoretical reasons (some water is motionless, and the predictive
equation is isotropic whereas hydraulic conductivity is an anisotropic property). Theses issues
are discussed in relation to the predictive capabilities of the КС equation.