investigation of flow regime in pore water flow through soil in crs consolidation test
نویسندگان
چکیده
the consolidation test method proposed by terzaghi and used in most soil mechanic laboratories has limitations and weaknesses. to get correct results, improvement and modification of the test method is essential. several experimental methods, such as constant loading rate, gradient and constant rate of strain (crs) have been used over the past 40 years. of these methods, crs is more advantageous and is more popular, but there is no unique criterion for when to use the test, although many researchers have proposed different methods. considerable differences exist between standards in the literature. the present study investigates the causes of differences between standards by investigating basic assumptions about flow regime caused by pore water loading during consolidation. crs consolidation tests were carried out using an mit consolidometer under different strain rates. the results indicate that a darcy flow regime is not valid throughout the crs test, thus, a consolidation equation based on the darcy flow regime cannot model the test correctly. also the present research showed three different flow regimes during the test for strain rate, including prelinear (non-darcy), linear (darcy low) and postlinear (non-darcy).
منابع مشابه
investigation on hydraulic conditions in crs consolidation test and a method to determination of pore water flow regime
abstract at present study constant rate of strain (crs) consolidation under non-darcy condition was investigated. in this study a governing conditions of drainage pore water were investigated using proposed equation. the crs experiments under different rates of strain were conducted on different soil samples. results these experiments and there comparison with proposed equation showed that flow...
متن کاملeffect of strain rate on variation of pore water presser in crs consolidation test
constant rate of strain (crs) consolidation is a rapid test method used for determination of compressibility of clayey soils. in a crs test, the appropriate strain rate is selected based on pore water pressure ratio, i.e. the ratio of pore pressure to total stress. in the present study, to investigate the effect of strain rate on variation of relative pore water pressure, four different clay sa...
متن کاملInvestigation of Heat Transfer Coefficient of Ethylene Glycol/ Graphenenanofluid in Turbulent Flow Regime
In the present work, graphene was synthesized by chemical vapor deposition (CVD) method. The structure of graphene was then confirmed by X-Ray diffraction (XRD) and scanning electron microscope (TEM) images. After that, mixed acid method (H2<span style=...
متن کاملthe effects of changing roughness on the flow structure in the bends
flow in natural river bends is a complex and turbulent phenomenon which affects the scour and sedimentations and causes an irregular bed topography on the bed. for the reason, the flow hydralics and the parameters which affect the flow to be studied and understand. in this study the effect of bed and wall roughness using the software fluent discussed in a sharp 90-degree flume bend with 40.3cm ...
Visual Observation of Flow Regime Transition in Downward Vertical Gas-Liquid Flow Using Simple Mixer
Different flow patterns of downward gas-liquid two-phaseflow using simple mixer are studied in an experimental manner. An experimental setup is designed and fabricated to allow the visual observation of downward two-phase flow patterns and their transitions. The flow patterns are recorded by a 1200 frames per second high speed video camera. The quality of downward two-phase flow patterns photos...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
تحقیقات مهندسی کشاورزیجلد ۱۰، شماره ۴، صفحات ۲۵-۳۸
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023