Study on the thermal and mechanical properties of fiber-reinforced soil
Başlık çevirisi mevcut değil.
- Tez No: 403354
- Danışmanlar: Prof. JIANKUN LIU
- Tez Türü: Doktora
- Konular: Petrol ve Doğal Gaz Mühendisliği, Petroleum and Natural Gas Engineering
- Anahtar Kelimeler: Fiber-reinforced soil, freeze-thaw test, dynamic triaxial test, static triaxial test, thermal conductivity test, dynamic and static constitutive model, thermal statistical-physical model
- Yıl: 2017
- Dil: İngilizce
- Üniversite: Beıjıng Jıaotong Unıversıty
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Özet yok.
Özet (Çeviri)
Understanding effect of freezing phenomenon in a soil structure is essential to foundation technology, road construction and earthwork application in a cold region. The main purpose of this work is to understand physical, mechanical and thermal properties of fiber-reinforced soil subjected to multiple freeze-thaw cycles and to predict the frost depths in eastern Turkey with the Stefan equation and a modified Berggren (ModBerg) equation. For this purpose, the physical properties including mass losses, changes of water content and height were determined on randomly distributed glass, basalt, steel and flyash-lignin fibers-reinforced soil after a number of freeze-thaw cycles. Further, the thermal characteristics of the fiber-reinforced soil were evaluated and summarized as a function of freeze-thaw cycles, fiber volume fraction, and temperature. To validate the experimental thermal results, a statistical-physical model was employed on the fiberreinforced soil under different conditions. Besides, the experimental investigation relative to the unconsolidated-undrained triaxial compression behavior of clay soil reinforced with 3 different fiber contents (0, 0.5 and 1%) of glass and basalt fibers subjected to 5 different numbers of freeze-thaw cycles (0, 2, 5, 10, and 15) and 2 flyash contents (4 and 8 %) and 5 different fiber contents (0, 0.25, 0.5, 0.75 and 1%) of lignin fiber under 2 different numbers of freeze-thaw cycles (0 and 15) were presented with different confining (100, 200 and 300kPa). Also, hyperbolic model parameters were predicted to determine the static stress-strain behaviors of fiber-reinforced soil subjected to freezethaw cycles. Moreover, a large number of dynamic triaxial tests were carried out with various fiber contents (0, 0.5 and 1%) of glass and basalt fibers, confining pressure (300, 400 and 500 kPa) and 5 different numbers of freeze-thaw cycles (0, 2, 5, 10 and 15). To validate experimental results on the dynamic parameters of fiber-reinforced soil subjected to freeze-thaw cycles, the Hardin-Drnevich model and the modified Kondner-Zelasko hyperbolic model parameters were predicted and the dynamic shear modulus was expressed by using a nonlinear model as a function of freeze-thaw cycles, volume fractions of fiber, confining pressure, and initial water content. The results showed that different fiber fractions and their mixtures could be employed as supplement additive to improve mechanical, thermal and freeze-thaw performance of subgrade soil for road construction and earthworks. Further, a close match were observed between the results of predicted and experimental for different kinds of fiber in a wide range of fiber ratios and freeze-thaw cycles.
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