Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

Expansive soils are fine-grained soils that can undergo a significant volume change due to the variation of water content. A change in the water content of weak subgrade material under the roadway is a cause for the damage of the road pavement. During an earthquake, the soft clay will lose the small shear strength it possesses which causes cracks and movements of the road. In the present study, soil samples were collected from Banda, Uttar Pradesh, India. The study area is at risk for seismic damage due to Himalayan frontal fault earthquakes. The soils samples are highly expansive in nature and used in road subgrade. The clay soil is treated with Rice Husk Ash and Portland cement slag. Strain control cyclic triaxial tests were carried out on the stabilized clay for different amplitudes of shear strain at frequency of 0.5Hz and 100kPa effective confining pressure. The damping ratios increase with increase in amplitude of shear strain and vary from 7-9% to 14-19% for γ= 0.4%to 1% respectively. The shear modulus decreases with increase in amplitude of strain. The modulus of degradation index decreases at a very fast rate for the first 50 cycles.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Dynamic Properties of Stabilized Subgrade Clay Soil

Chicago, Illinois

Expansive soils are fine-grained soils that can undergo a significant volume change due to the variation of water content. A change in the water content of weak subgrade material under the roadway is a cause for the damage of the road pavement. During an earthquake, the soft clay will lose the small shear strength it possesses which causes cracks and movements of the road. In the present study, soil samples were collected from Banda, Uttar Pradesh, India. The study area is at risk for seismic damage due to Himalayan frontal fault earthquakes. The soils samples are highly expansive in nature and used in road subgrade. The clay soil is treated with Rice Husk Ash and Portland cement slag. Strain control cyclic triaxial tests were carried out on the stabilized clay for different amplitudes of shear strain at frequency of 0.5Hz and 100kPa effective confining pressure. The damping ratios increase with increase in amplitude of shear strain and vary from 7-9% to 14-19% for γ= 0.4%to 1% respectively. The shear modulus decreases with increase in amplitude of strain. The modulus of degradation index decreases at a very fast rate for the first 50 cycles.