Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

For an in-depth understanding of the failure mechanism of loose fill slopes and the strengthening effect by soil nails, a comprehensive field study program has been carried out at a specially built slope. The test slope was constructed by end-tipping of completely decomposed granitic soils almost without any compaction. The controlled failure test program was mainly composed of surcharge at the crest, wetting with surcharge, and wetting without surcharge. This paper is aimed at a case study of the coupled hydro-mechanical response of the test slope during the recharge process with surcharge. Through a comprehensive instrumentation system, abundant monitoring data with regards to the complex performance of the loose fill and soil nails were collected. It was found that redistribution of water content within the loose fill was well consistent with the recharge program, and nonlinear deformation developed significantly in the loose fill by the reduction of shear strength due to increased pore pressure and diminished suction when subjected to large wetting loads. Also a two-dimensional simplified finite element model is established and some preliminary simulation results are presented.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Controlled Wetting Test of a Soil Nailed Loose Fill Slope: Case Study

Arlington, Virginia

For an in-depth understanding of the failure mechanism of loose fill slopes and the strengthening effect by soil nails, a comprehensive field study program has been carried out at a specially built slope. The test slope was constructed by end-tipping of completely decomposed granitic soils almost without any compaction. The controlled failure test program was mainly composed of surcharge at the crest, wetting with surcharge, and wetting without surcharge. This paper is aimed at a case study of the coupled hydro-mechanical response of the test slope during the recharge process with surcharge. Through a comprehensive instrumentation system, abundant monitoring data with regards to the complex performance of the loose fill and soil nails were collected. It was found that redistribution of water content within the loose fill was well consistent with the recharge program, and nonlinear deformation developed significantly in the loose fill by the reduction of shear strength due to increased pore pressure and diminished suction when subjected to large wetting loads. Also a two-dimensional simplified finite element model is established and some preliminary simulation results are presented.