ALTERNATIVE METHOD OF DETERMINING RESILIENT MODULUS OF COMPACTED SUBGRADE SOILS USING FREE-FREE RESONANT COLUMN TEST

An alternative procedure of determining the resilient modulus (M sub R) of compacted subgrade soils using a free-free resonant column (FF-RC) test is proposed. The FF-RC test was used to determine a small-strain Young's modulus (E sub max) and Poisson's ratio on the basis of the elastic wave propagation theory. Resonant column (RC) and torsional shear (TS) tests were performed to investigate the effects of loading frequency and strain amplitude on the resilient modulus of subgrade soils. By performing FF-RC, RC/TS, and M sub R tests on the synthetic specimens of known stiffnesses, the feasibility of using the FF-RC test to measure the M sub R was evaluated and the M sub R testing equipment was calibrated. Moduli of subgrade soils determined by FF-RC tests match well with values obtained from RC and TS tests at small strains, indicating that the FF-RC test can provide a reliable estimation of E sub max, if the effects of loading frequency are considered. In the proposed method, E sub max obtained from the FF-RC test can be combined with the effect of loading frequency and the modulus reduction curve determined by the data base of the RC and TS tests for the compacted subgrade soils of various plasticity indexes. Moduli obtained from the proposed method overlapped nicely with M sub R values determined by standard M sub R testing, showing the capability of the proposed method being used in determining M sub R values, provided that the effects of loading frequency and modulus reduction curve are considered.

• Record URL:
  • https://doi.org/10.3141/1577-08
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=ALTERNATIVE+METHOD+OF+DETERMINING+RESILIENT+MODULUS+OF+COMPACTED+SUBGRADE+SOILS+USING+FREE-FREE+RESONANT+COLUMN+TEST&author=D.+KIM&author=G.+Kweon&author=K.+Lee&publication_year=1997
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309061598
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1577, Pavement Base and Foundation Materials, Deformation Characteristics of Subgrade, and Properties of Unconventional Aggregates.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • KIM, D-S
  • Kweon, G-C
  • Lee, K-H
• Publication Date: 1997

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 62-69
• Serial:
  • Transportation Research Record
  • Issue Number: 1577
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Modulus of elasticity; Modulus of resilience; Poisson distributions; Poisson ratio; Shear tests; Subgrade (Pavements); Torsion
• Uncontrolled Terms: Loading frequency
• Old TRIS Terms: Free-free resonant column tests; Resonant column tests; Torsional shear tests
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00741963
• Record Type: Publication
• ISBN: 0309061598
• Files: TRIS, TRB, ATRI
• Created Date: Oct 20 1997 12:00AM