Prediction of embankment settlement over soft soils.

Details

• Creators:
  Vipulanandan, Cumaraswamy ; Bilgin, O. ; Y Jeannot Ahossin Guezo ; Vembu, K. ; and Erten, M. B.
• Corporate Creators:
  Center for Innovative Grouting Materials and Technology ; University of Houston. Department of Civil and Environmental Engineering
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Soil consolidation test
  • Embankment foundations
  • Field tests
  • Settlement (Structures)
  • Shear strength of soils--Testing
  • Soil penetration test
  • Penetrometer
  • Soils--Texas--Testing
• Publication/ Report Number:
  FHWA/TX-09/0-5530-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report, Sept. 2005-Oct. 2008
• Corporate Publisher:
  Center for Innovative Grouting Materials and Technology
• Abstract:
  The objective of this project was to review and verify the current design procedures used by TxDOT ; to estimate the total and rate of consolidation settlement in embankments constructed on soft soils. Methods ; to improve the settlement predictions were identified and verified by monitoring the settlements in two ; highway embankments over a period of 20 months. Over 40 consolidation tests were performed to quantify ; the parameters that influenced the consolidation properties of the soft clay soils. Since there is a hysteresis ; loop during the unloading and reloading of the soft CH clays during the consolidation test, three ; recompression indices (Cr1, Cr2, Cr3) have been identified with a recommendation to use the recompression ; index Cr1 (based on stress level) to determine the settlement up to the preconsolidation pressure. Based on the ; laboratory tests and analyses of the results, the consolidation parameters for soft soils were all stress ; dependent. Hence, when selecting representative parameters for determining the total and rate of settlement, ; expected stress increases in the ground should be considered. Also the 1-D consolidation theory predicted ; continuous consolidation settlement in both of the embankments investigated. The predicted consolidation ; settlements were comparable to the consolidation settlement measured in the field. Constant Rate of Strain ; test can be used to determine the consolidation parameters of the soft clay soils. The effect of Active Zone ; must be considered in designing the edges of the embankments and the retaining walls.
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• Format:
  PDF
• Funding:
  0-5530
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16765/dot_16765_DS1.pdf
• File Type:
  [PDF - 3.43 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:a491f963c8d7be6aff9a2f2696217d54fa2d686935635e292bab86fdbb2e3c72