Control of embankment settlement field verification on PCPT prediction methods : tech summary.

Details

• Creators:
  Abu-Farsakh, Murad Y. ; Zhang, Zhongjie
• Corporate Creators:
  Louisiana Transportation Research Center
• Corporate Contributors:
  Louisiana. Dept. of Transportation and Development ; Louisiana State University (Baton Rouge, La.)
• Subject/TRT Terms:
  • Embankments and retaining walls
  • Embankments
  • Retaining walls
  • Soil tests
  • Soil consolidation test
  • Settlement (Structures)
  • Deterioration by environmental action
  • Embankments--Louisiana
  • Roads--Embankments
  • Soil consolidation--Measurement
  More +
• Publication/ Report Number:
  LTRC Report 476
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• OCLC Number:
  755096988
• Edition:
  Tech summary.
• Corporate Publisher:
  Louisiana Transportation Research Center
• NTL Classification:
  NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology ; NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures
• Abstract:
  Depending on loading and embankment height, the magnitude and progression of settlement can signifi cantly impact the safety and ; serviceability of the infrastructures that are constructed on saturated fi ne-grained soils. Therefore, the construction of embankments, ; bridge abutments, and other structures on such soils requires a reasonable estimate of the magnitude and time-rate of consolidation ; of the natural soil deposits in order to conduct a rational and safe analysis and design of these structures. ; Calculation of embankment settlement is usually made by using Terzaghi’s consolidation theory based on laboratory tests. Laboratory ; tests, such as the oedometer consolidation test, are usually conducted on small intact samples recovered from embankment ; sites at selected depths. Inevitable sample disturbance makes consolidation parameters obtained from laboratory tests not truly ; representative of the actual in-situ conditions. Moreover, laboratory testing has great diffi culty interpreting interbedded soils due ; to the limited number of samples. In contrast to laboratory tests, the piezocone penetration test (PCPT) can provide reliable results ; similar to laboratory tests in evaluating the actual strength and consolidation properties of the soil under in-situ stress and drainage ; conditions. PCPT has gained wide popularity and acceptance for subsurface investigation and soil characterization. PCPT is a robust, ; fast, and economical in-situ test that can provide continuous soundings of subsurface soil with depth. ; A research project was conducted previously at the Louisiana Transportation Research Center ; (LTRC) to evaluate the current PCPT interpretation methods for their capability to accurately ; predict the consolidation parameters needed to calculate the magnitude and time-rate of ; consolidation settlement of cohesive soils as well as the overconsolidation ratio (OCR). The ; previous research recommended new interpretation methods for constrained modulus and ; the Teh and Houlsby method for horizontal coeffi cient of consolidation. In this study, more ; embankment sites were selected to verify the settlement prediction method based on PCPT and ; dissipation tests.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23070/dot_23070_DS1.pdf
• File Type:
  [PDF - 186.17 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ee0b5c3bf01013f151091963eb16adbd3927d313ff29d40e28549fcfa81531898099ca58e2d1d2fb07b46b9f2172222b5f0e4127bf4e810bc7760f790c83d292