Caisson Drilling Fluid Interaction With Fine Grained Bedrock

Details

• Creators:
  Sisodiya, Mitul ; Singh, Shubjot ; Zhang, Yida ; Pak, Ronald Y. S.
• Corporate Creators:
  University of Colorado at Boulder. Dept. of Civil, Environmental and Architectural Engineering
• Corporate Contributors:
  Colorado. Department of Transportation. Applied Research & Innovations Branch ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  ABAQUS Bedrock Denver Blue Claystone Detention Basins Finite Element Method Fluid Weakening Hydromechanics Laboratory Tests Numerical Analysis Pile Axial Capacity Rock Drilling Shear Strength Simulation Slaking Support Piles Water Retention

  More +
• Publication/ Report Number:
  CDOT-2020-04
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Colorado
• Corporate Publisher:
  Colorado Department of Transportation. Applied Research & Innovations Branch
• Abstract:
  This report presents a comprehensive evaluation on the effect of drilling fluid infiltration in claystone bedrock on the axial capacity of drilled caissons. The methodology of this research combines experimental testing and numerical simulations. The results obtained in the experimental phase are used to inform the numerical study. In the experimental phase, extensive laboratory experiments are conducted on claystone samples from three sites near Denver; I-70 & Colfax, I-70 & Wadsworth and C-470 & Wads (referred as site-1, 2 and 3 hereafter) to quantify the abovementioned hydro-mechanical interactions. In the second phase, Finite Element Analyses (FEA) on drilled caisson has been performed to quantify the bearing capacity reduction due to excessive wetting of the bedrock. It is predicted that for all three sites with various permeability and strength reduction characteristics, the pile capacity reduction for 4-hour wetting is less than 15%, despite several very conservative assumptions adopted in the study. It is therefore concluded that the 4-hour limitation is quite reasonable and perhaps on the conservative side for the construction of drilled caissons.
• Format:
  PDF
• Funding:
  218.03
• Collection(s):
  FAA William J. Hughes Technical Center for Advanced Aerospace US Transportation Collection
• Main Document Checksum:
  urn:sha-512:8a02129e3141981e1f64071467bbd38f731d96fbcab53b02095381d1be9666d9169709b9fc42b7f1a540bc0a89f3858b83bb33f0a958da2ed7d5340b612101bc
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/92426/dot_92426_DS1.pdf
• File Type:
  [PDF - 6.36 MB ]