Instrumentation for measurements of lateral Earth pressure in drilled shafts.

Details

• Creators:
  Reese, Lymon C. ; Brown, James Crozier ; Dalrymple, Harold H.
• Corporate Creators:
  University of Texas at Austin. Center for Highway Research
• Corporate Contributors:
  Texas. Highway Department ; United States. Federal Highway Administration ; United States. Bureau of Public Roads
• Subject/TRT Terms:
  • Clay
  • Earth pressure
  • Foundation engineering
  • Load cells
  • Measuring instruments
  • Sand
  • Drilled shafts
  • lateral earth pressures
• Publication/ Report Number:
  Research report number 89-2, research project 3-5-65-89
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  University of Texas at Austin. Center for Highway Research
• Abstract:
  This project involves the design, construction, and testing in the ; laboratory and field of instrumentation capable of measuring the lateral ; earth pressure along a drilled shaft. ; A good deal of work" has been done concerning the development of pressure ; transducers designed to measure stresses in an earth mass. Consequently, ; these studies have produced theories which set design criteria for soil pressure ; measuring devices based on soil behavior. ; This project pulls these theories together, assimilates the present ; knowledge concerning transducers, and produces a pressure cell designed to ; measure lateral pressures against a drilled shaft up to SO psi. Design "maps" ; based on Timoshenko's theory of a clamped-edge, circular, thin plate are ; given. These "maps" allow the investigator to arrive at the thickness of a ; pressure-sensitive diaphragm knowing the desired pressure to be measured, the ; allowable diaphragm deflection to diameter ratio, and the desired sensitivity ; of the cell. The beryllium copper cell is 2-3/4 inches in diameter and 1/2 ; inch thick. ; This cell has been used to measure the pressures exerted against a ; drilled shaft under curing and loading conditions. Additional work will be ; necessary in order to evaluate completely the lateral-earth-pressure distribution ; and load transfer from the shaft to the soil. What is felt to be a ; satisfactory gage for making the necessary measurements in sands and clays ; has been developed and is recommended for these studies.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31474/dot_31474_DS1.pdf
• File Type:
  [PDF - 3.25 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:018785c306ccf2c6be49e184687ac0f37d93317826c3f896a8ac61870a720d10