Instrumentation for measurements of lateral Earth pressure in drilled shafts.
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1968-09-01
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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.
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