Accession Number : AD0674347

Title :   INSTRUMENTATION FOR A CONSOLIDATION STUDY OF A CLAY DEPOSIT BENEATH AN EMBANKMENT.

Descriptive Note : Research paper,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF BUILDING RESEARCH

Personal Author(s) : Burn,K. N.

Report Date : 1959

Pagination or Media Count : 13

Abstract : In order to instrument a deep clay deposit for measurements of consolidation beneath a 23-ft-high embankment, it was necessary to develop a settlement gauge which could be installed just below the natural ground surface before the embankment was constructed. The Paper presents the considerations involved in the design of such a gauge and describes the one finally adopted. Measurements of settlements between the natural ground surface and reference elevations within the clay deposit are made by determining electrical resistances which are proportional to vertical displacements. This is accomplished by the simple gearing of a chain and sprocket to the shaft of a spirally wound potentiometer. By a judicious choice of potentiometer and sprocket pitch diameter it is possible to determine displacements to an accuracy of 0.05 in. or 1.3 mm. The field installation is described in detail and, finally, time-settlement curves for four gauges are shown. (Author)

Descriptors :   (*CLAY, SOIL MECHANICS), (*COMPRESSIVE PROPERTIES, MEASUREMENT), INSTRUMENTATION, CONSTRUCTION, SOILS, LOADS(FORCES), COMPRESSIVE PROPERTIES, ROADS, ELECTRICAL PROPERTIES, ELECTRICAL RESISTANCE, MEASUREMENT, CANADA

Subject Categories : Soil Mechanics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE