Accession Number : ADA136853

Title :   In Situ Determination of Liquefaction Potential Using the PQS Probe.

Descriptive Note : Final rept. Nov 78-Sep 83,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB

Personal Author(s) : Norton,W E

PDF Url : ADA136853

Report Date : Sep 1983

Pagination or Media Count : 101

Abstract : This report documents the field testing of a penetration devices, the PQS probe, capable of simultaneously measuring penetration resistance, friction resistance, and pore pressure response. The probe is evaluated as a tool to measure liquefaction related soil characteristics in situ. Of special interest is the pore pressure response during penetration and whether it is diagnostic of contractive or dilative behavior of cohesionless soils and thus their liquefaction potential. In addition, a procedure using the penetration resistance, q, to assess liquefaction potential is presented. A comparison of the PQS field test results with SPT data indicated that q is a reasonable measure of N , and it can be used to evaluate the liquefaction potential of a soil by using the simplified procedure. Three sites were evaluated using the POS probe, and it was found that the procedure worked well when the simplified procedure was appropriate. Since the quantity q is used in the analysis, any cone penetrometer that produces that quantity can be used. The advantage of using the PQS probe is that it adds the capability of determining the elevation of the ground water table and provides an indicator of cohesive soils.

Descriptors :   *Soil mechanics, *Soil tests, Soils, Failure(Mechanics), Vulnerability, Test equipment, Probes, Penetration, Friction, Resistance, Pore pressure, Response, Field tests, Louisiana, Mississippi River, Flood plains, California, Valleys, Earthquakes

Subject Categories : Soil Mechanics
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE