Date of Award

Spring 1967

Document Type

Thesis

Degree Name

Master of Science in Civil Engineering - (M.S.)

Department

Civil Engineering

First Advisor

Tonis Raamot

Second Advisor

James M. Robbins

Third Advisor

Frederick M. Law

Abstract

A pile load test program was conducted at Newark Airport to determine the most economical piles to be utilized to support the structure in the Redevelopment of Newark Airport. The controlling criteria were the pre-determined design capacity of 50 to 100 tons for the piles and conformance to the Newark Building Code regarding the maximum allowable loads on the Airport's bearing strata and the allowable settlements for test loaded piles. Thirty-four piles, ten timber, four steel H-piles, four pre-stressed concrete, seven cobi shell and nine steel pipe piles, were driven to determine driving characteristics of the piles and the reaction of the supporting soils strata. Six piles, test loaded in conformance with the City Building Code, were used to test van Weele's theory of separating the bearing capacity of a pile into frictional and tip resistance. Three of these piles, a single concreted cobi shell, and two steel pipe piles, one of which was concreted, were instrumented along the length of the pile to determine the portion of the applied load which was assumed by the frictional resistance. All the piles tested, except for the timber piles, exceeded the design loads and the criteria of the Building Code. Van Weele's method of determining the load transferred to friction by calculating the elastic recovery of the pile was compared to the load transferred to friction by instrumenting the test piles. The frictional forces from the instrumented tests exceeded the results obtained by van Weele's method, Pile movement and peak frictional resistances for the tests were compared to shear strengths of the soil. Residual forces resulting from the pile driving and forces exerted on the instrumentation from the concrete encasement were in evidence but the values were not calculated.

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