Proceedings of 27th Annual Technological Advances in Science, Medicine and Engineering Conference 2023

Field Testing and Monitoring of Highway Bridge Supported on ACIP Piles in Clay Soil and the Performances Predicted Using Vipulanandan Models
Cumaraswamy Vipulanandan
Abstract

There is a need for verifying the performance of relatively new type of deep foundation to support the critical infrastructures and buildings around the world. In this study, supporting a state highway bridge with auger cast in-place (ACIP) piles also refereed in the literature as continuously flight auger (CFA), in clay soil replacing the drilled shafts that were used in the preliminary design for supporting the bridge was investigated.  Hence this study was a multi-phase study where the design capacity of the ACIP pile had to be verified with many other factors that control the rapid construction of the bridge.  A full-scale load test was performed to verify the constructability, axial capacity and skin friction developed in the ACIP pile supported in clay soil.  The test pile and service piles were well instrumented with vibrating wire strain gages (measures the strain and temperature) at various vertical depths and was also laterally placed to determine the curing (temperature) in the middle of the ACIP pile and also the lateral deformation of the pile during axial loading and in service. The temperature was monitored to investigate the curing of the ACIP Pile grout so that it will help to determine the time to perform the load test on the ACIP Pile. The design load for the 760 mm (30 in) pile was 1150 kN (130 tons) but the test pile was loaded to 4600 kN (520 tons), four times the design load, and the settlement was 17 mm. In addition to the full-scale load test, four (4) service piles were instrumented and monitored during the initial 600 days in service. Also lateral (new idea) and axial strains were measured using the vibrating wire strain gages. The load transfer in the service piles (skin friction and tip resistance) were within the design relationships used in the design and was compared to the load test data.  The total load carried by the service piles increased with time and varied from 523 kN to 754 kN (59 to 86 tons) and the range was 45% to 66% of the design load of the ACIP pile.  Vipulanandan p-q model and Vipulanandan three parameter correlation model were used to model the curing and the performance of the test pile and the service piles.


Last modified: 2023-06-18
Building: SickKids Hospital / University of Toronto
Room: Engineering Hall
Date: July 2, 2023 - 11:20 AM – 11:35 AM

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