Pile Load Test Monitoring

Successful Results

Location: Delta, BC, Canada

The consultant was able to obtain high quality real-time data for the various parameters they monitored. Without the custom solutions RST provided, the data quality would not have been sufficient.

Potential safety concerns and costly disruptions related to the impact of the pile testing on the existing tunnel were minimized.

Background

The Massey Tunnel in Delta, BC was built in the 1950s and is a congested tunnel structure. It averages 86,000 vehicle trips through it on a daily basis. A replacement bridge (Massey Bridge) was proposed to replace the tunnel and improve traffic congestion. The proposed capital cost of the project was $3.5 billion.

Scope/Objective

The replacement bridge design required a pile load test for a 2m diameter, 67m long, 60MN capacity steel pipe pile which required driving five 2m diameter pipe piles (1 test pile and 4 reaction piles) adjacent to the existing, operating Massey Tunnel. During the pile load test, the following parameters were monitored: loading from the hydraulic jacks, load transfer down the pile and displacement of the pile.

Challenges

Due to the complex nature of the project, and the large capacity of the proposed bridge piles, traditional instrumentation was not suitable for the test. The driving of 5-2m pipe piles adjacent to the tunnel required crack and vibration monitoring of the existing tunnel structure. The project site is adjacent to the Fraser River where the ground consists of unconsolidated, fine-grained, river sediments which are prone to settlement and liquefaction under seismic conditions.

Solution

RST worked in collaboration with Golder Associates to supply an elaborate instrumentation package, which included custom products, to precisely monitor the pile load test in the challenging environment.

Benefits

The custom instrumentation allowed Golder to monitor the site parameters in real-time to allow for quick decisions to be made during the test, and for full analysis later on. Potential safety concerns and costly disruptions related to the impact of the pile testing on the existing tunnel were minimized.

Partners Featured In This Success Story

BC Ministry of Transportation and Infrastructure

Speak with an Expert

I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
 
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd