Geotechnical Monitoring of Deep Shoring Adjacent to Train Infrastructure-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes a remote geotechnical monitoring program for deep shoring beside train infrastructure at the Gilmore Place development in Burnaby, British Columbia.<br /><br />Monitoring established baseline structural behavior before construction, helped verify design assumptions, and provided early warning of movement, tilt, vibration, soil movement, and load changes. Instruments included an automated motorized total station, in-place inclinometers, tilt meters, extensometers, strain gauges, and anchor load cells. Data was transmitted by cellular connection to a secure website, updated hourly, with text and email alerts when readings exceeded preset thresholds.<br /><br />Baseline measurements identified diurnal and seasonal movements strongly correlated with temperature. These thermal effects continued during construction: bracing loads varied by about 400 kN daily, while anchor loads varied by roughly 10 kN. After Phase 1 shoring was completed, guideway movement was limited to about 15 mm from baseline.<br /><br />Further movements occurred as braces were removed around the free-standing piers. Pier 29 movement approached 35 mm in March 2022; jacking shifted it about 5 mm toward its original position, while strain gauges recorded increased loads in its east and west rakers. Movements of approximately 40 mm and 30 mm were also recorded during lower-brace removal at Piers 30 and 31. The team considered brace temperature changes and concrete slab shrinkage possible contributors. Delay strips and postponing upper-raker removal were used to reduce these effects.<br /><br />The monitoring system proved reliable, and its readings were verified against field surveys and jack gauges. It continues to support construction monitoring and is expected to remain in place through Phase 2.

Keywords

geotechnical monitoring

deep shoring

remote monitoring

train infrastructure

baseline measurements

structural behavior

inclinometers

tilt meters

anchor loads

construction monitoring