Case Histories: Evaluation of Drilled Pier Integrity by the Stress Wave Propagation Methodby Larry D. Olson, CTL/Thompson Inc, Denver, CO, USA,
Robert W. Thompson, CTL/Thompson Inc, Denver, CO, USA,
Abstract: The Stress Wave Propagation Method (SWPM) was used to nondestructively investigate the integrity of straight-shaft drilled pier foundations at two sites in the Denver, Colorado area. Drilled piers tested with the method were constructed using temporary steel casings seated into sedimentary bedrock. Near-surface inclusions indicated potential problems at one site. At the other site, a pier supported column settled nearly 3 inches when the third floor load was applied. Stress wave reflections were monitored with accelerometer receivers mounted on tops and sides of the piers, and geophone receivers embedded in the piers. Stress wave propagation tests with side-mounted or embedded receivers greatly aided in the interpretation of surface receiver responses. SWPM records are presented for a sound pier and a major defect at depth.
Subject Headings: Stress waves | Piers | Case studies | Wave propagation | Drilling | Surface waves | Shock waves | Site investigation | Drilled pier foundations | North America | Colorado | United States | Denver
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