Standard Test Methods for Measuring the Depth of Deep Foundations by Parallel Seismic Logging

Importancia y uso:

5.1 It is often necessary to determine the depth of deep foundation elements supporting existing structures, such as buildings and bridges, for which neither drawings nor as-built records are available. Such situations occur when the foundation loads have to be increased or when it is intended to excavate near, or even under, the structure. When the top of the foundation is inaccessible, as is the case with underwater bridge piers, the Parallel Seismic method can be used to determine the deep foundations’ depth. The method is also applicable in cases where the foundation top can be reached, but the foundation element is not testable by the Low Strain Impact Integrity Testing Method (ASTM D5882) due to the foundation type (such as diaphragm and secant-pile walls, H-piles and sheet piles) or excessive foundation slenderness.

5.2 Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing and inspection. However, users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results since the proper conduct and evaluation of parallel seismic tests requires training, special knowledge and experience. A suitably qualified engineer shall plan and supervise the acquisition of field data and the interpretation of the test results.

Subcomité:

D18.11

Volúmen:

04.09

Número ICS:

91.120.25 (Seismic and vibration protection), 93.020 (Earthworks. Excavations. Foundation construction. Underground works)

Palabras clave:

barrette; bored pile; crosshole testing; depth; deviation; drilled shaft; driven piles; inclination; integrity test; load bearing element; ultrasonic testing;