| Abstract |
Due to shallow bedrock stratigraphy in the Rocky Mountain region, design of driven piles relies on the resistances contributed from Intermediate GeoMaterials or weak rocks. This paper presents a field load test program recently completed on HP 12 × 74 piles driven in siltstone for the I-76 bridge over York Street in Arapahoe County, Colorado. Samples of siltstone were gathered for compression tests to ascertain the characteristics of the material. An innovative static load test system was used on a test pile in the main bridge foundation system, which removed the requirement for temporary loading structures. This loading system avoids any construction delay and reduces testing cost. Applying accumulated dead loads from different bridge components and actual traffic loads to the test pile was part of the static load test procedure. Along the length of the pile, vibrating wire strain gauges were used to measure end bearing, skin resistances, and load distribution. Furthermore, dynamic load tests utilizing a pile driving analyzer with subsequent signal-matching analysis were carried out. The static and dynamic load test results were compared, and five failure criteria were examined. The differences in pile resistances ranging from 8% to 43% were observed. |
| Authors |
Nafis Bin Masud  , Kam Ng , Shaun S. Wulff
|
| Journal Info |
American Society of Civil Engineers | Rocky Mountain Geo-Conference 2024 , pages: 43 - 57
|
| Publication Date |
10/30/2024 |
| ISSN |
|
Type |
article |
| Open Access |
closed
|
| DOI |
https://doi.org/10.1061/9780784485859.004 |
| Keywords |
Siltstone (Score: 0.92441505) , Load testing (Score: 0.5420003)
|
