Summary
This paper presents two experimental and analytical studies related to overhead line (OHL) foundations. First, the three‑dimensional (3D) bearing capacity of shallow foundations was evaluated through centrifuge model tests and 3D finite‑element (FE) simulations. For the investigated cases, the full-scale FE analyses gave ultimate loads of 287 kN in soft ground and 422 kN in stiff ground, while the Terzaghi-based design formula gave 281 kN and 409 kN, respectively. The difference was therefore 2.1–3.2% for the two analysed ground conditions.
Read more Read lessSecond, the effectiveness of liquefaction countermeasures using top‑shaped concrete blocks was investigated by shaking-table tests with three cases: (1) a conventional thin gravel base layer, (2) an increased gravel base thickness only, and (3) top-shaped blocks with gravel base.
Under 3 Hz sinusoidal input with incremental acceleration, liquefaction occurred at 200 Gal in
Cases 1 and 2, whereas the block-improved case remained stable up to 250 Gal and showed smaller settlement and horizontal displacement.
These results quantify the difference between the Terzaghi-based formula and the 3D FE results for the investigated cases and indicate, within the tested range, that the top-shaped block system reduced liquefaction-induced deformation of the shallow foundation.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B2_10830_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Japan |
| Study committees | |
| File size | 2 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
OZAKI Toshiyuki - Kyushu Electric Engineering Consultants Inc. Japan; INOUE Yasutaka - Kyushu Electric Engineering Consultants Inc. Japan; TOMINAGA Yoshitaka - Kyushu Electric Engineering Consultants Inc. Japan; YASUKOCHI Yuma - Kyushu Electric Engineering Consultants Inc. Japan; KUHARA Fumiya - Kyushu Electric Engineering Consultants Inc. Japan; HORIMOTO Sosuke - Kyushu Electric Engineering Consultants Inc. Japan; YONEMORI Hisataka - Kyushu Electric Engineering Consultants Inc. Japan
Keywords
OHL foundation, Bearing capacity, Overhead line, FE analysis, Centrifuge test, Liquefaction, Countermeasure, Top-shaped concrete block
