Nadahini Creek Geosynthetic Reinforced Soil Integrated Bridge System
Bibliographic record
Abstract
In the fall of 2013 Government of Yukon constructed a geosynthetic reinforced soil integrated bridge system (GRS-IBS) at Nadahini Creek. The geosynthetic reinforced soil bridge constructed at Nadahini Creek is the first geosynthetic reinforced soil abutment bridge constructed by the Government of Yukon. This paper describes the project background, design and analysis of alternatives, construction of the selected alternative as well as lessons learned through project implementation. The Haines Road starts in Haines, Alaska, passes through British Columbia and ends at kilometre 246 in Haines Junction, Yukon Territory. The road serves as the only land route to Haines, Alaska which provides a ferry terminal for residents in central Alaska. Nadahini Creek is located at kilometre 109.2 of the Haines Road in British Columbia. The Government of Yukon maintains the Haines Road from the Canadian Border to Haines Junction. Nadahini Creek is a highly turbid glacial fed stream with alluvial fan morphology. Twin structural plate corrugated steel pipe arches (SPCSPA) were installed at Nadahini Creek in 1968. Throughout their life span aggraded material was occasionally cleaned out of the culverts by Highways and Public Works maintenance workers. In the summer of 2012 the culverts were aggraded with material and Highways and Public Works cleaned them out. When the bottoms of the culverts were exposed it was discovered that high amounts of sediment transport had worn through large portions of the inverts, compromising their structural integrity and posing a safety concern for traffic. Jack post supports were installed in the north culvert and Highways and Public Works began investigating design alternatives to replace the structures. Government of Yukon considered various alternatives including installing new SPCSPAs, open bottom arch culverts, a bridge on piles and a geosynthetic reinforced soil integrated bridge system (GRS-IBS). Many design factors were considered in the analysis of alternatives including formidable stream discharge values, large sediment transport and scour depths, as well as the need to accommodate fish passage. After completing a life cycle cost analysis, the GRS-IBS alternative with concrete precast box girders was selected and Government of Yukon began the design of the bridge. The GRS-IBS incorporates abutments constructed of closely spaced layers of high strength geosynthetic reinforcement in-filled with compacted granular material. The beams are seated directly on the compacted GRS abutment; no pile driving or pile caps are needed. The construction of the GRS-IBS at Nadahini Creek was constructed successfully and resulted in the conclusions that the construction of GRS-IBS are well suited for remote locations with low anticipated scour as there would be minimal excavation, minimal materials and construction time required for implementation. Using a straight facing wall opposed to a corrugated facing may also lend to ease of construction.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.020 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".