原文传递
Use of Controlled Low-Strength Material as Abutment Backfill. Final rept. July 2001-August 2003.
| 题名： | Use of Controlled Low-Strength Material as Abutment Backfill. Final rept. July 2001-August 2003. |
| 作者： | schmitz, m. e. parsons, r. l. ramirez, g. zhao, y. |
| 关键词： | *Backfills-; *Bridge-abutments.;Settlement-; Soil-compaction; Lateral-pressure; Kansas-; Finite-element-analysis; Drainage-; Fly-ash; Laboratory-tests; Clogging-. |
| 摘要： | Use of Controlled Low-Strength Material (CLSM) behind bridge abutments has become common practice to avoid the problem of settlement when using compacted soils. CLSM solves the settlement problem within the fill but raises separate concerns. The lateral pressures that CLSM exerts on the bridge abutment are not well understood. Another concern is the potential for clogging of the drainage material on the bridge abutment. This could occur if the fly ash, cement, or water paste flows through the drainage fabric and hardens. Research was performed in a series of laboratory tests and finite element analyses to determine the lateral pressures generated by CLSM. The effect of CLSM on drainage material was also evaluated in the physical tests. For the physical testing an apparatus was constructed that was six feet tall, two feet deep, and two feet wide. One wall of the apparatus was instrumented with pressure cells at varying heights. Drainage material was also placed on the instrumented wall. The apparatus was then filled with CLSM. Fill was placed in the apparatus and pressures recorded with time. Lateral pressures in all studies peaked immediately after CLSM placement at pressures approaching full fluid pressure before dropping sharply to near zero. Pressures tended to decline most slowly at the center of the fill, which was consistent with observations of previous researchers. Finite element analyses were conducted for several CLSM-wall configurations, including the laboratory apparatus and an actual bridge design provided by KDOT with a series of loading configurations. Results from the finite element analyses predicted full fluid pressure when the fill was placed and 25-35 percent of the full fluid pressure after curing. These results were also consistent with previous field observations. |
| 报告类型： | 科技报告 |
相关文献
- FIELD TESTS OF BURIED PIPE INSTALLATION PROCEDURES.
- United States/European Union Co-ordination with HR Wallingford on Dredged Material Fate Modelling Improvements.
- Behavior of Prestressed High Performance Concrete Bridge Girders for US Highway 401 Over the Neuse River in Wake County, NC.
- MSE Wall Void Repair Effect on Corrosion of Reinforcement – Phase 2: Specialty Fill Materials.
- Global Positioning System Data Integration and Development of a Three-Dimensional Spatial Model of the Kansas Highway Network.
- Alternative Methods to Trench Backfill. Final rept.
检索历史
应用推荐
