Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Geogrid Reinforcement of Piedmont Residual Soil
Soil-geosynthetic composites such as those used in Mechanically Stabilized Earth (MSE) retaining walls and embankments are experiencing widespread use, particularly in transportation applications. These structures offer substantial economic and, in some cases, performance advantages over traditional options such as reinforced concrete gravity or cantilever walls. Continued growth in the use of MSE walls, particularly in critical applications such as bridge abutments, is anticipated. Several methods for designing these structures are currently in use. Two commonly used design guidelines are published by the National Concrete Masonry Association (NCMA, 1996) and the American Association of State Highway and Transportation Officials. The NCMA guidelines are followed primarily within the private sector; the AASHTO specifications are employed in the public sector. The successful application of these or any of the other design guidelines may be distilled to two concepts, (1) proper assessment of the anticipated loading conditions and (2) proper characterization of the load transfer mechanisms between the components of the MSE systems (backfill soil, reinforcing materials, and fascia units). This research project addresses issues related to the second concept. More specifically, the research examines the interactions and load transfer mechanisms between the backfill soil and reinforcing materials. The economic advantage of MSE walls is markedly increased if on-site soils are used as the backfill material in the reinforced zone. Ideally, this backfill material is relatively clean (e.g., limited fines content) and cohesionless. Practically, this is not often available on-site. The potential economic benefit of using 'lower quality', on-site material in MSE retaining wall applications is substantial. Using on-site material would eliminate the time and expense associated with identifying and transporting select fill. This research examined the suitability of 'lower quality' backfill soil by studying the load transfer mechanisms between representative soils and geosynthetic reinforcing materials. The primary method of studying this interaction was via a series of 'pullout' tests as described in subsequent sections of this report.
Geogrid Reinforcement of Piedmont Residual Soil
Soil-geosynthetic composites such as those used in Mechanically Stabilized Earth (MSE) retaining walls and embankments are experiencing widespread use, particularly in transportation applications. These structures offer substantial economic and, in some cases, performance advantages over traditional options such as reinforced concrete gravity or cantilever walls. Continued growth in the use of MSE walls, particularly in critical applications such as bridge abutments, is anticipated. Several methods for designing these structures are currently in use. Two commonly used design guidelines are published by the National Concrete Masonry Association (NCMA, 1996) and the American Association of State Highway and Transportation Officials. The NCMA guidelines are followed primarily within the private sector; the AASHTO specifications are employed in the public sector. The successful application of these or any of the other design guidelines may be distilled to two concepts, (1) proper assessment of the anticipated loading conditions and (2) proper characterization of the load transfer mechanisms between the components of the MSE systems (backfill soil, reinforcing materials, and fascia units). This research project addresses issues related to the second concept. More specifically, the research examines the interactions and load transfer mechanisms between the backfill soil and reinforcing materials. The economic advantage of MSE walls is markedly increased if on-site soils are used as the backfill material in the reinforced zone. Ideally, this backfill material is relatively clean (e.g., limited fines content) and cohesionless. Practically, this is not often available on-site. The potential economic benefit of using 'lower quality', on-site material in MSE retaining wall applications is substantial. Using on-site material would eliminate the time and expense associated with identifying and transporting select fill. This research examined the suitability of 'lower quality' backfill soil by studying the load transfer mechanisms between representative soils and geosynthetic reinforcing materials. The primary method of studying this interaction was via a series of 'pullout' tests as described in subsequent sections of this report.
Geogrid Reinforcement of Piedmont Residual Soil
A. T. Stadler (Autor:in)
2001
154 pages
Report
Keine Angabe
Englisch
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