Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ground Improvement under a MSE Embankment Wall in an Urban Environment
The planned Los Angeles Metro Mid City/Exposition Light Rail Project traverses a crowded urban area. The bridge over La Brea Avenue required that the mechanical stabilized earth embankment (MSE), as high as 8.2 m (27 ft), be placed on weak soils. An existing cast-in-place storm drain box runs parallel and 2.1 m (7 ft) away from the planned wall, and was not designed to take such loads. The construction team was challenged with developing a cost-effective solution for the MSE wall construction and protection of nearby utilizes. A combination of deep soil mixing, jet grouting, and chemical grouting treated the soils under the planned embankment and under the existing storm drain. An extensive site investigation was conducted and FEM analysis was used to investigate the deformation and stress distribution around the existing storm drain, and to optimize the ground improvement design. Site instrumentation, including inclinometers and settlement sensors, was placed under the embankment to verify the effectiveness of the design-build ground improvement program. This paper presents the design, analysis, soil mixing, jet grouting and chemical grouting production and quality control. Information gathered from the monitoring of the vertical and lateral displacement of the soil near the storm drain box is also presented.
Ground Improvement under a MSE Embankment Wall in an Urban Environment
The planned Los Angeles Metro Mid City/Exposition Light Rail Project traverses a crowded urban area. The bridge over La Brea Avenue required that the mechanical stabilized earth embankment (MSE), as high as 8.2 m (27 ft), be placed on weak soils. An existing cast-in-place storm drain box runs parallel and 2.1 m (7 ft) away from the planned wall, and was not designed to take such loads. The construction team was challenged with developing a cost-effective solution for the MSE wall construction and protection of nearby utilizes. A combination of deep soil mixing, jet grouting, and chemical grouting treated the soils under the planned embankment and under the existing storm drain. An extensive site investigation was conducted and FEM analysis was used to investigate the deformation and stress distribution around the existing storm drain, and to optimize the ground improvement design. Site instrumentation, including inclinometers and settlement sensors, was placed under the embankment to verify the effectiveness of the design-build ground improvement program. This paper presents the design, analysis, soil mixing, jet grouting and chemical grouting production and quality control. Information gathered from the monitoring of the vertical and lateral displacement of the soil near the storm drain box is also presented.
Ground Improvement under a MSE Embankment Wall in an Urban Environment
Diaz, Christopher (Autor:in) / Taylor, Gary (Autor:in) / Shao, Lisheng (Autor:in)
Proceedings of the Fourth International Conference on Grouting and Deep Mixing ; 2012 ; New Orleans, Louisiana, United States
Grouting and Deep Mixing 2012 ; 758-767
17.08.2012
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Grouting , Highways and roads , Chemical grouting , Anchors , Cement , Cutoffs , Piles , Mixing , California , Urban areas , Embankments , Soil stabilization , Foundations , Walls , Hydraulic structures
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