Location
Arlington, Virginia
Date
15 Aug 2008, 11:00am - 12:30pm
Abstract
The trench remixing and deep wall method (TRD) is a one-phase process for excavation and in situ mixing of a vertical barrier. While the TRD method was developed and has been widely employed in Japan for more than a decade, it has only recently been used in the United States. Since the TRD method mixes the entire depth of the vertical profile, this method can be used to construct a more homogeneous wall than other in situ methods. Using a large revolving chain and cutter bar, the TRD equipment simultaneously excavates and mixes in situ soils and added slurry resulting in a continuous soil mixed wall. The blend of slag, Portland cement and clay-water slurry is added as the excavation moves along the alignment of the barrier and produces continuous vertical mixing of in situ soils with the added blend. This paper presents a case study of the first TRD project in the United States involved the construction of closed cells to allow full evaluation of the method. This installation was part of a larger evaluation of the use of a vertical passive barrier to prevent the intrusion of salt water into fresh ground water aquifers in Southern California. The paper describes the site characterization, an extensive laboratory study conducted to investigate the appropriate mix design, field construction and post-construction testing. The case study shows the methodology used to develop design mixtures and presents information showing the successful completion of a barrier wall by the TRD method.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
6th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2008 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Evans, Jeffrey C., "Alamitos Gap: A Case Study Using the Trench Remixing and Deep Wall Method" (2008). International Conference on Case Histories in Geotechnical Engineering. 1.
https://scholarsmine.mst.edu/icchge/6icchge/session05/1
Alamitos Gap: A Case Study Using the Trench Remixing and Deep Wall Method
Arlington, Virginia
The trench remixing and deep wall method (TRD) is a one-phase process for excavation and in situ mixing of a vertical barrier. While the TRD method was developed and has been widely employed in Japan for more than a decade, it has only recently been used in the United States. Since the TRD method mixes the entire depth of the vertical profile, this method can be used to construct a more homogeneous wall than other in situ methods. Using a large revolving chain and cutter bar, the TRD equipment simultaneously excavates and mixes in situ soils and added slurry resulting in a continuous soil mixed wall. The blend of slag, Portland cement and clay-water slurry is added as the excavation moves along the alignment of the barrier and produces continuous vertical mixing of in situ soils with the added blend. This paper presents a case study of the first TRD project in the United States involved the construction of closed cells to allow full evaluation of the method. This installation was part of a larger evaluation of the use of a vertical passive barrier to prevent the intrusion of salt water into fresh ground water aquifers in Southern California. The paper describes the site characterization, an extensive laboratory study conducted to investigate the appropriate mix design, field construction and post-construction testing. The case study shows the methodology used to develop design mixtures and presents information showing the successful completion of a barrier wall by the TRD method.
