Location
San Diego, California
Presentation Date
26 May 2010, 4:45 pm - 6:45 pm
Abstract
The purpose of this paper is to demonstrate the effectiveness of micro-bubble water injection method against soil liquefaction based on the result of seismic vibration test using large scale flexible shaking box. It is well known that soil resistance to liquefaction increases as the degree of saturation of the soil decreases, but the practical method to decrease the saturation of the soil has not been invented. The authors solved this problem by new method of injecting water containing micro-air bubbles into the ground. The method has an advantage which not only simple and cost-effective but also friendly to environment. We examined two cases, which are micro-bubble water injected sand ground and degassed water injected one, to compare the behavior of anti-liquefaction in the large scale test ground soil. As the result, it was observed that liquefaction did not occur even at maximum acceleration level of 200Gal under the condition of lowered saturation to 80% with N-value of around 7, which is loose or fragile ground. In addition, the results also could be suggested that the possibility of brand new method of “seismic avoid ground” with hybrid layered ground of air injected soil around housing foundations and liquefaction soil under the ground.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2010 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
Nagao, Koichi; Suemasa, Naoaki; Akashi, Tatsuo; and Futaki, Mikio, "Applicability Test of Soil Improvement Using Micro-Bubbles Against Soil Liquefaction" (2010). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 21.
https://scholarsmine.mst.edu/icrageesd/05icrageesd/session01b/21
Included in
Applicability Test of Soil Improvement Using Micro-Bubbles Against Soil Liquefaction
San Diego, California
The purpose of this paper is to demonstrate the effectiveness of micro-bubble water injection method against soil liquefaction based on the result of seismic vibration test using large scale flexible shaking box. It is well known that soil resistance to liquefaction increases as the degree of saturation of the soil decreases, but the practical method to decrease the saturation of the soil has not been invented. The authors solved this problem by new method of injecting water containing micro-air bubbles into the ground. The method has an advantage which not only simple and cost-effective but also friendly to environment. We examined two cases, which are micro-bubble water injected sand ground and degassed water injected one, to compare the behavior of anti-liquefaction in the large scale test ground soil. As the result, it was observed that liquefaction did not occur even at maximum acceleration level of 200Gal under the condition of lowered saturation to 80% with N-value of around 7, which is loose or fragile ground. In addition, the results also could be suggested that the possibility of brand new method of “seismic avoid ground” with hybrid layered ground of air injected soil around housing foundations and liquefaction soil under the ground.
