期刊
CANADIAN GEOTECHNICAL JOURNAL
卷 56, 期 12, 页码 1889-1900出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cgj-2018-0551
关键词
cemented silty sand; shear wave velocity; microbial-induced calcium carbonate precipitation; Sporocarcina pasteurii; injection rate; injection pressures
资金
- National Science Foundation [1554056, 1537007, 1342207]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1342207, 1537007] Funding Source: National Science Foundation
Microbial-induced calcium carbonate precipitation (MICP) is a sustainable soil improvement method with the potential for improving the engineering properties of sand and silty soils and therefore their resistance to liquefaction-inducing events. Work presented herein experimentally investigates the changes in hydraulic conductivity of fine sands and silty sands as a result of MICP treatment. In addition, numerical modeling is conducted to assess the changes in allowable injection rate and radius of influence for the delivery of the MICP process at the field scale. The hydraulic conductivity of Nevada sand and silty sand with 15% fines content decreased through MICP application with the trend of reduction being similar for both soils. Numerical modeling results show that with the progress of the MICP process, injection rates can be increased for Nevada sand, but remain unchanged for Nevada sand with 15% silt content (after MICP treatment up to a shear wave velocity about 400 m/s.) The presence of fines by itself leads to generation of higher levels of pore-water pressure during the injection process, which necessitates higher strength improvement to prevent development of excessive plastic strains. Therefore, improvement in shear strength and stiffness relative to the magnitude of the hydraulic conductivity level and its rate of change during the MICP process is a key parameter in determining the radius of treatment.
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