Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Microbially induced carbonate precipitation for improving the internal stability of silty sand slopes under seepage conditions
https://orcid.org/http://orcid.org/0000-0002-5050-0260
Biocementation based on the microbially induced carbonate precipitation (MICP) process can be used as a soil improvement method to improve the mechanical strength of granular soils. In this study, triaxial consolidated drained (CD) tests and constant shear drained (CSD) tests were carried out to evaluate the applicability of MICP as a method to mitigate suffusion and improve the internal stability of silty sands under seepage conditions. The CD test results demonstrated that biocementation is efficient in terms of strength improvement and deformation control of silty sand. The shear strength and the slope of failure line in p’-q plane increased with the number of treatment cycles at various levels of soil density. The CSD tests simulated the concurrent seepage-constant shear drained conditions that can trigger suffusion and instability of slopes. Results showed that the stress ratio q/p’ and the hydraulic gradient at which the biocemented samples became unstable were higher than those of the untreated samples, which suggests that biocementation can effectively improve the stability of soils under concurrent seepage-constant shear drained conditions. Additionally, the biocemented samples also have stronger resistance against suffusion compared with untreated samples showing lower amount of eroded fine particles. Suffusion resistance improved with the number of treatment cycles and soil density.
Microbially induced carbonate precipitation for improving the internal stability of silty sand slopes under seepage conditions
https://orcid.org/http://orcid.org/0000-0002-5050-0260
Biocementation based on the microbially induced carbonate precipitation (MICP) process can be used as a soil improvement method to improve the mechanical strength of granular soils. In this study, triaxial consolidated drained (CD) tests and constant shear drained (CSD) tests were carried out to evaluate the applicability of MICP as a method to mitigate suffusion and improve the internal stability of silty sands under seepage conditions. The CD test results demonstrated that biocementation is efficient in terms of strength improvement and deformation control of silty sand. The shear strength and the slope of failure line in p’-q plane increased with the number of treatment cycles at various levels of soil density. The CSD tests simulated the concurrent seepage-constant shear drained conditions that can trigger suffusion and instability of slopes. Results showed that the stress ratio q/p’ and the hydraulic gradient at which the biocemented samples became unstable were higher than those of the untreated samples, which suggests that biocementation can effectively improve the stability of soils under concurrent seepage-constant shear drained conditions. Additionally, the biocemented samples also have stronger resistance against suffusion compared with untreated samples showing lower amount of eroded fine particles. Suffusion resistance improved with the number of treatment cycles and soil density.
Microbially induced carbonate precipitation for improving the internal stability of silty sand slopes under seepage conditions
https://orcid.org/http://orcid.org/0000-0002-5050-0260
Biocementation based on the microbially induced carbonate precipitation (MICP) process can be used as a soil improvement method to improve the mechanical strength of granular soils. In this study, triaxial consolidated drained (CD) tests and constant shear drained (CSD) tests were carried out to evaluate the applicability of MICP as a method to mitigate suffusion and improve the internal stability of silty sands under seepage conditions. The CD test results demonstrated that biocementation is efficient in terms of strength improvement and deformation control of silty sand. The shear strength and the slope of failure line in p’-q plane increased with the number of treatment cycles at various levels of soil density. The CSD tests simulated the concurrent seepage-constant shear drained conditions that can trigger suffusion and instability of slopes. Results showed that the stress ratio q/p’ and the hydraulic gradient at which the biocemented samples became unstable were higher than those of the untreated samples, which suggests that biocementation can effectively improve the stability of soils under concurrent seepage-constant shear drained conditions. Additionally, the biocemented samples also have stronger resistance against suffusion compared with untreated samples showing lower amount of eroded fine particles. Suffusion resistance improved with the number of treatment cycles and soil density.
Microbially induced carbonate precipitation for improving the internal stability of silty sand slopes under seepage conditions
Acta Geotech.
Hang, Lei (Autor:in) / Gao, Yufeng (Autor:in) / van Paassen, Leon A. (Autor:in) / He, Jia (Autor:in) / Wang, Liya (Autor:in) / Li, Chi (Autor:in)
Acta Geotechnica ; 18 ; 2719-2732
01.05.2023
14 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Biocement , Constant shear drained test , Internal stability , Microbially induced carbonate precipitation , Silty sand slope , Soil improvement Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
| British Library Online Contents | 2017