چکیده مقاله
Microbial Geotechnology can be considered as a branch of Geotechnical Engineering aiming to improve the mechanical properties of soil so that it will be more suitable for construction or environmental purposes Indraratna and Chu, 2005 There are two approaches in Microbial eotechnology: bioclogging and biocementation Ivanov and Chu, 2008; Mitchell and Santamarina, 2005 Bioclogging is the production of porefilling materials through microbial activity so that the porosity and hydraulic conductivity of soil can be reduced Biocementation is generation of particle binding materials through microbial activity in situ so that the shear strength of soil can be increased Bioclogging could be used for the following construction and geotechnical applications: 1 to reduce drain channel erosion; 2 form grout curtains to reduce the migration of heavy metals and organic pollutants; 3 prevent piping of earth dams and dikes; 4 construction of aquacultural ponds; 5 construction of reservoirs Ivanov and Chu, 2008 Biocementation could be used for the following construction and geotechnical applications: 1 to control erosion in coastal area and rivers; 2 construction of aquacultural ponds ; 3 construction of reservoirs; 4 construction of dams; 5 to reduce the liquefaction potential of soil; 5 to enhance the stability of slopes and dams; 6 to produce strong filling material from soft soil; 7 soil stabilization in land reclamation; 8 increasing the bearing capacity of foundations; 9 treatment of surfaces to reduce radioactive or toxic dust levels; 10 to increase the resistance of boreholes on oil and gas fields; 11 immobilization of the soil pollutants Ivanov and Chu, 2008 Bioclogging and biocementation can be considered as the specific types of soil grouting Chemical grouting of soil is a common technique in civil engineering Karol, 2003 However, chemical grouting could be more expensive than biogrouting and many chemical grouts are toxic for human and environment Advantages of biocement in comparison with the conventional cement are as follows: 1 it is less energy consuming material; 2 the solutions of biocement have low viscosity and can penetrate into the porous soil by gravity Hypothetically, the most suitable microorganisms for soil bioclogging or biocementation are facultative anaerobic and microaerophilic bacteria, although anaerobic fermenting bacteria, anaerobic respiring bacteria, and obligate aerobic bacteria may also be suitable to be used in eotechnical engineering Ivanov and Chu, 2008 Due to complexity, the applications of microorganisms in Geotechnical Engineering require an integration of microbiology, ecology, geochemistry, and geotechnical engineering The aim of our research was to examine application of different microorganisms for biocementation
کلیدواژهها
نویسندگان
Volodymyr Ivanov
School of Civil and Environmental Engineering, Nanyang Technological University, ۵۰ Nanyang Avenue, Singapore ۶۳۹۷۹۸
Jian Chu
Volodymyr Ivanov School of Civil and Environmental Engineering, Nanyang Technological University, ۵۰ Nanyang Avenue, Singapore ۶۳۹۷۹۸He JiaGuo Chenghong
He Jia
Volodymyr Ivanov School of Civil and Environmental Engineering, Nanyang Technological University, ۵۰ Nanyang Avenue, Singapore ۶۳۹۷۹۸Jian ChuGuo Chenghong
Guo Chenghong
Volodymyr Ivanov School of Civil and Environmental Engineering, Nanyang Technological University, ۵۰ Nanyang Avenue, Singapore ۶۳۹۷۹۸Jian ChuHe Jia
شیوه ارجاع
Ivanov, Volodymyr and Chu, Jian and Jia, He and Chenghong, Guo,1388,Bioclogging and Biocementation of Soil in Geotechnical Engineering,8th International Congress on Civil Engineering,Shiraz
ارائهشده در
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