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Nonlinear Failure Envelope for Microbial Induced Calcium Carbonate Precipitation Treated Sand
Microbial induced calcium carbonate precipitation (MICP) has drawn significant attention as a more sustainable and eco-friendly ground improvement technique compared to conventional methods in recent decades. It has been shown that bio-treatment improves the shear strength of sands remarkably, and this improvement should be predictable. To predict the shear strength after bio-treatment, different types of failure envelopes with various forms can be employed. In the majority of studies on MICP-treated sands, the shear strength parameters have been calculated based on linear failure envelopes, in spite of the fact that linear failure envelopes can overestimate the shear strength at low confinements. The intercept cohesion, indeed, may be overestimated using a linear model. Therefore, this paper presents a nonlinear failure envelope which was developed based on thirteen drained triaxial tests at two levels of cementations on Ottawa 20–30 (a clean coarse sand). The obtained results indicate that nonlinear failure envelope has a higher accuracy in predicting the shear strength of MICP-treated sands at low confinements.
Nonlinear Failure Envelope for Microbial Induced Calcium Carbonate Precipitation Treated Sand
Microbial induced calcium carbonate precipitation (MICP) has drawn significant attention as a more sustainable and eco-friendly ground improvement technique compared to conventional methods in recent decades. It has been shown that bio-treatment improves the shear strength of sands remarkably, and this improvement should be predictable. To predict the shear strength after bio-treatment, different types of failure envelopes with various forms can be employed. In the majority of studies on MICP-treated sands, the shear strength parameters have been calculated based on linear failure envelopes, in spite of the fact that linear failure envelopes can overestimate the shear strength at low confinements. The intercept cohesion, indeed, may be overestimated using a linear model. Therefore, this paper presents a nonlinear failure envelope which was developed based on thirteen drained triaxial tests at two levels of cementations on Ottawa 20–30 (a clean coarse sand). The obtained results indicate that nonlinear failure envelope has a higher accuracy in predicting the shear strength of MICP-treated sands at low confinements.
Nonlinear Failure Envelope for Microbial Induced Calcium Carbonate Precipitation Treated Sand
Nafisi, Ashkan (author) / Montoya, Brina M. (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 206-212
2019-03-21
Conference paper
Electronic Resource
English
Nonlinear Failure Envelope for Microbial Induced Calcium Carbonate Precipitation Treated Sand
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