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Physical-mechanical properties of microbially induced calcite precipitation-treated loess and treatment mechanism

Journal of Mountain Science 2022年第10期19卷 2952-2967页

作者： ZHANG Hao-nan JIA Cang-qin WANG Gui-he SU Fei SUN Yong-shuai FAN Chang-yi School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China China Institute of Nuclear Industry Strategy Beijing 100822China College of Water Resources&Civil Engineering China Agricultural UniversityBeijing 100091China

Loess disintegration can lead to geotechnical engineering problems,e.g.,slope erosion,wetting-induced landslide,and *** induced calcite precipitation(MICP)technique is a potential loess reinforcing *** study investigated the physical-mechanical properties of MICP-treated loess and then explored the mechanism of loess modification by ***,loess first underwent MICP treatment,i.e.,mixing loess with Sporosarcina pasteurii and cementation solution(CS).Then,the effects of the CS concentration(0.2,0.6,0.8,and 1 M)on the physical and mechanical properties of the MICP-treated loess were ***,the static contact angle test,scanning electron microscopy(SEM),and X-ray diffractometry(XRD)were conducted to study the mechanism of MICP treatment on *** showed the following property changes of loess after MICP treatment:the liquid limit decreased by 1.7%,the average particle size increased from 6 to 47μm,the specific gravity decreased from 2.65 to 2.43,the unconfined compressive strength increased from 37 to 71 k Pa,and the disintegration time increased from 10 to 25 ***,the shear strength also increased,and the shear strength parameters(cohesion c and internal friction angle?)varied with the CS *** static contact angle tests indicated that the water absorption ability of loess was reduced after MICP *** and XRD results verified that the CaCO_(3)from MICP was attributed to the above *** above findings explained the mechanism of MICP treatment of loess:the CaCO_(3)coats and cements the particles,and fills the pores of loess,improving the strength and water stability of loess.

关键词： Microbially induced calcite precipitation Loess Physical-mechanical properties Strength improvement disintegration mitigation Modification mechanism

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