微生物诱导碳酸钙沉淀加固根土复合体力学特性试验研究

Experimental Study on Mechanical Properties of Root-Soil Composite Reinforced by MICP.

作者信息

Zheng Xuegui, Lu Xinyu, Zhou Min, Huang Wei, Zhong Zhitao, Wu Xuheng, Zhao Baoyun

机构信息

Science and Technology Department, Chongqing Vocational Institute of Engineering, Chongqing 402260, China.

School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China.

出版信息

Materials (Basel). 2022 May 17;15(10):3586. doi: 10.3390/ma15103586.

DOI:10.3390/ma15103586

PMID:35629613

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9147924/

Abstract

Mechanical properties of undisturbed root-soil composites were investigated through direct shear tests under different cementation concentrations by microbially induced carbonate precipitation (MICP). The results show that MICP has a significant strengthening effect on the undisturbed root-soil composite, and the maximum shear strength increases by about 160% after grouting. The shear strength of root-soil composites increases with the increase in calcium chloride concentration, and the shear strength increases the most when the concentration is 0.75M. Calcium carbonate formed by MICP treatment has cementitious properties, which increases the cohesion and internal friction angle of the root-soil composite by about 400% and 120%, respectively. The results show that it is feasible to solidify slope and control soil erosion together with microbial and vegetation roots. The research results can serve as a scientific basis and reference for the application of MICP technology in vegetation slope protection engineering.

摘要

通过微生物诱导碳酸钙沉淀（MICP），在不同胶结浓度下进行直剪试验，研究原状根土复合体的力学特性。结果表明，MICP对原状根土复合体具有显著的强化作用，注浆后最大抗剪强度提高约160%。根土复合体的抗剪强度随氯化钙浓度的增加而增大，当浓度为0.75M时抗剪强度增幅最大。经MICP处理形成的碳酸钙具有胶结性能，使根土复合体的黏聚力和内摩擦角分别提高约400%和120%。结果表明，利用微生物与植物根系共同固化边坡和控制土壤侵蚀是可行的。研究成果可为MICP技术在植被边坡防护工程中的应用提供科学依据和参考。