micp处理土的工程特性研究进展

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Tong Yu, H. Souli, Y. Péchaud, J. Fleureau
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引用次数: 9

摘要

微生物诱导碳酸钙沉淀(MICP)是一种可持续有效的土壤改良方法,近年来得到了迅速发展。它是一种生物介导的方法,利用细菌的代谢过程,使CaCO3在土壤的孔隙空间中沉淀。该技术在岩土工程领域具有很大的潜力,可以改善土壤的性质,包括减轻液化、控制渗透等。从微观结构研究(微米尺度的显微成像和相关上升技术)到宏观测试(实验室物理、化学和机械测试,从厘米到米),再到现场试验(公里),已经进行了多尺度的研究,以研究MICP的机制和效率。本文对近年来各种试验方法(常规试验包括无侧限压缩试验、三轴试验和测径试验、离心机试验、横波速度和渗透率测量以及显微成像)所获得的结果进行了选择、介绍、分析和总结,以期为今后的研究提供参考。虽然各研究结果比较分散,但由于实验条件不同,可以得出一个普遍的结论:当CaCO3含量(CCC)增加时,无侧限抗压强度增加(CCC =5%时可达1.4 MPa),剪切波速增加(CaCO3每沉淀1%,V_s增加1倍以上),渗透率下降(下降幅度限制在3个数量级以内)。在力学行为方面,MICP处理后的土的峰值特性增加,摩擦角无限大增加,黏聚力大幅增加。在循环/动荷载作用下,土体产生的孔隙压力减小,应变减小,达到液化的循环次数增加。值得注意的是,CaCO3的形成导致了样品干密度的增加,这增加了颗粒的结合,并可能在改善土壤的力学性能,如峰值最大偏差,抗液化等方面发挥重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Review on engineering properties of MICP-treated soils
Microbial induced calcium carbonate precipitation (MICP), a sustainable and effective soil improvement method, has experienced a burgeoning development in recent years. It is a bio-mediated method that uses the metabolic process of bacteria to cause CaCO3 precipitation in the pore space of the soil. This technique has a large potential in the geotechnical engineering field to enhance soil properties, including mitigation of liquefaction, control of suffusion, etc. Multi-scale studies, from microstructure investigations (microscopic imaging and related rising techniques at micron-scale), to macroscopic tests (lab-based physical, chemical and mechanical tests from centimeter to meter), to in-situ trials (kilometers), have been done to study the mechanisms and efficiency of MICP. In this article, results obtained in recent years from various testing methods (conventional tests including unconfined compression tests, triaxial and oedometric tests, centrifuge tests, shear wave velocity and permeability measurements, as well as microscopic imaging) were selected, presented, analyzed and summarized, in order to be used as reference for future studies. Though results obtained in various studies are rather scattered, owning to the different experimental conditions, general conclusions can be given: when the CaCO3 content (CCC) increases, the unconfined compression strength increases (up to 1.4 MPa for CCC=5%) as well as the shear wave velocity (more than 1-fold increase in V_s for each 1% CaCO3 precipitated), and the permeability decreases (with a drop limited to less than 3 orders of magnitude). Concerning the mechanical behavior of MICP treated soil, an increase in the peak properties, an indefinite increase in friction angle and a large increase in cohesion were obtained. When the soil was subjected to cyclic/dynamic loadings, lower pore pressure generation, reduced strains, and increasing number of cycles to reach liquefaction were concluded. It is important to note that the formation of CaCO3 results in an increase in the dry density of the samples, which adds to the bonding of particles and may play a major part in the improvement of the mechanical properties of soil, such as peak maximum deviator, resistance to liquefaction, etc.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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