Homogeneity and mechanical behaviors of sands improved by a temperature-controlled one-phase MICP method

Xiao, Yang; Wang, Yang; Wang, Shun; Evans, T. Matthew; Stuedlein, Armin W.; Chu, Jian; Zhao, Chang; Wu, Huanran; Liu, Hanlong

doi:10.1007/s11440-020-01122-4

Cited by 104 publications

(23 citation statements)

References 111 publications

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“…Shear strength is an important characteristic to determine the shear resistance of soils that are subjected to external loads. The shear strengths of biotreated soils were examined extensively through drained (Feng and Montoya 2016;Lin et al 2016a;Pham et al 2016Pham et al , 2018Gao et al 2019a;Liu et al 2019a;Nafisi et al 2019;Terzis and Laloui 2019a;Xiao et al 2019e;Nafisi et al 2020;Cui et al 2021a;Wu et al 2021;Xiao et al 2021d), and undrained triaxial shear tests (DeJong et al 2006;Keykha et al 2015;Montoya and DeJong 2015;Cui et al 2017;O'Donnell et al 2017b;Lam et al 2018;He et al 2020;Kashizadeh et al 2021). Montoya and DeJong (2015) demonstrated that the shear behavior of biotreated Ottawa sand varied with the biotreatment level in the undrained triaxial shearing tests.…”

Section: Compression and Shear Strength Of Biotreated Soilsmentioning

confidence: 99%

Review of Strength Improvements of Biocemented Soils

Xiao

Zaman

et al. 2022

Int. J. Geomech.

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Microbially induced calcium carbonate precipitation (MICP) has attracted great attention recently for its ability to improve the mechanical properties of soils. Calcium carbonate (CaCO 3 ) precipitates that formed at the contact points and on the surface of particles or in the pore space of soil matrixes could increase the bonding strength, friction, and interlocking resistances due to the enhancement of the interparticle bonds, particle roughness, and packing density, and therefore, greatly improve the macroscopic performances of biocemented soils that were subjected to external loading. Strength is one of the key factors when determining the application of biotreatments in geotechnical engineering during the construction and operation periods. This study presented a systematic, objective, and extensive review of the strength of biocemented soils that was based on previous research. The improvement characteristics were comprehensively investigated under compression, tension, and static and cyclic shear conditions, for unconfined compressive (UCS), splitting tensile (STS), yielding, shear, and cyclic resistance strengths. Particle scale regimes were elaborated to interpret the improvement mechanism in the biotreatment and failure modes in biocemented specimens under external loading. Furthermore, the challenges of biocementation were discussed, and future investigations were envisioned.

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Section: Compression and Shear Strength Of Biotreated Soilsmentioning

confidence: 99%

Review of Strength Improvements of Biocemented Soils

Xiao

Zaman

et al. 2022

Int. J. Geomech.

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“…One-phase 加固法、温度控制法 [78,[82][83][84][85] ，还有一些改进后可应用于实际工程，如注浆管 MICP 加固法等 [86] 。针对 MICP 加固方法的应用，目前在桩基及降雨防渗中也较为广泛 [87][88][89] 。MICP 微观机理研究也已成为当前的研究热点 [90][91][92] 。MICP 加固土体常用的细菌为巴氏芽孢杆菌，无论何种方法加固，其基本原理主要为通过尿素水解菌(如巴氏芽孢杆菌)在试样内生成铵根离子和碳酸根离子，然后再与溶液中或试样中所提供的钙离子发生化学反应，从而在试样中生成碳酸钙，进而将松散的试样进行胶结，以增强试样强度和稳定性，具体反应如下 [93][94][95] ： Weibull 模量是材料的特性参数，代表着破碎强度的离散性，Weibull 模量越大，材料的破碎强度离散性越小 [56] 。图 6 为不同类别粗粒料的 Weibull 分布图 [73][74][75] 图 7 (a)泥岩单颗粒特征强度与冻融循环次数变化曲线图 [74] ； (b)泥岩 Weibull 模量与冻融循环次数变化曲线图 [74] Fig. 7 (a) Relationship between characteristic strength of single particle and the number of freezing-thawing cycles of mudstone; (b) relationship between the Weibull modulus and the number of freezing-thawing cycles of mudstone [81] 。声发射能量可利用公式( 22)获得 [101] ： ( )…”

Section: 目前采用 Micp 加固土体的室内试验方法主要可分为循环反应法、浸泡法、Two-phase 加固法和unclassified

Recent progress on crushing-strength-energy dissipation of coarse granular soil and biocementation at contacts

Meng¹,

Xiao²,

Sun³

et al. 2022

Sci. Sin.-Tech.

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Coarse granular soil is widely used in infrastructures, such as hydropower dams, road and railways beds and airport high-fill slopes, which have high requirements of strength and deformation. Coarse granular soil has larger particle size and more scattered particle strength than other granular geomaterials. The particles of coarse granular soil are easy to break when subjected to external loading. Biocementaion, as a new promising green technology, has a potential to improve mechanical properties and alleviate particle breakage of coarse granular soil. This review introduce relevant theoretical analysis methods of particle strength of coarse granular soils first, including Weibull distribution, size effect, fractal dimension, avalanche dynamics, etc. Then, laboratory testing technique to investigate the particle strength and deformation characteristics is also introduced, e.g., single-particle crushing test, one-dimensional compression test, acoustic emission monitoring system and biocementation technology, etc. Finally, results of single-particle crushing test and one-dimensional compression test of coarse granular soil are summarized and analyzed to examine the effects of material properties, external environmental factors, particle size, and biocementation conditions on particle strength, Weibull modulus, compressibility, crushing amount, acoustic emission energy and energy dissipation, etc. This work will deepen the understanding of the particle strength and deformation characteristics of coarse granular soil and promote the application of coarse granular soil in practical engineering.

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“…However, these methods may be not suitable for the treatment of artificial calcareous sand islands which are far from the inland and with a poor construction environment. In recent years, microbially induced calcite precipitation (MICP), a new technology that utilizes biological metabolic processes to improve soil properties has been developed [8][9][10]. The fundamental chemical reactions governing the MICP process can be simply specified as follows [11,12]:…”

Section: Introductionmentioning

confidence: 99%

Dynamic Shear Modulus and Damping of MICP-treated Calcareous Sand at Low Strains

Zhang¹,

Guo²,

Chen³

et al. 2022

Preprint

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Calcareous sand deposits are widely distributed along the shoreline in ropical and subtropical regions. Microbially induced calcite precipitation treatment (MICP) is a relatively new method to improve the stiffness and strength of the soil. Little is known about the small-strain shear modulus and damping ratio of MICP-treated calcareous sand, which are two crucial parameters for the prediction of the dynamic behavior of soil. A series of resonant column tests are performed to investigate the dynamic performance of MICP-treated calcareous sand, with special attention paid to the influence of treatment duration and confining stress on the stiffness and damping characteristics. The relationship between the initial dynamic shear modulus and unconfined compressive strength is analyzed. Additionally, the empirical equations of the reference shear strain between treatment duration and confining stress are given. The G/G0 of MICP-cemented calcareous sand presents a higher strain sensitivity than that of untreated sand, and its attenuation pattern can be described by Hardin-Drnevich model. The σc has an apparent effect on the degradation characteristics of the dynamic shear modulus of MICP-treated calcareous sand with a low cementation level, however, its effect decreases with the increasing treatment duration. The relationship between the reference shear strain and the treatment duration and confining stress can be described by a power and a linear formula, respectively.

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Homogeneity and mechanical behaviors of sands improved by a temperature-controlled one-phase MICP method

Cited by 104 publications

References 111 publications

Review of Strength Improvements of Biocemented Soils

Review of Strength Improvements of Biocemented Soils

Recent progress on crushing-strength-energy dissipation of coarse granular soil and biocementation at contacts

Dynamic Shear Modulus and Damping of MICP-treated Calcareous Sand at Low Strains

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