高岭土微粒固载成核微生物固化粗砂强度

马国梁; 何想; 路桦铭; 吴焕然; 刘汉龙; 楚剑; 肖杨

doi:10.11779/CJGE202102009

高岭土微粒固载成核微生物固化粗砂强度 English Version

马国梁^{1, 2,},
何想^{1, 2},
路桦铭^{1, 2},
吴焕然^{1, 2},
刘汉龙^{1, 2, 3},
楚剑⁴,
肖杨^{1, 2, 3, ,}

1.
重庆大学土木工程学院,重庆　400045
2.
重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045
3.
库区环境地质灾害防治国家地方联合工程研究中心（重庆）,重庆　400045
4.
南洋理工大学土木与环境工程学院,新加坡　639789

基金项目:

国家自然科学基金项目 51922024

中央高校基本科研业务费项目 2019CDQYTM031

重庆市研究生科研创新项目 CYB19012

详细信息

作者简介:
马国梁（1990— ）,男,博士研究生,主要从事微生物土加固机理方面的研究工作。E-mail：magl09@163.com

通讯作者:
肖杨, E-mail: hhuxyanson@163.com

中图分类号: TU43
计量
- 文章访问数: 482
- HTML全文浏览量: 34
- PDF下载量: 202
出版历程
- 收稿日期: 2020-06-24
- 网络出版日期: 2022-12-04
- 刊出日期: 2021-01-31

Strength of biocemented coarse sand with kaolin micro-particle improved nucleation

MA Guo-liang^{1, 2,},
HE Xiang^{1, 2},
LU Hua-ming^{1, 2},
WU Huan-ran^{1, 2},
LIU Han-long^{1, 2, 3},
CHU Jian⁴,
XIAO Yang^{1, 2, 3, ,}

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China
3.
National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas (Chongqing), Chongqing 400045, China
4.
School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore

摘要

摘要: 提出一种基于微粒固载成核的微生物固化技术（MICPMPIN）,用于改善微生物诱导碳酸钙沉淀（MICP）固化粗砂的力学特性,即在灌浆前给菌液中加入一定量的高岭土形成微生物固载胶体,然后将微生物固载胶体与反应液混合形成MICP浆体（MICPCS）,利用自重渗流法加固粗砂。试验结果表明新型MICPMPIN固化粗砂的强度比传统MICP固化粗砂的强度高。其他条件相同时,MICPMPIN固化粗砂的强度随高岭土掺量的增加而增加,随微生物固载胶体含量的增大而增加,且每间隔1次灌入MICPCS时固化粗砂的强度较高。高岭土本身提供的胶结强度不能使砂柱成型,可忽略不计,其作用主要是辅助成核,增加有效碳酸钙沉淀量,并减小试样孔隙比从而增强固化粗砂的效果。MICPMPIN固化粗砂的湿强度也大于传统MICP固化粗砂的湿强度,且高岭土的掺入显著增强了固化粗砂的抗软化能力。
- MICP /
- 粗砂 /
- 高岭土 /
- MICP浆体 /
- 微粒固载成核
Abstract: A new treatment, microbially induced calcium carbonate precipitation (MICP) with micro-particle improved nucleation (MICPMPIN), is introduced to improve the performance of MICP technology for the stabilization of coarse sand. A certain amount of kaolin is augmented into the bacterial suspensions to obtain immobilized bacterial slurry, then the bacterial slurry is mixed with cementation solution to form MICP-clay slurry (MICPCS) and percolated through the coarse-sand specimens under gravity. The results show that the unconfined compressive strength (UCS) of MICPMPIN-treated specimens is higher than that of MICP-treated ones. When other conditions are the same, the UCS increases with the increasing dosage of kaolin and volume ratio of immobilized bacterial slurry. The specimens with higher UCS can be obtained by grouting MICPCS every two cycles. The cementation of pure kaolin is so small that the stabilized specimen cannot be a solid. The main contribution for the higher UCS of kaolin is the nucleation that is formed by kaolin, the increment in the amount of effective precipitates, and the decrement in the amount of pore. The wet UCS of the MICPMPIN-treated specimens is larger than that of the conventional MICP treated ones, and the softening resistance is also improved by adding kaolin into the MICP process.
- MICP /
- coarse sand /
- kaolin /
- MICP-clay slurry /
- micro-particle improved nucleation

HTML全文

图 1 试验材料

Figure 1. Test materials

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图 2 制样模具

Figure 2. Moulds for preparating specimens

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图 3 MICPMPIN固化粗砂试样的无侧限抗压强度

Figure 3. UCS of MICPMPIN-treated coarse sand specimens

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图 4 碳酸钙沉淀量及沉淀效率

Figure 4. CaCO₃ contents and precipitation efficiency

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图 5 MICPMPIN固化粗砂高岭土沉淀量

Figure 5. Kaolin contents of MICPMPIN-treated specimens

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图 6 高岭土及碳酸钙沿试样高度分布（间隔1次注入MICPCS,微生物固载胶体含量1/2）

Figure 6. Distribution of kaolin and CaCO₃ along height of specimens (injecting MICPCS with 1/2 immobilized bacterial slurry every 2 times)

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图 7 MICPMPIN固化粗砂试样（间隔1次注入MICPCS,微生物固载胶体含量1/2）的微观结构及其物质组成

Figure 7. Microstructure and chemical composition of MICPMPIN-treated coarse-sand specimens (injecting MICPCS with 1/2 immobilized bacterial slurry every 2 times)

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图 8 高岭土沉淀量对无侧限抗压强度的影响

Figure 8. Effects of kaolin content on UCS

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图 9 菌液浓度对无侧限抗压强度的影响

Figure 9. Effects of bacterial density on UCS

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图 10 高岭土固化试样

Figure 10. Kaolin-stabilized specimens

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图 11 浸泡对MICPMPIN固化粗砂强度的影响

Figure 11. Effects of immersion on UCS of MICPMPIN-stabilized coarse sand

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表 1 MICPCS参数

Table 1 Parameters of MICP-clay slurry

微生物固载胶体含量微生物固载胶体体积/mL 反应液体积/mL 反应液浓度/(mol·L^-1) MICP浆体浓度/(mol·L^-1)

1/2 25.0 25.0 2.00 1.00
1/4 12.5 37.5 1.34 1.00
1/10 5.0 45.0 1.11 1.00

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表 2 MICPMPIN加固粗砂试验设计

Table 2 Test design for stabilizing coarse sand by MICPMPIN

间隔次数高岭土质量浓度/(g·L^-1)
0 10 20 40 100

0 √ √ √ — —
1 √ √ √ √ √
3 √ — √ — √

下载: 导出CSV

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