冻融循环对 MICP 加固土性能的影响

李俊; 张伟丽; 陈宗武; 李明依

doi:10.19509/j.cnki.dzkq.tb20230462

冻融循环对 MICP 加固土性能的影响

doi: 10.19509/j.cnki.dzkq.tb20230462

李俊^1,,
张伟丽^1, ,,
陈宗武^{1, 2},
李明依¹

1.
中国地质大学（武汉）工程学院，武汉 430074
2.
中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室，北京 100024

基金项目: 国家自然科学基金项目（51808517）；绿色建筑材料国家重点实验室开放基金项目（2021GBM03）；中国地质大学（武汉）教学实验室开放基金项目（SKJ2022073）

详细信息

作者简介:
李俊：E-mail：LiJun306@cug.edu.cn

通讯作者:
E-mail：zwl@cug.edu.cn

中图分类号: TU472.99
计量
- 文章访问数: 293
- PDF下载量: 33
- 被引次数: 0
出版历程
- 收稿日期: 2023-08-11
- 录用日期: 2023-12-14
- 修回日期: 2023-12-13
- 网络出版日期: 2023-12-18

Effect of freeze-thaw cycles on the properties of MICP-treated soil

LI Jun^1
,,
ZHANG Weili^{1
, ,},
CHEN Zongwu^{1, 2},
LI Mingyi¹

1.
Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China
2.
State Key Laboratory of Green Building Materials, China General Research Institute of Building Materials Science Co., Beijing 100024, China

More Information

Author Bio:
E-mail：LiJun306@cug.edu.cn

Corresponding author: E-mail：zwl@cug.edu.cn

摘要

摘要:
近年来微生物诱导碳酸钙沉积技术（MICP）备受关注，在土体加固领域也取得了一定进展。微生物加固后土体性能整体得到提升，但是冬冻春融的循环作用，使得土体结构逐渐松散，导致土体强度、抗冲刷性和保水能力均有所降低。目前针对冻融循环对MICP固化土性能影响研究较少。采用喷洒法对试样表面进行了MICP固化处理，对多组试样给予不同冻融周期作用，并进行了无侧限抗压强度测试、冲刷试验和水分蒸发试验，探讨了试样水分蒸发速率随冻融周期增加的变化规律，以及冻融对加固土性能的影响。基于土体抵抗冲刷破坏作用机理，结合不同冻融周期下试样的表观松散程度和试验结果，探究了冻融循环导致加固土性能下降的原因。试验结果表明：试样无侧限抗压强度（UCS值）从43.83 kPa提高到加固后的69.92 kPa，经历20次冻融循环，加固试样的UCS值为未加固试样1.48倍，且加固试样冲刷侵蚀量远小于未加固试样的一半。研究表明微生物诱导生成的碳酸钙沉积物能够有效填充土体内部孔隙，黏结松散土颗粒，从而大幅提高土体强度，有效削弱冻融对土体的破坏作用。虽然冻融循环作用周期增加使得土体的加固效果逐渐劣化，但在短期冻融环境下，MICP加固后土体仍具有较高的强度，并能有效抵抗雨水的冲刷侵蚀作用。
- 微生物诱导碳酸钙沉积（MICP） /
- 微生物加固土 /
- 冻融循环 /
- 雨水冲刷
Abstract: Objective
The microbial induced carbonate precipitation (MICP) technology has received widespread attention from the academic community and has also made certain progress in the field of soil reinforcement. After MICP, the overall performance of the soil is improved, but the cyclic effect of winter freezing and spring thawing gradually loosens the soil structure, resulting in a decrease in soil strength, erosion resistance, and water retention capacity. Currently, there is limited research on the impact of freeze-thaw cycles on the properties of MICP stabilized soil.
Methods
This study investigated the effects of freeze-thaw cycles on the unconfined compressive strength (UCS), erosion resistance, and water retention capacity of soil treated with MICP under different conditions. The surfaces of the samples were treated via the spray method, and then, some samples were subjected to erosion tests. The UCS and water evaporation rate of the samples under different numbers of freeze-thaw cycles were tested. Combining the mechanism of soil resistance to erosion damage and the test results of samples subjected to freeze-thaw cycles, the reasons for the deterioration of reinforced soil properties due to freeze-thaw cycles were investigated.
Results
The results revealed that the UCS of the sample increased from 43.83 kPa to 69.92 kPa after MICP treatment. After 20 freeze-thaw cycles, the UCS value of the MICP-treated sample was 1.48 times greater than that of the uncured sample, and the erosion amount of the MICP-treated sample was much less than half of that of the uncured sample. Research has shown that microbial induced calcium carbonate deposits can effectively fill the internal pores of the soil and bind loose soil particles, significantly improving the soil strength and effectively weakening the destructive effect of freeze-thaw cycles on the soil.
Conclusion
Although the reinforcement effect of the soil gradually deteriorated due to the increase in the number of freeze-thaw cycles, the MICP-treated soil still had high strength in a short-term freeze-thaw environment and could effectively resist the erosion effect of rainwater.
- microbial induced carbonate precipitation (MICP) /
- soil biocementation /
- freeze-thaw cycle /
- rainfall erosion

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图 1 试样照片

Figure 1. Photograph of a sample

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图 2 冲刷装置示意图

Figure 2. Schematic diagram of the eroding device

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图 3 C组试样碳酸钙质量分数分布图

Figure 3. Distribution of the calcium carbonate content of C sample

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图 4 A组（a～e）和B组（f～j）试样表观随冻融周期变化对比

Figure 4. Comparison of the changes in surface of the samples A (a-e) and B (f-j) with increasing number of freeze-thaw cycles

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图 5 无侧限抗压强度（UCS）随冻融周期变化曲线

Figure 5. Variation curve of the unconfined compressive strength with increasing number of freeze-thaw cycles

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图 6 试样水分累计蒸发量曲线图

Figure 6. Cumulative evaporation curve of the sample moisture

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图 7 冲刷侵蚀量

Figure 7. Erosion quality

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图 8 冲刷后试样的表观图像

Figure 8. Surface image of specimens after erosion

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图 9 试样内部碳酸钙分布示意图

Figure 9. Schematic diagram of the calcium carbonate distribution within the sample

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图 10 土体冻融破坏示意图

Figure 10. Schematic diagram of freeze-thaw damage to soil

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图 11 冲刷状态下土颗粒受力分析

G. 土颗粒自身重力；F. 水流推动力；C. 土颗粒间的黏结力；N. 下部土层的作用力；f. 来自其他颗粒的阻力

Figure 11. Force analysis of the soil particles under eroding conditions

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表 1 试验用土物理性质

Table 1. Physical properties of the test soil

液限 ω_L/%	塑限 ω_P/%	天然含水量w/%	塑性指数 $ {I}_{{\mathrm{P}}} $	相对密度 $ {d}_{{\mathrm{s}}} $
45.3	28.5	16.8	16.8	2.65

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表 2 试样信息

Table 2. Specimen information

试样规格		编号	是否MICP处理	冻融周期/次	数量
冲刷试样（9 cm×9 cm×1.8 cm）	A组	A00	是	0	1
		A05		5	1
		A10		10	1
		A15		15	1
		A20		20	1
	B组	B00	否	0	1
		B05		5	1
		B10		10	1
		B15		15	1
		B20		20	1
无侧限抗压试样（直径36 mm，高80 mm）	C组	C00	是	0	3
		C05		5	3
		C10		10	3
		C15		15	3
		C20		20	3
	D组	D00	否	0	3
		D05		5	3
		D10		10	3
		D15		15	3
		D20		20	3

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表 3 菌液和胶结液用量

Table 3. Amounts of bacterial solution and cement solution

试样名称	注入液	单次注入量/mL	注入次数
无侧限抗压试样	菌液	40	1
无侧限抗压试样	胶结液	40	5
冲刷试样	菌液	74	1
冲刷试样	胶结液	74	5

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