羟乙基纤维素联合脲酶诱导碳酸盐沉淀固化粉砂的水稳定性

原华; 孙放; 李瑾; 刘帅星; 王凯

羟乙基纤维素联合脲酶诱导碳酸盐沉淀固化粉砂的水稳定性

原华¹,
孙放¹,
李瑾¹,
刘帅星²,
王凯^1, ,

1.
河南大学　建筑工程学院, 河南开封 475004
2.
郑州宝冶钢结构有限公司, 河南郑州 450000

基金项目: 国家自然科学基金面上项目(42177454)；河南省2022年本科高校研究性教学改革研究与实践项目(2022SYJXLX010)

详细信息

通讯作者:
王凯，博士，讲师，硕士生导师，研究方向为采动岩石力学，注浆支护　E-mail: kwang@henu.edu.cn

中图分类号: TB331
计量
- 文章访问数: 24
- HTML全文浏览量: 16
- 被引次数: 0
出版历程
- 收稿日期: 2024-06-14
- 修回日期: 2024-08-07
- 录用日期: 2024-08-15
- 网络出版日期: 2024-08-31

Water Stability of Silty Sand Solidified by Enzyme-induced Carbonate Precipitation Combined with Hydroxyethyl Cellulose

1.
School of Civil Engineering and Architecture, Henan University, Kaifeng, Henan 475004, China
2.
Zhengzhou Baoye Steel Structure Co Ltd, Zhengzhou 450000, Henan, China

Funds: National Natural Science Foundation of China (42177454); Research and Practice Program on Research Teaching Reform in Undergraduate Colleges and Universities in Henan Province in 2022 (2022SYJXLX010)

摘要

摘要: 为提高脲酶诱导碳酸盐沉淀(EICP)固化地基土的效果，本研究提出羟乙基纤维素(HEC)联合EICP固化粉砂的技术，并分析了该技术固化粉砂的水稳定性。以表面强度和水稳定性为考察指标(水稳定性通过崩解率与浸水强度损失率评估)，进行四因素(HEC浓度、喷洒量、喷洒遍数、钙源浓度)四水平正交试验，通过微型贯入、崩解率测定、浸水强度损失率测定试验以及微观试验，从宏微观角度分析其固化机制。结果表明：对于不同考察指标，HEC浓度在各因素影响的主次顺序中均为第一位；HEC联合EICP固化粉砂的最佳固化参数组合为：HEC浓度为0.6 g/L、喷洒量为3 L/m²、喷洒遍数为4遍、钙源浓度为0.75 mol/L，此时固化粉砂的表面强度较传统EICP提高了57.47%、崩解率和浸水强度损失率较传统EICP分别降低了78.64%和83.75%；HEC的掺入改变了EICP单一的胶结模式，在土颗粒间产生“包裹”、“连接”效应，形成土颗粒-HEC-CaCO₃的链式网状结构，提高了粉砂的表面强度和水稳定性。
- 酶诱导碳酸盐沉淀 /
- 羟乙基纤维素 /
- 正交试验 /
- 表面强度 /
- 水稳定性
Abstract: In order to improve the effect of enzyme induced carbonate precipitation (EICP) in solidifying subground soil, this study proposed a technique of hydroxyethyl cellulose (HEC) combined with EICP to solidify silty sand, and analyzed the water stability of treated silty sand. The surface strength and water stability were taken as the investigation indexes (water stability was evaluated by disintegration rate and strength loss rate after immersion). Four factors (HEC concentration, spraying amount, spraying times, calcium source concentration) and four levels orthogonal test were carried out. The solidified mechanism was analyzed from the perspective of macro and micro through micro penetration test, disintegration rate determination test, strength loss rate after immersion determination test and micro experiments.The results showed that fro different evaluation indicators, HEC concentration ranked first in the primary and secondary order of each factor’s influence. The optimal solidification parameter for HEC combined with EICP to solidify silty sand is HEC concentration of 0.6 g/L, spraying amount of 3 L/m², spraying frequency of 4, and calcium source concentration of 0.75 mol/L. At this time, the surface strength of solidified silty sand is increased by 57.47% compared to that of traditional EICP, and the disintegration rate and strength loss rate after immersion are 78.64% and 83.75% lower than those of traditional EICP, respectively. The incorporation of HEC changed the single cementation mode of EICP, generating "wrapping" and "connection" effects between soil particles, forming a chain network structure of soil particles-HEC-CaCO₃, which improves the surface strength and water stability of silty sand.
- Enzyme induced carbonate precipitation /
- hydroxyethyl cellulose /
- orthogonal test /
- surface strength /
- water stability

HTML全文

图 1 黄泛区粉砂的粒径级配及基本物理参数

Figure 1. Particle size grade and basic physical parameters of silty sand in Yellow River flooding area

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图 2 试验流程

Figure 2. Test process

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图 3 不同测试方案下土样的指标数据

Figure 3. Index data of soil samples under different testing schemes

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图 4 针对表面强度的极差分析

Figure 4. Range analysis for surface strength

HC—HEC concentration; SA—Spray amount; SF—spray frequency; CSC—Calcium source concentration.

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图 5 针对崩解率的极差分析

Figure 5. Range analysis for disintegration rate

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图 6 针对浸水强度损失率的极差分析

Figure 6. Range analysis of strength loss rate after immersion

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图 7 不同方式处理后试样的特性指标

Figure 7. Characteristic indicators of samples treated with different methods

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图 8 不同方式固化试样的SEM图像

Figure 8. SEM images of specimens solidified by different methods

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图 9 不同方式固化试样的EDS图像

Figure 9. EDS images of specimens solidified by different methods

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图 10 不同方式处理土样的XRD图谱

Figure 10. XRD patterns of soil treated with different methods

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图 11 HEC联合EICP固化粉砂的机制

Figure 11. Mechanism of solidifying silty sand by HEC combined with EICP

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表 1 正交试验因素水平表

Table 1. Orthogonal experimental factor level table

Level	Factor
Level	HEC concentration/ (g·L⁻¹)	Spray amount/ (L·m⁻²)	Spray frequency	Calcium source concentration/ (mol·L⁻¹)
1	0.2	1	1	0.25
2	0.4	2	2	0.5
3	0.6	3	3	0.75
4	0.8	4	4	1

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表 2 四因素正交试验方案

Table 2. Four factor orthogonal experimental scheme

Test Number	Factor
Test Number	HEC concentration/ (g·L⁻¹)	Spray amount/ (L·m⁻²)	Spray frequency	Calcium source concentration/ (mol·L⁻¹)
1	0.2	1	1	0.25
2	0.2	2	2	0.5
3	0.2	3	3	0.75
4	0.2	4	4	1
5	0.4	1	2	0.75
6	0.4	2	1	1
7	0.4	3	4	0.25
8	0.4	4	3	0.5
9	0.6	1	3	1
10	0.6	2	4	0.75
11	0.6	3	1	0.5
12	0.6	4	2	0.25
13	0.8	1	4	0.5
14	0.8	2	3	0.25
15	0.8	3	2	1
16	0.8	4	1	0.75

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表 3 针对表面强度的方差分析

Table 3. Variance analysis for surface strength

Source of variance	S_v	d	S	F	P/(×10⁻²)
HC	24.73	3	8.24	213.33	0.05
SA	1.58	3	0.53	13.59	2.98
SF	1.29	3	0.43	11.08	3.94
CSC	0.49	3	0.16	4.18	13.53
Error	0.17	3	0.04	1.00	50.00
Notes: S_v—Sum of squares of deviations; d—degree of freedom; S—Square deviation; F—F-statistic; P—P-value.

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表 4 针对崩解率的方差分析

Table 4. Variance analysis for disintegration rate

Source of variance	S_v	d	S	F	P/(×10⁻²)
HC	80.98	3	26.99	223.24	0.05
SA	8.91	3	2.97	24.55	1.30
SF	10.70	3	3.57	29.49	1.00
CSC	3.65	3	1.22	10.07	4.48
Error	0.36	3	0.12	1.00	50.00

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表 5 针对浸水强度损失率的方差分析

Table 5. Variance analysis for strength loss rate after immersion

Source of variance	S_v	d	S	F	P/(×10⁻²)
HC	7.49	3	2.50	86.55	0.21
SA	1.43	3	0.48	16.49	2.28
SF	1.67	3	0.56	19.22	1.84
CSC	0.84	3	0.28	9.69	4.72
Error	0.09	3	0.03	1.00	50.00

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