泥水盾构抗海水劣化泥浆流变性能及成膜机制分析

丁万涛; 郭文静; 曹凯; 李振宇

doi:10.11779/CJGE20230904

泥水盾构抗海水劣化泥浆流变性能及成膜机制分析 English Version

丁万涛^{1, 2,},
郭文静¹,
曹凯¹,
李振宇³

1.
山东大学齐鲁交通学院, 山东济南 250002
2.
山东大学岩土与地下工程研究院, 山东济南 250061
3.
哈尔滨地铁集团有限公司, 黑龙江哈尔滨 150080

基金项目:

国家自然科学基金面上项目 52278403

山东省自然科学基金项目 ZR2021ME135

详细信息

作者简介:
丁万涛(1975—)，男，博士，教授，主要从事盾构隧道稳定性等方面的研究工作。E-mail: dingwantao@sdu.edu.cn

中图分类号: TU411
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出版历程
- 收稿日期: 2023-09-14
- 网络出版日期: 2024-04-17
- 刊出日期: 2024-11-30

Rheological properties and film-forming mechanism of anti-seawater deterioration slurry for slurry shield

1.
School of Qilu Transportation, Shandong University, Jinan 250002, China
2.
Institute of Geotechnical and Underground Engineering, Shandong University, Jinan 250061, China
3.
Harbin Metro Group Corporation Limited, Harbin 150080, China

摘要

摘要: 近海或越海泥水盾构隧道建设中，泥浆接触海水后性质劣化难以形成泥膜，极易引起开挖面失稳。提出一种使用亚麻籽胶作为外加剂的抗海水劣化泥浆，基于自主研发的变截面渗透柱研究了亚麻籽胶含量和海水侵入度对累积滤水量及超静孔隙水压力（超静孔压）的影响；获取了泥浆累积粒径分布曲线及流变性质，分析了抗海水劣化泥浆的渗透成膜机制。结果表明，亚麻籽胶能够提高降滤失效果、加快超静孔压消散，促进泥膜形成。随海水侵入度增大，滤水量先减小后增加，泥浆d₈₅先变大后减小，流变性质则逐渐变差。侵入度≤30%时泥浆能够抵抗海水劣化，颗粒堵塞作用是致密泥膜形成的关键；侵入度较高（50%，70%）时泥膜渗透性变差，颗粒堵塞及流变阻塞耦合作用可能是抑制泥浆持续向地层渗透的原因；侵入度为100%时泥浆性质严重劣化，无法形成泥膜。研究成果可为海水环境下泥水盾构施工抗海水劣化泥浆的研发提供可行思路。
- 海底泥水盾构 /
- 抗海水劣化泥浆 /
- 渗透柱试验 /
- 颗粒堵塞 /
- 流变阻塞
Abstract: During the construction of offshore and seabed slurry shield tunnels, the properties of slurry contacting with seawater are seriously deteriorated, leading to the failure of filter cake formation and the instability of excavation face. In this study, an anti-seawater deterioration slurry using flaxseed gum as an admixture is proposed. Based on the self-developed variable cross-section infiltration column, the effects of the flaxseed gum content and seawater intrusion degree on the cumulative water filtration and excess pore water pressure are studied, respectively. The cumulative particle size distribution and rheological properties of slurry under different seawater concentrations are obtained. The mechanism of infiltration and filter cake formation of anti-seawater deterioration slurry is analyzed. The results show that the flaxseed gum can improve the effects of fluid loss reduction, accelerate the dissipation of the excess pore pressure, and promote the formation of mud film. With the increase of the seawater intrusion, the fluid loss decreases first and then increases, the d₈₅ of slurry increases first and then decreases, and the rheological properties are gradually deteriorated. When the intrusion degree is less than 30%, the slurry can resist the seawater deterioration, and the particle clogging is the key to the formation of dense filter cake. After the intrusion degree reacheds 50%, the filter cake permeability becomes worse. The coupling effects of the particle clogging and rheological blocking may be the reason for inhibiting the continuous penetration of the slurry into the formation. When the intrusion degree is 100%, the slurry properties are deteriorated seriously, and the filter cake cannot be formed. The research can provide feasible ideas for the research and development on seawater-resistant slurry during the construction of slurry shields under seawater environment.
- seabed slurry shield /
- anti-seawater deterioration slurry /
- infiltration column test /
- particle clogging /
- rheological blocking

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图 1 变截面渗透试验系统

Figure 1. Variable cross-section penetration test devices

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图 2 累积滤水量变化曲线

Figure 2. Change curves of cumulative water filtration

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图 3 试验过程中收集的滤水

Figure 3. Water filtration collected during tests

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图 4 超静孔压随时间变化曲线

Figure 4. Change of excess pore water pressure with time

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图 5 累积滤水量变化曲线

Figure 5. Change curves of cumulative water filtration

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图 6 试验过程中收集的滤水

Figure 6. Water filtration collected during tests

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图 7 超静孔压随时间变化曲线

Figure 7. Change of excess pore water pressure with time

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图 8 海水侵入度对累计粒径分布曲线的影响

Figure 8. Effects of seawater intrusion on distribution curve of cumulative particle size

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图 9 海水侵入度对流变性质的影响

Figure 9. Effects of seawater intrusion on rheological properties

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图 10 渗透成膜机理

Figure 10. Mechanism of slurry penetration and filter cake formation

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表 1 各组泥浆成分Table 1 Slurry composition of each group 单位：%

钠基膨润土	组别	编号	亚麻籽胶	$\frac{海水}{水}$
14	无海水侵入	F0	0	0
		F1	0.1
		F15 (S0)	0.15
	海水侵入	S1	0.15	10
		S2		20
		S3		30
		S5		50
		S7		70
		S10		100

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表 2 试验地层物理参数

Table 2 Physical parameters of test strata

物理参数	地层材料	粒径范围	孔隙率	干密度	渗透系数	地层平均孔径
取值	砂	0.63~1.25 mm	0.40	1.59 g/cm³	4.8×10^-4 m/s	51 μm
注：砂经105℃烘干24 h后使用，渗透系数由常水头试验测得。

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表 3 泥浆漏斗黏度

Table 3 Funnel viscosities of slurry

组号	海水侵入度/%	漏斗黏度/s
S0	0	38.1
S1	10	30.8
S2	20	25.4
S3	30	22.8
S5	50	16.1
S7	70	14.5
S10	100	13.9

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表 4 泥浆性质与渗透试验结果之间的关系

Table 4 Relationship between slurry properties and infiltration test results

组号	海水浓度/%	渗透类型	累积滤水量/g	d₈₅/μm	流变方程	表观黏度/(mPa·s)	漏斗黏度/s
S0	0	Ⅰ	90	221.40	τ=15.94+1.18γ^0.56	74.9	38.1
S1	10	Ⅰ	0	256.80	τ=9.19+0.57γ^0.58	42.5	30.8
S2	20	Ⅰ	50	240.70	τ=5.56+0.08γ^0.79	24.6	25.4
S3	30	Ⅰ	157	130.30	τ=2.13+0.07γ^0.82	21.5	22.8
S5	50	Ⅱ	881	59.00	τ=1.45+0.02γ^0.95	17.6	16.1
S7	70	Ⅱ	1300	54.13	τ=1.43+0.02γ^0.96	17.2	14.5
S10	100	Ⅲ	2010	52.90	τ=1.41+0.02γ^0.96	16.8	13.9
注：表观黏度取剪切速率为1000 s^-1时的表观黏度。

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