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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2022, Vol. 56 Issue (10): 2057-2065    DOI: 10.3785/j.issn.1008-973X.2022.10.017
    
Analysis of dynamic filter cake permeability characteristics of slurry shield based on modified fluid loss test
Gang WEI1,2,3(),Yan-hua ZHU4,Xin-sheng YIN1,2,3(),Zhi DING1,2,3,Yun-liang CUI1,2,3
1. College of Engineering, Zhejiang University City College, Hangzhou 310015, China
2. Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou 310015, China
3. Zhejiang Engineering Research Center of Intelligent Urban Infrastructure, Hangzhou 310015, China
4. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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Abstract  

The modified fluid loss test was conducted to analyze the hydraulic conductivity of dynamic filter cake of slurry shield in order to analyze the influence of filter cake on the stability of the tunnel face of slurry shield. The calculation method of slurry density in slurry warehouse was proposed. The relationship curve between time and fluid loss, and the filter cake constitutive parameters (relationship between void rate, hydraulic conductivity and pressure) were obtained. The equation for average thickness of dynamic filter cake was derived. The decrease of filter cake pore ratio caused by the increase of test pressure can reduce the hydraulic conductivity. CMC-Na is the most effective in modifying slurry. The thickness of filter cake formed by adding polymer material is smaller, and there is a positive relationship between the thickness and the average hydraulic conductivity. The thickness of the filter cake will periodically change during shield excavation, and the cycle time of the dynamic filter cake depends on the tool layout and the rotational speed of the cutter. The average thickness of the dynamic filter cake is about 2/3 of the maximum filter cake thickness.

Key words： slurry shield      slurry property      filter cake      fluid loss      hydraulic conductivity     
Received: 14 October 2021      Published: 25 October 2022
CLC:  U 455  
Fund:  国家自然科学基金资助项目（52178399，52278418）；国家自然科学基金青年科学基金资助项目(51808493)；浙江省教育厅科研计划资助项目(Y201839147)；浙江省自然科学基金资助项目(LY21E080004)；杭州市科技局规划资助项目(2020ZDSJ0639）
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Gang WEI
Yan-hua ZHU
Xin-sheng YIN
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Yun-liang CUI
Cite this article:

Gang WEI,Yan-hua ZHU,Xin-sheng YIN,Zhi DING,Yun-liang CUI. Analysis of dynamic filter cake permeability characteristics of slurry shield based on modified fluid loss test. Journal of ZheJiang University (Engineering Science), 2022, 56(10): 2057-2065.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.10.017     OR     https://www.zjujournals.com/eng/Y2022/V56/I10/2057


基于改进滤失试验的泥水盾构动态泥膜渗透特性研究

为了研究泥膜对泥水盾构开挖面稳定性的影响，通过改进滤失试验研究泥水盾构动态泥膜的渗透特性，提出泥水舱泥浆密度的计算方法，获得时间与泥浆滤失量的关系曲线和泥膜的本构参数（孔隙比-渗透系数-压力的相互关系），推导动态泥膜平均厚度的计算公式. 由试验压力增长引起的泥膜孔隙比的减小，可以降低泥膜的渗透系数. CMC-Na对泥浆的改性效果最好. 添加高分子材料的泥浆形成的泥膜厚度变小，泥膜厚度与泥膜平均渗透系数存在正比关系. 在盾构掘进过程中，泥膜厚度会发生周期性变化，动态泥膜的周期时间取决于刀具的布局和刀盘的转速. 动态泥膜的平均厚度约为最大泥膜厚度的2/3.


关键词： 泥水盾构,  泥浆性质,  泥膜,  滤失量,  渗透系数 
Fig.1 Schematic of slurry shield construction
Fig.2 Fluid loss test device
参数 数值 参数 数值
wf/% 100 WP/% 72.6
wc/% 83.2 Ip 170.2
dr 2.55 S/(mL·(2g)?1) 12.0
WL/% 242.8 pH 7
Tab.1 Basic characteristic index of bentonites
泥浆型号 mb/g 材料 Mr/103 (mmmw?1)/% μs/s vm/s ρ/(g·cm?3) τy/Pa μ/(mPa·s) S/(mL·(2g)?1) d85/mm
SL1 50 — — 0 16 30 1.03 0.15 1.50 12.0 0.033150
SL2 70 — — 0 17 31 1.035 0.16 1.90 12.0 0.030580
SL3 50 APAM 25000 1 253 472 1.03 8.94 33.65 18.9 0.047820
SL4 50 CPAM 16000 1 19 38 1.03 0.10 5.80 15.9 0.135110
SL5 50 PAA-Na 1.2 1 19 34 1.03 0.51 3.40 16.6 0.069890
SL6 50 PAA-Na 15 1 22 40 1.03 1.28 6.05 18.3 0.066940
SL7 50 CMC 41 1 23 41 1.03 2.20 9.15 15.2 0.059670
SL8 50 CMC 57 1 264 291 1.03 32.04 63.35 17.3 0.050940
SL9 50 CMC-Na 8 1 31 51 1.03 2.96 19.40 15.3 0.063560
SL10 50 PAA-Na 1.2 2 20 36 1.03 0.87 5.95 17.3 0.044890
SL11 50 PAA-Na 15 2 23 38 1.03 3.12 6.45 19.1 0.087200
SL12 50 CMC 41 2 29 51 1.03 3.73 7.75 15.9 0.049960
SL13 50 CMC-Na 8 2 114 163 1.03 19.21 56.50 16.0 0.070220
SL14 50 QT — 13.7 17 31 1.10 0.2 3.50 12.9 0.043574
SL15 50 QT — 13.7 49 114 1.10 8.64 34.95 16.5 0.077433
SL15 50 CMC-Na 8 1 49 114 1.10 8.64 34.95 16.5 0.077433
Tab.2 Basic properties of slurry
Fig.3 Grading curve of slurry particles
Fig.4 Fluid loss test results
Fig.5 Relationship between ∆pt/V and V
Fig.6 Relationship between ∆pt/V2 and ∆p
Fig.7 Relationship between slurry pressure and filter cake average pore ratio
Fig.8 Relationship between slurry pressure and filter cake average hydraulic conductivity
泥浆型号 α k0/(m·s?1) δ e0
SL1 0.845 3.41×10?7 0.0754 3.763 6
SL2 0.909 3.97×10?7 0.0980 4.202 4
SL3 0.674 4.35×10?10 0.3509 26.308 7
SL4 0.405 4.93×10?9 0.1529 7.490 3
SL5 0.517 2.86×10?9 0.2836 9.230 0
SL6 0.682 3.70×10?9 0.0714 6.064 6
SL7 0.739 3.08×10?10 0.1362 9.963 2
SL8 0.376 3.25×10?11 0.2705 16.908 3
SL9 0.349 9.18×10?12 0.1181 6.736 0
SL10 0.676 1.92×10?9 0.1954 10.418 4
SL11 0.925 7.95×10?10 0.0861 8.824 7
SL12 0.712 2.33×10?10 0.0838 12.075 4
SL13 0.152 3.30×10?12 0.1097 8.454 7
SL14 0.825 3.23×10?7 0.1739 0.828 7
SL15 0.193 2.52×10?12 0.1199 2.217 2
Tab.3 Parameter of pore-hydraulic conductivity-pressure of filter cake
Fig.9 Average hydraulic conductivity of filter cake at 20 kPa
Fig.10 Relationship between average hydraulic conductivity of filter cake and swelling index
Fig.11 Schematic diagram of cutterhead cutting soil
Fig.12 Relationship between average pore ratio and thickness of filter cake
Fig.13 Variation of filter cake thickness with time at∆p = 20 kPa
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