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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2019, Vol. 53 Issue (12): 2342-2347    DOI: 10.3785/j.issn.1008-973X.2019.12.011
Civil Engineering, Hydraulic Engineering     
Impact of submarine debris flow on offshore piles
Dong-li LI1,2(),E-chuan YAN1,*(),Bin FENG3,Yuan-qiang CAI3
1. Faculty of Engineering, China University of Geosciences, Wuhan 430000, China
2. China Railway Siyuan Survey and Design Group Co. LTD, Wuhan 430000, China
3. Department of Architecture Engineering, Zhejiang University of Technology, Hangzhou 310014, China
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Abstract  

Twelve sets of experiments were carried out by changing the slope and mass fraction of kaolin. The rheological properties of debris flow were described by H-B model and power rate model; the modified Reynolds number for non-Newtonian fluids was obtained. According to the theory of fluid mechanics, the relationship between the dimensionless drag coefficient and the Reynolds number of non-Newtonian fluid was established. Results show that the debris flow viscosity varies greatly among different proportions, and the shear dilution characteristics of the debris flow can be described by power-law model or H-B model. The bending moment of pile reaches the largest at the water-soil interface. Because of the soil reaction around the pile, the bending moment of pile decreases along the buried depth. The drag coefficient decreases with the increase of the Reynolds number of non-Newtonian fluids.

Key words： submarine debris flow      impact      pile      non-Newtonian fluids      H-B model      power rate model     
Received: 26 October 2018      Published: 17 December 2019
CLC:  TU 411  
Corresponding Authors: E-chuan YAN     E-mail: 985203319@qq.com;13907199600@139.com
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Dong-li LI
E-chuan YAN
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Yuan-qiang CAI
Cite this article:

Dong-li LI,E-chuan YAN,Bin FENG,Yuan-qiang CAI. Impact of submarine debris flow on offshore piles. Journal of ZheJiang University (Engineering Science), 2019, 53(12): 2342-2347.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.12.011     OR     http://www.zjujournals.com/eng/Y2019/V53/I12/2342


海底碎屑流对海洋桩的冲击

通过改变坡度和高岭土的质量分数，进行12组模型试验. 采用H-B模型和幂率模型描述泥浆流变性质，得到适用于非牛顿流体的修正雷诺数；根据流体力学理论，建立无量纲阻力系数与非牛顿流体雷诺数之间的关系式. 结果表明：不同配比的泥浆黏度有较大的差异，采用幂率模型或H-B模型可以描述泥浆的剪切稀释特性. 桩身弯矩在水土界面处达到最大值，受到桩周土反力作用，桩身弯矩沿埋深减小；海洋桩的桩阻力系数随非牛顿流体雷诺数的增大而减小.


关键词： 海底碎屑流,  冲击,  桩基,  非牛顿流体,  H-B模型,  幂率模型 
Fig.1 Schematic diagram of submarine landslide model flume
Fig.2 Part of submarine landslide device
Fig.3 Schematic layout and instrumentation of pile test
泥浆编号 wc / % ws / % ww / % ρ /（kg·m?3）
1 15 57 28 1 729
2 20 52 28 1 745
3 25 47 28 1 766
4 30 42 28 1 776
5 35 37 28 1 791
6 40 32 28 1 804
Tab.1 Slurry composition and parameters
Fig.4 Rheological curves of slurry under different mass fractions of clay
泥浆编号 幂率模型 H-B 模型
1 ${\rm{\tau }} = 4.4{\dot \gamma ^{0.43}}$ ${\rm{\tau }} = 0.6 + 3.9{\dot \gamma ^{0.46}}$
2 ${\rm{\tau }} = 6.3{\dot \gamma ^{0.36}}$ ${\rm{\tau }} = 2.0 + 4.5{\dot \gamma ^{0.43}}$
3 ${\rm{\tau }} = 6.8{\dot \gamma ^{0.35}}$ ${\rm{\tau }} = 2.3 + 4.7{\dot \gamma ^{0.42}}$
4 ${\rm{\tau }} = 7.2{\dot \gamma ^{0.38}}$ ${\rm{\tau }} = 5.9 + 2.3{\dot \gamma ^{0.64}}$
5 ${\rm{\tau }} = 7.5{\dot \gamma ^{0.45}}$ ${\rm{\tau }} = 7.1 + 2.5{\dot \gamma ^{0.69}}$
6 ${\rm{\tau }} = 7.8{\dot \gamma ^{0.48}}$ ${\rm{\tau }} = 9.5 + 1.6{\dot \gamma ^{0.85}}$
Tab.2 Rheological model of slurry under different mass fractions of clay
Fig.5 Time history curve of pile moment
Fig.6 Measured bending moment of pile at slope of 12°
Fig.7 Bending moment of pile under landslip
α 泥浆编号 u/（m·s?1） H/cm Re q/（N·m?1） Cd
12° 1 0.54 7.1 33.8 0.003 0 0.372
2 0.58 7.6 38.2 0.003 8 0.405
3 0.62 7.2 42.3 0.004 2 0.393
4 0.50 6.8 30.4 0.003 4 0.487
5 0.44 5.6 25.9 0.002 7 0.565
6 0.52 6.9 33.2 0.003 6 0.463
8° 1 0.25 6.9 10.8 0.002 1 1.122
2 0.26 7.6 11.2 0.002 7 1.387
3 0.28 7.7 12.2 0.001 6 0.760
4 0.24 8.0 10.1 0.001 2 0.703
5 0.21 7.3 8.1 0.001 5 1.168
6 0.26 8.0 11.6 0.002 1 1.039
Tab.3 Impact force and its corresponding parameters of slurry impact on pile
Fig.8 Drag coefficient versus Reynolds number（H-B rheological models）
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