Journal of Shandong University(Engineering Science) ›› 2023, Vol. 53 ›› Issue (3): 60-68.doi: 10.6040/j.issn.1672-3961.0.2021.598

• Civil Engineering • Previous Articles     Next Articles

Seepage characteristics of soil-structure contact under confining pressure

Jian LIU1(),Hao YANG2,Xiaolin CUI3   

  1. 1. School of Qilu Transportation, Shandong University, Jinan 250061, Shandong, China
    2. School of Civil Engineering, Shandong University, Jinan 250002, Shandong, China
    3. Yellow River Shandong Bureau of Yellow River Conservancy Commission of the Ministry of Water Resources, Jinan 250011, Shandong, China
  • Received:2021-12-07 Online:2023-06-20 Published:2023-07-07

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Abstract:

To study the problem of particle loss in the process of contact seepage between soil-structure, a contact seepage failure test device under the combined action of seepage and pressure was designed. The effects of clay mass fraction, confining pressure and roughness of contact surface on particle erosion process under this condition were studied by experimental research. Under the combined action of seepage and pressure, three-stage phenomenon of particle erosion in contact seepage were appeared, which was seepage stability stage, particle migration stage and particle erosion stage respectively. The influence parameters of roughness, clay mass fraction and confining pressure on the particle erosion conditions of soil-structure interface were analyzed by multifactor analysis of variance. Considering the 95% confidence interval, the degree of influence, from large to small, was as follows: clay mass fraction, confining pressure, roughness. After fitting the formula by Quasi-Newton method, the formula of hydraulic conditions of particle erosion was put forward. The results could provide data support for infrastructure design with contact surface.

Key words: contact seepage, confining pressure, effect analysis, particle erosion, failure condition

CLC Number: 

  • TU43

Fig.1

Device of soil-structure interfacial erosion test"

Fig.2

Diagram of soil sample and loading"

Table 1

Soil sample material ratio"

黏粒质量分数/% 不同颗粒粒径的石英粉质量分数/%
5 μm≤r＜7.5 μm 7.5 μm≤r＜12 μm 12 μm≤r＜18 μm 18 μm≤r＜35 μm 35 μm≤r＜75 μm
5 45 20 10 10 10
9 41 20 10 10 10
12 38 20 10 10 10
15 35 20 10 10 10

Table 2

Parameters of each soil sample"

土样编号 黏粒质量分数/% 塑限/% 液限/% 塑性指数 液性指数(含水率20%)
1-1 5 20.85 31.47 10.62 -0.08
1-2 9 20.66 32.18 11.52 -0.06
1-3 12 20.29 33.23 12.94 -0.02
1-4 15 19.88 34.46 14.57 0.01

Table 3

Calibration of surface roughness treatment parameters"

编号 砂径/μm 压力/kPa 粗糙度/μm
1 1 000~1 250 600 75
2 630~800 600 65
3 630~800 400 55
4 500~630 400 45
5 1 000~1 250 300 35
6 630~800 300 20

Table 4

Erosion test scheme under combined action of seepage and pressure"

工况 试验因素
粗糙度/μm 黏粒质量分数/% 围压/kPa
1 55 5 50
2 55 5 80
3 55 5 120
4 55 5 150
5 55 9 50
6 55 9 80
7 55 9 120
8 55 9 150
9 55 12 50
10 55 12 80
11 55 12 120
12 55 12 150
13 55 15 50
14 55 15 80
15 55 15 120
16 55 15 150
17 35 15 120
18 65 15 120
19 75 15 120

Fig.3

Erosion test results of condition 3/15/19"

Table 5

Test results for each condition indicator"

工况 迁移水力/kPa 冲蚀水力/kPa 切向变形/mm 法向变形/mm
1 15 29 0.49 31.69
2 27 32 0.53 26.35
3 30 42 0.47 23.38
4 35 40 0.51 21.86
5 17 50 0.03 1.40
6 32 69 0.10 7.96
7 33 71 0.24 14.98
8 42 77 0.42 15.98
9 32 58 0.00 0.46
10 50 70 0.01 0.08
11 57 77 0.20 8.22
12 62 80 0.32 11.54
13 37 58 0.00 0.13
14 57 86 0.05 0.32
15 72 109 0.17 6.09
16 100 126 0.26 10.10
17 62 107 0.18 9.41
18 87 113 0.08 2.18
19 106 115 0.04 0.92

Table 6

Variance analysis for hydraulic conditions of particle migration at various factors"

来源 偏差平方和 自由度 均方和 F
因素A 4 658.60 3 1 552.87 2.52
因素B 1 504.03 3 501.34 0.81
因素C 802.29 3 267.43 0.43
误差 5 547.61 9 616.40
总偏差 12 512.53 18

Table 7

Variance analysis for hydraulic conditions of particle erosion at various factors"

来源 偏差平方和 自由度 均方和 F
因素A 4 304.85 3 1 434.95 1.58
因素B 2 313.68 3 771.23 0.85
因素C 740.74 3 246.91 0.27
误差 8 165.26 9 907.25
总偏差 15 524.53 18

Table 8

Variance analysis for tangential deformation condition at various factors"

来源 偏差平方和 自由度 均方和 F
因素A 0.054 3 0.018 0.35
因素B 0.100 3 0.033 0.65
因素C 0.030 3 0.010 0.19
误差 0.465 9 0.052
总偏差 0.650 18

Table 9

Variance analysis for normal deformation condition at various factors"

来源 偏差平方和 自由度 均方和 F
因素A 150.94 3 28.260 0.37
因素B 307.03 3 176.301 0.76
因素C 63.29 3 127.449 0.16
误差 1 219.71 9 40.317
总偏差 1 740.97 18

Fig.4

Influence trend of clay content on each seepage condition index"

Fig.5

Influence trend of confining pressure on each seepage condition index"

Fig.6

Influence trend of confining pressure on each seepage condition index when σ=120 kPa and wC=15%"

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