Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (1): 156-164.doi: 10.13229/j.cnki.jdxbgxb20181171

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Modified hyperbola model of interface between unsaturated remolded loess and concrete

Deng-hui GAO1,2(),Yi-chuan XING2,Min-xia GUO3,Ai-jun ZHANG3,Xian-tao WANG4,Bao-hong MA5   

  1. 1. Department of Architectural and Civil Engineering, University of Huanghuai, Zhumadian 463000, China
    2. China Institute of Water Resources and Hydropower Research, Beijing 100048, China
    3. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
    4. Department of Architectural Engineering, Zhumadian Vocational and Technical College, Zhumadian 463000, China
    5. Gansu Provincial Highway Aviation Tourism Investment Group, Lanzhou 730030, China
  • Received:2018-11-26 Online:2020-01-01 Published:2020-02-06

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Abstract:

In order to solve the problem of interface calculation between unsaturated soil and structure coupled force and water, the direct shear tests of remolded loess and concrete interface with different moisture content were carried out. Firstly, the relationships between the initial shear stiffness coefficient, the ultimate shear strength and the normal stress in the hyperbolic model are simplified based on the test rule. Then the water content is introduced to establish the modified hyperbolic model suitable for unsaturated soil, which has six parameters and can be obtained by direct shear test of interface with different moisture content. The feasibility of the model is demonstrated by comparing the calculated results with the test results. The modified hyperbola model can consider both normal stress and moisture content, and can be used to calculate the interface mechanics between unsaturated soil and structure.

Key words: geotechnical engineering, unsaturated loess, interface, direct shear test, hyperbolic model

CLC Number: 

  • TU4

Table 1

Basic characteristic of undisturbed loess"

埋深/m 比重 干密度/(g?cm-3) 液限/% 塑限/%
3 2.71 1.27 35.3 17.9
4 2.71 1.29 33.3 17.4
5 2.71 1.27 34.6 16.6

Fig.1

"

Fig.2

"

Fig.3

"

Fig.4

Relationship curves of k?σ n "

Table 2

Values of k s i and τ u "

σ n /kPa w=10% w=15% w=20% w=25%
k s i /(kPa·mm-1) τ u /kPa k s i /(kPa·mm-1) τ u /kPa k s i /(kPa·mm-1) τ u /kPa k s i /(kPa·mm-1) τ u /kPa
50 63.3 41.0 59.9 36.5 45.0 32.3 40.0 26.8
100 76.3 70.0 63.3 61.7 48.3 59.2 48.8 53.2
200 96.2 149.3 88.5 131.6 82.0 126.6 75.8 108
300 122.0 222.2 117.6 200.0 114.9 178.6 109.9 164
400 138.9 303.0 137.0 277.8 128.2 250.0 123.5 192

Fig.5

Relationship curves of k si?σ n "

Fig.6

Relationship curves of τ u?σ n "

Table 3

Fitting parameter values of k si?σ nand τ u ?σ n "

w/% s t m n
10 0.218 53.54 0.733 -1.28
15 0.234 44.12 0.693 -4.03
20 0.261 28.98 0.615 -0.69
25 0.254 26.25 0.516 2.74

Fig.7

Relationship curves of t?w "

Fig.8

Relationship curves of m ? w "

Fig.9

"

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