Shear Behavior of Silty Clay–Concrete Interface Based on Large-Scale Direct Shear Test
Publication: International Journal of Geomechanics
Volume 23, Issue 7
Abstract
This paper presents the results of an experimental study on saturated silty clay–concrete interface shear behavior, and a shear strength prediction model is established for the silty clay–concrete interface. Based on three-dimensional (3D) scanning data of actual concrete pile surfaces, regular and irregular concrete surfaces with different roughnesses are replicated in the laboratory tests. The interface shear strength is found to increase as the roughness coefficient of concrete increases; the shear process of a regular interface shows a strain softening feature, while that for an irregular interface shows strain hardening. The effect of a normal stress increase on the residual strength of a regular interface is more obvious. The modified Grasselli roughness evaluation method is reasonably effective in characterizing both regular and irregular contact surfaces. In the framework of this method, a prediction formula for the estimation of peak strength of a clay–concrete interface is proposed, which performs favorably well in comparison with test results obtained from this and previous studies.
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Acknowledgments
We are thankful for financial support given by the National Natural Science Foundation of China (Grant No. 51808421), the Science and Technology Project of China Railway Construction Group Co., Ltd. (Grant Nos. LX19-27c, LX20-32c), and the Science and Technology Planning Project of Wuhan Urban Construction Committee (Grant No. 201637).
Notation
The following symbols are used in this paper:
- effective contact area ratio;
- A0
- normalized surface area steeper than 0° in the analysis direction;
- C
- fitting parameter of roughness;
- c
- cohesion of soil;
- cp
- peak cohesive force;
- cR
- residual cohesive force;
- fcu
- concrete cube strength;
- K
- fitting coefficient of peak shear strength;
- RG
- roughness coefficient of Grasselli method;
- RMG
- roughness coefficient of modified Grasselli method;
- Ry
- roughness coefficient of sand-pouring method;
- w/c
- water–cement ratio;
- apparent dip angle;
- apparent dip angle in maximum shear direction;
- σ
- residual cohesive force;
- τ
- shear strength of soil;
- τP
- peak shear strength;
- τR
- residual shear strength;
- φ
- friction angle of soil;
- φp
- peak internal frictional angle; and
- φR
- residual internal frictional angle.
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Published In
International Journal of Geomechanics
Volume 23 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 10, 2022
Accepted: Dec 16, 2022
Published online: Apr 19, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 19, 2023
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