Experimental study on the shear characteristics of frozen
soil-concrete interface under the constant normal stiffness
Shibin Yuan 1,2, Jiaming Cong 1,
Xuguang Fang 1,2*, Yue Wu 1,
Huaichen Yu 1
(1. State Grid Heilongjiang Electric Power Company Limited Daxinganling
Power Supply Company, Heilongjiang 165000, China
2. Lanzhou University of Technology,Lanzhou 730050, China)
*Corresponding author:X. Fang, E-mail: fangxg2000@163.com
Abstract: The interaction between the structure and soil is the
key factor for infrastructure stabilization in permafrost engineering.
In this study, the shear mechanical behavior of the interface between
concrete and permafrost under different normal stiffness, temperature
and water content is investigated by using the interface direct shear
test under temperature-controlled conditions. The results show that with
the increase of temperature and water content, the initial shear
stiffness of the interface shear stress-shear displacement curve
gradually increases, and the interface shear strength gradually
increases. Different normal stiffnesses have a small effect on the
morphology of the interfacial shear stress-shear displacement curve, but
have a significant effect on the peak shear strength. The peak shear
strength increases significantly with the increase of normal stiffness,
and this trend is more obvious with the decrease of temperature. The
corresponding interfacial cohesion and friction angle also increase with
the increase of normal stiffness.
Keywords: constant normal stiffness; frozen soil; interfacial
shear strength; shear; boundary condition