首页|Testing and modeling of frozen clay-concrete interface behavior based on large-scale shear tests

Testing and modeling of frozen clay-concrete interface behavior based on large-scale shear tests

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  • 国家科技期刊平台
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The shear behavior of the frozen soil-structure interface is important for accurately predicting the interface responses of structures adopted in the cold regions.The purpose of this study is to experimentally and theoretically investigate the shear behavior of frozen clay-concrete interface under engineering conditions.A large-scale direct shear apparatus with a temperature-controlled shear box is used to test the inter-face behavior.Test specimens consisting of a cement concrete block and frozen soil with initial water content ranging between 14.6％and 24.6％were prepared at different conditions of temperatures(15.4 to-9.8℃),shear rates(0.03-0.9 mm min-1),and normal stresses(50-200 kPa).It is found that the peak shear strength is linear developing with increasing of normal stress,initial water content,and temperature.It increased from 67.7 to 133.3 kPa as the initial water content increased from 14.9％to 24.6％at temperature of-6.8 to-6.6℃,and it increased from 51.2 to 80.6 kPa with temperature decreasing from 15.4 to-9.8℃at initial water content of 14.6％-14.9％,furthermore it has a power law relationship with shear rate.The final vertical displacement increases with the decreasing temperature,and increasing initial water content.While,it is slight or could be ignored at lower shear rates(e.g.0.03 mm min-1 and 0.15 mm min-1)and it is-0.25 mm and-0.28 mm at shear rate of 0.3 mm min-1 and 0.9 mm min-1,respectively.In addition,the evolution of vertical displacement also varies with test condition,the growth rate at beginning increases with increasing initial water content and decreasing temperature or ice content,which is because of the ice film effects the particle size.Moreover,a disturbed state concept model combined with linear and nonlinear characteristics is developed to describe the interface shear behavior.The disturbance D reflects the interface mechanical response and responds differently trend for different test conditions,increasing faster with increasing temperature and decreasing initial water content or shear rate.The testing results,including the test and model results,can be used to simulate the performance of engineered geotechnical assets such as earth dams or irrigation channels with concrete linings in cold regions.

Shear strengthFrozen clay-concrete interfaceDisturbed state conceptConstitutive model

HE Peng-Fei、MU Yan-Hu、MA Wei、HUANG Yong-Ting、DONG Jian-Hua

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State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,730000,China

School of Science,Lanzhou University of Technology,Lanzhou,730050,China

University of Chinese Academy of Sciences,Beijing,100049,China

Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou,730050,China

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This work was supported by the Scientific Instrument Developing Project of the Chinese Academy of ScienceNational Natural Science Foundation of ChinaNational Natural Science Foundation of Chinaand the Scholarship for LUT Teachers'Overseas Studies,and Open Fund of National Key Laboratory of Frozen Soil Engineering

28Y9285814177232542001058SKLFSE201603

2021

气候变化研究进展(英文版)
国家气候中心

气候变化研究进展(英文版)

CSCDSCI
影响因子：0.806
ISSN：1674-9278
年,卷(期)：2021.12(1)
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