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Experimental Studies on cyclic shear Behavior of Steel-Clay Interface Under Constant Normal Load

China Ocean Engineering 2023年第3期37卷 519-524页

作者： YU Shi-wen WANG Jie LIU Jun-wei WANG Teng School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China China Communications Third Harbor Engineering Co. Ltd.ShanghaiChina School of Civil Engineering Qingdao University of TechnologyQingdao 266520China

The degradation of the shear stress between pile-clay interface caused by undrained cyclic jacking affects the jacking force.A series of large displacement monotonic shear,cyclic shear and post-cyclic monotonic steel plate-clay interface shear te sts were performed under the constant normal load(CNL)condition to inve stigate the effects of normal stre ss,cyclic amplitude,and number of cycles on a steel plate-clay interface using the GDS multi-function interface shear *** on the experimental results,in monotonic shear tests,change of shear stress took place in the specimen,the shear stress rapidly reached the peak value at shear displacement of 1 mm,and then abruptly decreased to the residual *** cyclic shear te sts,accumulated displacement was a better parameter to describe the soil degradation characteristics,and the degradation degree of shear stress became greater with the increasing of normal stress and accumulated *** stress in post-cyclic monotonic shear tests did not generate a peak value and was lower than that in monotonic shear tests under the same normal *** soil was completely disturbed and reached the residual strength when the cumulative displacement approached 6 *** empirical equation to evaluate shear stress degradation mechanism was formulated and the procedure of parameter identification was presented.

关键词： cyclic shear steel-clay interface constant normal load cumulative displacement residual strength

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A five-parameter constitutive model for hysteresis shearing and energy dissipation of rock joints

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International Journal of Mining Science and Technology 2022年第4期32卷 737-746页

作者： Yikun Li Tongbin Zhao Yifei Li Yang Chen College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China National Demonstration Center for Experimental Mining Engineering Education Shandong University of Science and TechnologyQingdao 266590China School of Civil and Transportation Engineering Qinghai Nationalities UniversityXining 810007China Shandong Energy Group Co. Ltd.Jinan 250014China

Rock joints exhibit hysteresis shearing behavior and produce energy dissipation under shear cyclic loads,which however cannot be accurately depicted by existing constitutive models. This paper establishes a constitutive model for hysteresis shearing and associated energy dissipation of rock joints. Analytical expressions of the model during cyclic shearing processes are derived. Derivation of the model indicates no energy dissipation in the elastic stage. When the shear load exceeds elastic boundary, nonlinear energy dissipation takes place. Validations with experiments show that the proposed model provides good conformities with direct shear curves and hysteresis loops, and can predict the energy dissipation characteristics of rock joints under different working conditions. Compared to the constitutive models using Weibull's distribution, the proposed one is smooth at the elastic boundary and can accurately capture the maximum shear stress. Unlike the existing incremental-type models, the proposed one provides clear and direct analytical expressions for both shear stress and energy dissipation during the whole displacement domain, which is more convenient in application.

关键词： Iwan model Rock joint cyclic shear Hysteresis Energy dissipation

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