期刊
SUSTAINABILITY
卷 14, 期 24, 页码 -出版社
MDPI
DOI: 10.3390/su142416730
关键词
true triaxial test; aeolian sand; three-dimensional stress state; initial shear stress; pore pressure
资金
- Projects for Leading Talents of Science and Technology Innovation of Ningxia [KJT2019001]
- National Natural Science Foundation of China [12162028]
- innovation team for multi-scale mechanics and its engineering applications of Ningxia Hui Autonomous Region
- Key R&D Project of Ningxia Hui Autonomous Region [2021BEG03118]
Investigated the cyclic behavior of desert subgrade under initial shear stress conditions and found that the initial shear stress level significantly influences the cyclic response. With the increase in initial shear stress, the permanent strain increases first and then decreases, with the maximum permanent strain occurring at 50 kPa. The cyclic resistance decreases with the increase in the coefficient of cyclic intermediate principal stress.
Under traffic loading, the soil elements in subgrade are subjected to a complex 3D stress path. To investigate the cyclic behavior of desert subgrade under initial shear stress conditions, the number of cyclic true triaxial tests were implemented on aeolian sand from the Tengger Desert. A large range of initial shear stress levels and different cyclic stress paths (various combinations of cyclic major and intermediate principal stresses) were designed in the experiments. The results show that the initial shear stress level significantly influences the cyclic response, and the response mode of aeolian sand under initial shear stress is incremental failure and elastic shakedown, while it is critical failure without initial shear stress. With the increase in initial shear stress, the permanent strain increases first and then decreases, with the maximum permanent strain occurring at q(0) = 50 kPa. Moreover, by comparing the test data under different cyclic stress paths, it is found that the cyclic resistance decreases with the increase in the coefficient of cyclic intermediate principal stress b(cyc). Compared to the limiting pore pressure criterion, the conventional 5% axial strain failure criterion may overestimate the cyclic resistance, leading to unsafe evaluation and design. Therefore, by using the pore pressure criterion, the relationship between the limit pore pressure ratio and the initial stress condition was investigated and it was found that the limit pore pressure ratio decreased linearly when the initial shear stress increased.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据