1. Influence mechanism of structure on shear mechanical deformation characteristics of loess-steel interface
- Author
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Ya-zhi Wei, Zhi-hua Yao, Xiao-lei Chong, Jian-hua Zhang, and Jun Zhang
- Subjects
Tribology ,Compressive Strength ,Pedology ,Loess ,Soil ,Mathematical and Statistical Techniques ,Materials Physics ,Shear Stresses ,Microstructure ,Sedimentary Geology ,Multidisciplinary ,Geography ,Physics ,Statistics ,Classical Mechanics ,Geology ,Built Structures ,Deformation ,Biomechanical Phenomena ,Physical Sciences ,Engineering and Technology ,Mechanical Stress ,Regression Analysis ,Medicine ,Shear Strength ,Research Article ,China ,Friction ,Structural Engineering ,Surface Properties ,Science ,Materials Science ,Material Properties ,Soil Science ,Research and Analysis Methods ,Mechanical Properties ,Humans ,Statistical Methods ,Petrology ,Mechanical Phenomena ,Damage Mechanics ,Construction Materials ,Mechanical Engineering ,Construction Industry ,Water ,Steel ,Earth Sciences ,Sediment ,Stress, Mechanical ,Mathematics - Abstract
The mechanical properties of loess-steel interface are of great significance for understanding the residual strength and deformation of loess. However, the undisturbed loess has significant structural properties, while the remolded loess has weak structural properties. There are few reports on the mechanical properties of loess-steel interface from the structural point of view. This paper focused on the ring shear test between undisturbed loess as well as its remolded loess and steel interface under the same physical mechanics and test conditions (water content, shear rate and vertical pressure), and explored the influence mechanism of structure on the mechanical deformation characteristics of steel-loess interface. The results show that the shear rate has little effect on the residual strength of the undisturbed and remolded loess-steel interface. However, the water content has a significant influence on the residual strength of the loess-steel interface, moreover, the residual internal friction angle is the dominant factor supporting the residual strength of the loess-steel interface. In general, the residual strength of the undisturbed loess-steel interface is greater than that of the remolded loess specimen (for example, the maximum percentage of residual strength difference between undisturbed and remolded loess specimens under the same moisture content is 6.8%), which is because that compared with the mosaic arrangement structure of the remolded loess, the overhead arrangement structure of the undisturbed loess skeleton particles makes the loess particles on the loess-steel interface re-adjust the arrangement direction earlier and reach a stable speed relatively faster. The loess particles with angular angles in the undisturbed loess make the residual internal friction between the particles greater than the smoother particles of the remolded loess (for example, the maximum percentage of residual cohesion difference between undisturbed and remolded loess specimens under the same vertical pressure is 4.29%), and the intact cement between undisturbed loess particles brings stronger cohesion than the remolded loess particles with destroyed cement (for example, the maximum difference percentage of residual cohesion between undisturbed and remolded soil specimens under the same vertical pressure is 33.80%). The test results provide experimental basis for further revealing the influence mechanism of structure, and parameter basis for similar engineering construction.
- Published
- 2022