Abstract
In order to study the effect of roughness on the mechanical parameters of silty clay-concrete interface, and to explore the applicability of silicon piezoresistive sensor to test the interface pressure, a large-scale direct shear test system was used to carry out experimental research on the shear characteristics of silty clay-concrete interface under different roughness conditions. Based on silicon piezoresistive sensor, the shear characteristics of silty clay-concrete interface are analyzed. The results show that the silicon piezoresistive sensor has excellent performance in measuring the interface pressure and can accurately obtain the shear characteristics of the silty clay-concrete interface. The roughness has a significant influence on the shear strength, shear stiffness, and other mechanical properties of the prefabricated pile-soil interface. With the increase of roughness, interface shear strength, interface friction angle, shear stiffness coefficient, and interface residual shear stress all show an increasing trend, with the maximum increase of 37.0%. The interface adhesion decreased first and then increased with the increase of roughness, with an increase of 23.7%. The test results can provide reference for the engineering practice of jacked pile.
Highlights
In recent years, with the continuous and in-depth research on jacked pile technology, many scholars at home and abroad have begun to conduct in-depth research on the problems existing in the pile-soil interface, and the stress characteristics of the pile-soil interface have become the mainstream of research [1,2,3]
Studies on the mechanical characteristics of pile-soil interface mainly focus on the acquisition and separation of shear strength indexes under load to analyze the relationship between shear strength and normal stress, friction coefficient and soil strength, and the interface friction coefficient and the roughness of contact surface [4]
Indoor direct shear test has gradually become the main research method due to its advantages of controllable variables, low cost, and easy operation. e direct shear test simulates different working conditions by changing soil types and external stress conditions to obtain the relevant parameters of shear characteristics and reveal the influencing factors and change rules in the pile-soil interaction process
Summary
With the continuous and in-depth research on jacked pile technology, many scholars at home and abroad have begun to conduct in-depth research on the problems existing in the pile-soil interface, and the stress characteristics of the pile-soil interface have become the mainstream of research [1,2,3]. Song et al [19] conducted experimental research on the shear characteristics of sliding-zone soils with different moisture content based on large indoor direct shear apparatus. Erefore, in order to further solve practical engineering problems, the influences of roughness, water content, and shear rate on soil-structure interface shear stiffness and failure deformation should be studied in addition to shear strength, which is rarely studied at present. Through the direct shear model test of the pile-soil interface, the variation of shear stress and displacement at different friction stages during the interface shearing process are analyzed by factors such as interface roughness and effective normal stress. E effect of roughness on shear failure displacement and interfacial shear stiffness was studied, and the mechanism of the influence of the above factors on the shear properties of silty clay-concrete interface was explained at a meso level
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