Abstract
Grouted soil–concrete interfaces exist in bored piles with post-grouting in pile tip or sides and they have a substantial influence on pile skin friction. To study the effect of grouting volume on the shearing characteristics of the interface between cohesive soil and concrete piles with different roughness, grouting equipment and a direct shear apparatus were combined to carry out a total of 48 groups of direct shear tests on cohesive soil–concrete interfaces incorporating the grouting process. The test results showed that the shear behavior of the grouted cohesive soil–concrete interface was improved mainly because increasing the grouting volume and roughness increased the interfacial apparent cohesion. In contrast, increasing the grouting volume and roughness had no obvious increasing effects on the interfacial friction angle. Interfacial grouting contributed to the transition in the grouted cohesive soil from shrinkage to dilation: as the grouting volume increased, the shrinkage became weaker and the dilation became more obvious. The shear band exhibited a parabolic distribution rather than a uniform distribution along the shearing direction and that the shear band thickness was greater in the shearing direction, and it will become thicker with increasing grouting volume or roughness. The analysis can help to understand the shear characteristics of soil–pile interface in studying the vertical bearing properties of pile with post-grouting in tip or sides.
Highlights
Grouting technology, which provides good mechanical property improvements, is widely used in engineering applications, such as tunnel engineering, pile foundation engineering, and construction [1].In the ultralong, bored, cast-in-place piles used in high-rise buildings, the slurry used to prevent hole wall collapse and the mud sedimentation at the bottom of the pile decrease pile shaft friction, which substantially decreases the bearing capacity of the pile [2]
The direct shear test was performed on a large-scale multifunctional interfacial shearing at the Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, instrument at the Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Tongji University (Shanghai, China); some modifications were made to the instrument to ensure
It can be clearly found that the increase of the roughness and grouting volume can thicken the shear band by a maximum of 13.3%, which contributes to increasing the interfacial shear strength
Summary
Grouting technology, which provides good mechanical property improvements, is widely used in engineering applications, such as tunnel engineering, pile foundation engineering, and construction [1]. Zhao [17] used the discrete element method (DEM) to simulate the interface direct shear behavior of granular soil and rough surface, and discovered the micro-mechanisms of the interface shear band deformation. In order to study the effect of grouting volume on the shearing characteristics of the interface between cohesive soil and concrete piles with different roughness, the multifunctional direct shear. These results from the grouted cohesive soil–concrete increase of the shear band thickness with increasing grouting volume and roughness These results interfaces provide experimental support for understanding and analyzing thefor vertical bearing from the grouted cohesive soil–concrete interfaces provide experimental support understanding characteristics of piles with post-grouting in tip or sides. Analyzing the vertical bearing characteristics of piles with post-grouting in tip or sides
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