注浆条件对钻孔灌注桩基础砂-混凝土界面卸荷力学行为的影响

Influence of Grouting Condition on Unloading Mechanical Behavior of Bored Pile

文中分析了不同注浆条件下卸载灌浆砂-混凝土界面的力学行为和注浆模式转变规律。结果表明,在相同注浆量下,随着注浆压力的增大,界面黏结力先增大后减小;在较低的注浆压力下,注浆水泥主要通过提高界面黏结力来改善砂-混凝土界面力学性能;在较高的注浆压力下,注浆水泥通过提高界面黏结力和摩擦角来改善界面的剪切性能。文中揭示了压密注浆和破裂注浆的扩散过程,特别是注浆模式的转变主要受注浆压力和注浆量的影响。

This article analyzes the mechanical behavior and grouting mode transition of the unloading grouting sand concrete interface under different grouting conditions.The results of the direct shear test show that under the same grouting amount,with the increase of grouting pres-sure,the interface bonding force first increases and then decreases.At lower grouting pressure,the grouting cement mainly improves the me-chanical properties of the sand concrete interface by increasing the interface bonding force.At higher grouting pressure,the grouting cement improves the shear performance of the interface by increasing the interface bonding force and friction angle.Revealed the diffusion process of compacted grouting and fractured grouting,especially the transformation of grouting mode mainly influenced by grouting pressure and grouting volume.