桩端后注浆浆液上返高度的理论研究

在幂律型浆液平板窄缝流动模型的基础上，推导出了桩端后注浆浆液上返高度的计算公式。并对上返高度随注浆压力、桩埋深、桩径、泥皮厚度的变化情况进行计算分析，分析结果表明，在其他条件一定时，变形模量越大的土层，浆液上返高度越小；注浆压力越大，浆液上返高度越大；桩埋深越大，浆液的上返高度越小；桩侧泥皮越厚，浆液的上返高度越大。通过工程实例验证了本文计算结论的适用性。

Theoretical study of climbing height of grout in pile-bottom base grouting

Basing on the assumptions of exponential fluid and narrow plate model, formula of climbing height in base post-grouting is deduced. It is shown that the climbing height is mainly related to grouting pressure, pile length, pile diameter and mudcake thickness. The climbing height increases with the decrease of soil deformation modulus and pile length. And it increases with the increase of grouting pressure and mudcake thickness. At last, the formula of climbing height is verified by case study.