单根垂直旋喷桩施工引起土体位移的预测方法

doi:10.16285/j.rsm.2021.1702

岩土力学 ›› 2022, Vol. 43 ›› Issue (S1): 513-520.doi: 10.16285/j.rsm.2021.1702

单根垂直旋喷桩施工引起土体位移的预测方法

睢博栋^{1, 2}

1. 同济大学地下建筑与工程系，上海 200092；2. 同济大学岩土及地下工程教育部重点实验室，上海 200092

收稿日期:2021-10-11 修回日期:2021-12-27 出版日期:2022-06-30 发布日期:2022-07-15
作者简介:睢博栋，男，1992年生，硕士研究生，主要从事岩土与地下工程方面的研究工作。
基金资助:
杭州市城乡建设委员会科研项目（No.2017028）。

Estimation of soil displacement during installing a vertical jet grouting column

SUI Bo-dong^{1, 2}

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical & Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

Received:2021-10-11 Revised:2021-12-27 Online:2022-06-30 Published:2022-07-15
Supported by:
This work was supported by the Research Project of Hangzhou Urban and Rural Construction Commission(2017028).

摘要/Abstract

摘要： 垂直旋喷桩施工时喷嘴向周围土体注入大量流体（水泥浆或水），使土体有显著的侧向移动。通过对单根垂直旋喷桩施工的分析，认为施工引起土体侧向位移的大小等于无限土体中圆柱孔扩张引起土体位移的大小，提出了单根垂直旋喷桩施工引起土体侧向位移的预测方法；研究分析了单根垂直旋喷桩施工对土体应力的影响，给出了施工结束时土体弹性区和塑性区交界面应力的简化计算公式；以单位桩长为研究对象，考虑了施工参数和土层参数，基于无量纲原理，提出了圆柱孔半径（确定位移的关键参数）的计算公式。将该方法应用到垂直旋喷桩工程案例进行计算，计算值与实测值的对比证明了该方法的合理性；通过该方法计算出垂直旋喷桩的施工影响范围约为成桩直径的7.5倍。

关键词: 地基处理, 垂直旋喷, 圆柱孔扩张, 土体位移, 预测方法

Abstract: During vertical jet grouting, the nozzle injects a large amount of fluid (cement slurry or water) into the surrounding soil, which leads to significant lateral ground displacements. Based on the analysis of the installation of a vertical jet grouting column, assuming that the lateral ground displacement caused by jet grouting is equal to that induced by cylindrical cavity expansion in infinite soil mass, a simplified calculation method of lateral displacement of subsoils caused by installing a vertical jet grouting column is proposed. With the analysis of the effect of installing the vertical jet grouting column on soil stress, a formula for calculating the soil stress at the elasto-plastic interface after construction is deduced. Taking installation of vertical jet grouting column with unit length as the research object and considering operational parameters and soil parameters, a formula of cylindrical cavity radius (key parameter for determining lateral displacements) is proposed based on the dimensionless principle. This method is applied to the engineering case of vertical jet grouting, and the comparison of prediction results and the observed data proves the reasonability of this method. By calculating with this method, the influence range of installing the vertical jet grouting column is approximately 7.5 times of the column diameter.

Key words: soil improvement, vertical jet grouting, cylindrical cavity expansion, soil displacement, prediction method

中图分类号: TU473

睢博栋 . 单根垂直旋喷桩施工引起土体位移的预测方法[J]. 岩土力学, 2022, 43(S1): 513-520.

SUI Bo-dong, . Estimation of soil displacement during installing a vertical jet grouting column[J]. Rock and Soil Mechanics, 2022, 43(S1): 513-520.

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单根垂直旋喷桩施工引起土体位移的预测方法

Estimation of soil displacement during installing a vertical jet grouting column

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