Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (S1): 513-520.doi: 10.16285/j.rsm.2021.1702

• Geotechnical Engineering • Previous Articles     Next Articles

Estimation of soil displacement during installing a vertical jet grouting column

SUI Bo-dong1, 2   

  1. 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).

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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

CLC Number: 

  • TU473
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