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Mechanism of soil breaking and prediction of pile diameter in silty clay by jet grouting using CFD-DEM coupling
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DOI：10.1016/j.compgeo.2026.108480.png)
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Abstract
En 中文
High-pressure jet grouting technology has been commonly used in foundation treatment, but its soil-breaking and pile-forming mechanism remains unclear and a reliable prediction of pile diameter is challenging. For this specific purpose, a high-pressure jet model considering multiphase coupling effects is established with CFD-DEM coupling method in this study, to investigate jet characteristics, soil response, and influence mechanisms of key parameters for both the single and triple fluid jet grouting method. Taking silty clay as the research object, the microscopic parameters of the Discrete Element Method (DEM) are calibrated through Box-Behnken experimental design. This study focuses on the development of jet turbulence, movement and force characteristics of soil particles, exploring the influence of soil internal friction angle, jet pressure, and secondary jet on erosion effects. A formula for predicting pile diameter is proposed based on the turbulent jet theorem, which is well validated by numerical results and engineering measured data. Research results indicate that in the single fluid jet grouting, the erosion rate is fast within 0–5 ms and slow during 5–15 ms, showing turbulent flow characteristics; when the soil internal friction angle increases from 15° to 35°, the ultimate erosion length decreases from 0.53 m to 0.34 m. The triple fluid jet grouting has stronger erosion ability compared to the single fluid jet grouting. Soil particle movement entrained by the secondary jet in the triple fluid jet grouting causes a significant change in cavity morphology. The relative errors between the theoretical values of the pile diameter prediction equation derived based on the turbulent jet theorem and the simulated data and measured data are all less than 10%.
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