Calculation of Pile-Soil Stress Ratio of Cement-Soil Mixing Pile Composite Foundation and Cushion Optimization Design

Liu Guangxiu; Dang Faning; Ma Xiaoli; Li Yugen

doi:10.20174/j.JUSE.2025.04.29

Chinese Journal of Underground Space and Engineering >

2025 , Vol. 21 >Issue 4: 1373 - 1383

DOI: https://doi.org/10.20174/j.JUSE.2025.04.29

Calculation of Pile-Soil Stress Ratio of Cement-Soil Mixing Pile Composite Foundation and Cushion Optimization Design

Liu Guangxiu ,
Dang Faning ,
Ma Xiaoli ,
Li Yugen

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1. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, P.R. China;
2. School of Architecture Engineering, Yulin University, Yulin, Shaanxi 719000, P.R. China;
3. Key Laboratory for Special Soil Mechanics and Engineering of Yulin, Yulin, Shaanxi 719000, P.R. China

Received date: 2025-01-07

Online published: 2025-09-03

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Abstract

The theoretical calculation method of pile-soil stress ratio of cement-soil mixing pile composite foundation with cushion under rigid foundation and the optimal design of cushion layer was studied. Firstly, based on the analysis of the mechanical deformation characteristics of cement-soil mixing pile composite foundation, the equivalent reinforcement area of single pile was taken as analysis unit, the distribution of pile side friction was simplified into a piecewise linear model, and the critical length of cement-soil mixing pile in composite foundation was defined from the perspective of bearing capacity. Then, based on the load transfer differential equation of the unit body, the pile-soil deformation coordination condition at the neutral plane depth, and the mechanical equilibrium relationship of the pile body at the critical pile length, a new method for calculating the pile-soil stress ratio of a cement-soil mixing pile composite foundation, considering negative friction, was established. The feasibility of the calculation method was verified by engineering examples, and the influence of cushion thickness, cushion modulus, pile diameter, pile spacing, pile-soil modulus and other factors on the pile-soil stress ratio were analyzed. The results show that: The pile-soil stress ratio decreases with the increase of cushion thickness and compression modulus of soil between piles, increases with the increase of cushion modulus, pile spacing and pile elastic modulus, and increases first and then decreases with the increase of pile diameter. The effect of pile-soil area replacement ratio on pile-soil stress ratio is not the only monotonic relationship, but is affected by the pile diameter and pile spacing. Finally, according to the design index of pile-soil stress ratio, the flexibility coefficient of cushion was obtained by inversion of this calculation method, and the thickness of cushion was optimized by combining with regional experience.

Key words： composite foundation; cement-soil mixing pile; negative friction; pile-soil stress ratio; critical length of pile; cushion

Cite this article

Liu Guangxiu , Dang Faning , Ma Xiaoli , Li Yugen . Calculation of Pile-Soil Stress Ratio of Cement-Soil Mixing Pile Composite Foundation and Cushion Optimization Design[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(4) : 1373 -1383 . DOI: 10.20174/j.JUSE.2025.04.29

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