水泥土搅拌桩复合地基桩土应力比计算与垫层优化

刘光秀; 党发宁; 马小莉; 李玉根

doi:10.20174/j.JUSE.2025.04.29

地下空间与工程学报 >

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

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

设计、施工、监测

水泥土搅拌桩复合地基桩土应力比计算与垫层优化

刘光秀 ,
党发宁 ,
马小莉 ,
李玉根

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1.西安理工大学岩土工程研究所,西安 710048;
2.榆林学院建筑工程学院,陕西榆林 719000;
3.榆林市特殊土力学与工程重点实验室,陕西榆林 719000

刘光秀(1986—),男,陕西榆林人,博士生,副教授,主要从事岩土工程方面的研究。E-mail: liuguangxiu789@163.com

党发宁(1962—),男,陕西富平人,博士生导师,教授,主要从事岩土工程及水工结构数值分析方面的研究。E-mail: dangfn@ mail.xaut.edu.cn

收稿日期: 2025-01-07

网络出版日期: 2025-09-03

基金资助

国家自然科学基金 (51979225) ;陕西省重点研发计划重点产业创新链(群)项目(2022ZDLSF07-02);陕西省自然科学基础研究计划项目(2024JC-YBMS-415);榆林高新区科技计划项目(CXY-2021-21);榆林市BIM技术应用及装配式建筑智慧建造重点实验室(CXY-2021-146)

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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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摘要

开展了刚性基础下设置褥垫层的水泥土搅拌桩复合地基桩土应力比计算及褥垫层优化设计研究。首先在对水泥土搅拌桩复合地基受力变形特性分析的基础上,取单桩等效加固单元体为研究对象,将桩侧摩阻力简化为分段线性分布模式,并从承载力角度定义水泥土搅拌桩的临界桩长。继而利用单元体荷载传递微分方程,基于中性面深度处桩—土变形协调条件及临界桩长处桩体的力学平衡关系,建立了作用负摩阻力的水泥土搅拌桩复合地基桩土应力比的计算方法。通过工程实例验证了该计算方法的可行性,并分析了褥垫层厚度、褥垫层模量、桩径、桩间距、桩土模量等因素对水泥土搅拌桩复合地基的桩土应力比的影响。研究表明:水泥土搅拌桩复合地基的桩土应力比随褥垫层厚度、桩间土压缩模量的增大而减小,随褥垫层模量、桩间距、桩体弹性模量的增大而增大,随桩径的增加先增大后减小;桩土面积置换率对桩土应力比的影响不是唯一单调关系,受桩径与桩间距共同影响。最后,根据桩土应力比设计指标对该计算方法反演得出水泥土搅拌桩复合地基褥垫层的柔度系数值,结合地区经验对褥垫层厚度进行了优化设计。

关键词： 复合地基; 水泥土搅拌桩; 负摩阻力; 桩土应力比; 临界桩长; 褥垫层

本文引用格式

刘光秀 , 党发宁 , 马小莉 , 李玉根 . 水泥土搅拌桩复合地基桩土应力比计算与垫层优化[J]. 地下空间与工程学报, 2025 , 21(4) : 1373 -1383 . DOI: 10.20174/j.JUSE.2025.04.29

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

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