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吴佳应^1,2 , 吴跃东^1,2 , 刘     坚^1,2 , 张哲成^1,2 , 张文慧^1,2

 

(1. 河海大学 岩土力学与堤坝工程教育部重点实验室 , 南京   210098;

2. 河海大学 岩土工程学研究所 , 南京   210098)

摘  要: 针对真空联合堆载预压法加固软土地基时侧向变形预测的难题 , 依托粤东城际铁路莲塘动车所路基工程 , 通过现场监测 、数值模拟与理论推导相结合的方法 , 系统研究侧向变形演化规律并提出量化计算方法。结果表明 : 加固区外土体侧向位移呈" 浅层集中 、深层衰减" 特征 , 最大值 120. 22 mm (0. 5 m 深度) , 水平影响范围 30 m, 深度影响范围 8 m; 堆载阶段产生向加固区外的反向位移 , 与真空收缩位移形成耦合效应 。基于单井轴对称固结理论 , 考虑真空度线性衰减特性 , 推导了真空与堆载分别作用及耦合作用下的侧向位移解析解 ,建立了适用于任意时刻 、任意深度的侧向变形计算方法 。工程验证表明 : 该方法计算值与现场监测值 、数值模拟值相对误差均小于 27% , 能反映复合荷载下的侧向变形规律 。研究成果为软土地基联合预压工程的变形控制及邻近构筑物保护提供了理论依据与技术支撑。

关键词: 真空堆载联合预压 ; 软土地基 ; 侧向变形 ; 解析解 ; 计算方法

中图分类号: TU47      文献标志码: A      文章编号: 1005-8249 (2026) 05-0071-08

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 05. 011

 

WU Jiaying^1,2 , WU Yuedong^1,2 , LIU Jian^1,2 , ZHANG Zhecheng^1,2 , ZHANG Wenhui^1,2

(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,

Hohai University, Nanjing 210098, China;

2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China)

Abstract : Aiming at the problem of lateral deformation prediction when reinforcing soft soil foundation by vacuum combined stacking preloading method, relying on the roadbed project of Liantang EMU of the East Guangdong Intercity Railway, the evolution law of lateral deformation is systematically studied and quantitative calculation methods are proposed through the combination of on - site monitoring, numerical simulation and theoretical derivation.  The results  show that the lateral displacement of the soil outside the reinforcement area is characterized by " shallow concentration and deep attenuation" , with a maximum value of 120. 22mm (0. 5m depth) , a horizontal influence range of 30m, and a depth influence range of 8m. The reverse displacement outside the reinforcement area occurs in the stacking stage, forming a coupling effect with the vacuum shrinkage displacement.  Based on the axisymmetric consolidation theory of a single well, considering the linear attenuation  characteristics of vacuum degree, the analytical solution of lateral displacement under the action and coupling effect of vacuum and stockpile is derived, and a lateral deformation calculation method suitable for any time and depth is established.  The engineering verification shows that the relative error between the calculated value of the method and the field monitoring value and the numerical simulation value is less than 27% , which can reflect the lateral deformation law under compound load.  The research results provide theoretical basis and technical support for the deformation control and protection of adjacent structures in the joint precompaction project of soft soil foundation.

Key words: vacuum  stacking  combined  preloading;  soft  soil  foundation;  lateral deformation;  analytical solution; calculation methods

项目来源 : 国家自然科学基金资助项目 (51608152)。

作者简介 : 吴佳应 (2001—) , 男, 硕士研究生, 研究方向 : 岩土工程软基处理研究。

通信作者 : 吴跃东 (1969—) , 男, 博士, 教授, 研究方向 : 软基处理与基础工程和岩土工程测试技术。

收稿日期 : 2026-05-27