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段志远¹  ,  李德晟¹  ,   薛    泽¹  ,  陈俊昂² ,  梁庆华³

 

( 1 .  河海大学 土木与交通学院 ，江苏 南京 210024 ;  2.  广东省水利电力勘测设计研究院有限公司，

广东 广州 510000 ;  3 .  广东省南沙区水务局 ，广东 广州 510000)

摘   要 ：采用水泥搅拌桩联合排水预压法对滨海地区软土地基进行加固处理，通过 PLAXIS 3D 有限元软件对该方法的加固效果进行数值模拟，模拟分析临水或临空条件下地基的沉降与水平位移，以及软基深度 、土体扰动对地基稳定性的影响。结果表明：水泥搅拌桩联合排水预压法能够有效降低施工期间及施工后的沉降量， 并显著提升地基的抗变形能力和稳定性，特别是在潮汐作用下，该方法能有效控制不均匀沉降，减小路基一侧的下沉和临水一侧的隆起，抵抗土体扰动；当软基深度较大时，地基的沉降影响范围显著增加，但经过长时间的固结处理，沉降值显著减小。研究结果可为滨海软基处理提供了重要的理论依据和技术参考。

关键词：水泥搅拌桩；排水预压；有限元模拟；沉降；水平位移

中图分类号：TU470           

文献标志码：A            

文章编号： 1005- 8249   (2024)  05- 0043- 07

 DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05 .009

 

DUAN Zhiyuan¹,  LI Desheng¹,  XUE Ze¹  ,   CHEN Jun ’ang² ,  LIANG Qinghua³

（1 . College of Civil and Transportation,  Hohai University, Nanjing 210024, China;

2. Guangdong Hydropower Planning & Design Institute co. ，Ltd. ，Guangzhou 510000 ,  China;

3 . Nansha Water Affairs Bureau Guangdong Provincial ,  Guangzhou 510000,  China)

Abstract: In this paper, the cement mixing pile combined with drainage pre-compression method is used to reinforce the soft ground foundation in coastal area, and the numerical simulation of the reinforcement effect of this method is carried out by PLAXIS 3D finite element software, which simulates and analyses the settlement and horizontal displacement of the foundation under the conditions of waterfront or airside, as well as the influence of the depth of the soft foundation and the disturbance of the soil on the stability of the foundation. The study shows that: the cement mixing pile combined with drainage pre-compression method can effectively reduce the settlement during and after construction, and significantly improve the deformation resistance and stability of foundations, especially under tidal action, the method can effectively control the uneven settlement, reduce the subsidence of one side of the roadbed and the bulge of the waterfront side, and resist the soil disturbance: when the depth of the soft foundation is large, the settlement influence range of foundations increases significantly, but after a When the depth of soft foundation is larger, the settlement influence range of foundation increases significantly, but after a long time of consolidation treatment, the settlement value decreases significantly. The results of the study can provide important theoretical basis and technical reference for coastal soft foundation treatment.

Keywords :  cement mixing pile;  drainage pre loading;  finite element modeling;  settlement;  lateral displacement

*基金项目： 国家自然科学基金项目(52178327); 广州市南沙区防洪潮安全系统提升关键技术研究项目（ 穗南水合2022-263) 。 

作者简介：段志远  (2002—) ,  男，本科，硕士研究生，研究方向：软土固化处理。

通信作者： 陈俊昂  (1981 —) ,男，本科，教授级高级工程师，研究方向：水利工程技术研究 、规划设计。 

收稿日期：2024- 02- 28