基底土体加固对超长深基坑变形的影响及优化分析  

Influence of basement soil reinforcement on deformation of ultra-long deep foundation pit and optimization analysis

作　　者：刘洋[1] 何忠明[1,2] 王利军 王盘盘 LIU Yang;HE Zhongming;WANG Lijun;WANG Panpan(School of Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;National Engineering Research Center of Highway Maintenance Technology,Changsha University of Science&Technology,Changsha 410114,China;Construction Business Headquarters,Guangzhou Metro Group Co.,Ltd.,Guangzhou 510380,China)

机构地区：[1]长沙理工大学交通学院,湖南长沙410114 [2]长沙理工大学公路养护技术国家工程研究中心,湖南长沙410114 [3]广州地铁集团有限公司建设事业总部,广东广州510380

出　　处：《长沙理工大学学报(自然科学版)》2025年第1期101-110,共10页Journal of Changsha University of Science & Technology:Natural Science

基　　金：国家自然科学基金(51978084);广州地铁集团有限公司科研项目(HT200856);长沙理工大学研究生“实践创新与创业能力提升计划”(SJCX2021111)。

摘　　要：【目的】综合考虑基底土体加固的各影响因素对超长深基坑变形的影响,进行加固方案的优化设计。【方法】依托某地铁站基坑项目,采用FLAC3D有限元软件对基坑开挖进行数值模拟,采用正交试验方法综合分析基底土体加固的平面设计形状与加固参数对基坑地下连续墙的侧向位移与基底竖向位移的影响,并分析和确定各因素对上述位移指标的影响效果。【结果】基底土体加固方式的不同平面设计形状对超长深基坑变形影响不同,其中满堂加固方式对基坑变形的控制作用较显著,但裙边加固方式对于控制地连墙的变形也能够发挥很好的作用;不同加固参数对基坑变形影响也不同,对变形的控制效果会随着水泥掺量(质量分数)及加固厚度的增加而变好;基底土体加固平面设计形状对超长深基坑变形控制的影响较大,水泥掺量和加固厚度对超长深基坑变形控制的影响相对较小。在基底土体使用满堂加固方式、水泥掺量在14%~16%和加固厚度在10~12 m时,对基坑变形的控制效果最理想。【结论】在超长深基坑设计时,要考虑基底土体加固方式的平面设计形状,还需要深入考虑在该平面设计形状下加固参数对基坑的影响;在同类型基坑设计时,应优先考虑满堂加固方式的平面设计形状,必要时可适当减小水泥掺量及加固厚度,以提高基坑工程设计的经济合理性。[Purposes]The influence of various influencing factors of basement soil reinforcement on the deformation of ultra-long deep foundation pit was comprehensively considered,and the design of the reinforcement scheme was optimized.[Methods]Based on the foundation pit project of a subway station,FLAC3D finite element software was used to numerically simulate the excavation of the foundation pit,and the orthogonal test method was used to comprehensively analyze the influence of the planar design shape and reinforcement parameters of the basement soil reinforcement on the lateral displacement of the underground continuous wall and the vertical displacement of the foundation pit.In addition,the influence of various factors on the above displacement indexes was analyzed and determined.[Findings]The different plane design shapes of the basement soil reinforcement have different effects on the deformation of the ultra-long deep foundation pit,and the reinforcement method of the entire basement soil has a significant control effect on the deformation of the foundation pit.The reinforcement method along the diaphragm wall can also play a good role in controlling the deformation of the diaphragm wall.Different reinforcement parameters have different effects on foundation pit deformation,and the deformation control effect gets better with the increase in cement content and reinforcement thickness.The plane design shape of the basement soil reinforcement has a great influence on the deformation control of the ultra-long deep foundation pit,and the reinforcement thickness and cement content have relatively little influence on the deformation control of the ultra-long deep foundation pit.The control effect on the deformation of the foundation pit is the most ideal when the reinforcement method of the entire basement soil is used with a cement content of 14%-16%and reinforcement thickness of 10-12 m.[Conclusions]In the design of an ultra-long deep foundation pit,the plane design shape of the basement soil reinforcement should be co

关 键 词：基坑开挖 基底土体加固 数值模拟 基坑变形 优化分析 

分 类 号：TV551.4[水利工程—水利水电工程] TU470.3[建筑科学—结构工程]