渗流作用对预应力鱼腹梁深基坑受力与变形的影响  

Influence of seepage on stress and deformation of deep foundation pit of prestressed fish-belly beam

作　　者：赵延林 朱利华 曹岩 王可 Zhao Yanlin;Zhu Lihua;Cao Yan;Wang Ke(School of Archiecture&Civil Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)

机构地区：[1]黑龙江科技大学建筑工程学院,哈尔滨150022

出　　处：《黑龙江科技大学学报》2025年第1期123-130,146,共9页Journal of Heilongjiang University of Science And Technology

摘　　要：为研究渗流对预应力鱼腹梁深基坑受力与变形的影响,结合实际工程监测数据,应用Midas GTS建立基于流固耦合理论的预应力鱼腹梁深基坑降水开挖三维数值模型,分析了渗流对预应力鱼腹梁深基坑受力与变形的影响。结果表明:渗流对基坑变形及围护桩与鱼腹梁支撑体系的受力影响均较显著,其中,周边地表沉降受渗流影响最大,围护桩变形与坑底隆起变形受渗流影响较大,围护桩与鱼腹梁支撑体系内力受渗流影响相对较小;渗流使周边地表最大沉降增加71.6%,沉降范围增加1倍以上,对渗流影响最为敏感的区域为距基坑边缘1.3 H以外的地表;渗流使支护桩最大水平位移与坑底最大隆起位移分别增加36.8%与22.8%;渗流对上层角撑与对撑轴力的影响较小,对下层角撑与对撑轴力及围护桩弯矩的影响相对较大,平均增幅约为10%。This paper is intended to investigate the influence of seepage on the stress and deformation of deep foundation pit of prestressed fish-belly beam.The study is accomplished by establishing a three-dimensional numerical analysis model of dewatering excavation of deep foundation pit of prestressed fish-belly beam based on fluid-solid coupling theory by using Midas GTS in combination with actual engineering monitoring data,and simulating and analyzing the influence law behind seepage on the stress and deformation of deep foundation pit of prestressed fish-belly beam.The results show that the seepage has a significant effect on the deformation of foundation pit and the stress of the retaining pile and fish-belly beam support system,among which the surrounding surface settlement is affected most by seepage,the deformation of the retaining pile and the uplift of the pit bottom is affected more by seepage,and the internal force of the retaining pile and fish-belly beam support system is affected relatively little.The seepage increases the maximum surface settlement by 71.6%,the settlement range more than 1 times,and the most sensitive area to seepage is the surface beyond 1.3 H from the edge of foundation pit.The maximum horizontal displacement of the supporting pile and the maximum uplift displacement of the pit bottom increase by 36.8%and 22.8%,respectively.The seepage has little effect on the upper corner brace and the opposite axial force,while the lower corner brace and the opposite axial force and the bending moment of the retaining pile,with an average increase of about 10%.

关 键 词：预应力鱼腹梁 深基坑 渗流作用 

分 类 号：TU445[建筑科学—岩土工程]