高填土软土桩基堤防加固的三维数值分析  

3D Numerical Analysis of Pile Foundation Embankment Reinforcement in High Fill Soft Soil Foundation

作　　者：王政平[1] 湛杰 贾东远 WANG Zhengping;ZHAN Jie;JIA Dongyuan(China Water Resources Pearl River Planning Surveying&Designing Co.,Ltd.,Guangzhou 510610,China)

机构地区：[1]中水珠江规划勘测设计有限公司,广东广州510610

出　　处：《人民黄河》2020年第10期54-59,共6页Yellow River

基　　金：2018年广州市天河区科技计划项目(20180Y001)。

摘　　要：为明确高填土软土桩基堤防变位机理,提出合适的加固方案,以梧州河东堤西江段为背景,对堤防及其基础进行数值分析。考虑超孔隙水压力,运用防洪堤-桩-地基三维流固耦合数值法,对参数进行敏感性分析和反演,发现堤防小变位时其变位由变形模量主导,大变位时由抗剪强度主导;地基参数建议值存在一定的富余;洪水漫顶时,堤防主体结构仍安全,但存在大应变区;各排桩受力存在较大差异;根据大应变区分布,提出充填灌浆加固方案;在设计洪水位时,加固后堤防变位减小显著,结构强度满足规范要求,表明加固方案有效可行。研究表明,数值分析是复杂堤防变位分析的有效手段,分析方法和加固方案可为类似工程提供参考。In order to clarify the mechanism of embankment displacement of high⁃fill soft soil pile foundation,a suitable reinforcement scheme was proposed,based on the Xijiang section of the east embankment of Wuzhou River,the numerical analysis of the embankment and its foun⁃dation was carried out.Taking the pressure of excess pore water into account,the sensitivity analysis and inversion of the parameters were carried out by using the three⁃dimensional fluid⁃solid coupling numerical method of“levee⁃pile⁃foundation”.It found out that the variation of embankment was dominated by deformation modulus and shear strength when it was large.The suggested value of ground parameter had cer⁃tain surplus.When the flood overtops,the main structure of the embankment was still safe,but there was a large strain zone.There were great differences in the forces of each pile row.According to the distribution of plastic area,the reinforcement scheme of filling and grouting was proposed.When the flood level was designed,the dike displacement after reinforcement was reduced and the structural strength met the standard requirements,which indicated that the reinforcement scheme was effective and feasible.It is shown that numerical analysis is an ef⁃fective method to analyze the displacement of complex dyke.

关 键 词：高填土 桩基 堤防 加固 变位 数值分析 

分 类 号：TV22[水利工程—水工结构工程] TV87