基坑开挖对珠江堤防安全影响分析

广州轨道交通某中间风井位于珠江前航道管理范围内.为确保堤防安全,首先建立考虑多土层的土体参数随机场模型,其次建立基坑开挖的二维和三维有限元模型,研究基坑开挖前后堤防结构应力与变形变化情况,最后采用蒙特卡罗方法对堤防结构的变形进行概率统计分析.结果表明,基坑开挖后,堤防结构应力略微增加,堤顶竖直位移在2.5 mm内,变异...

Analysis of the Impact of Construction of Foundation Pit on the Safety of the Pearl River Embankment

A middle air shaft of Guangzhou Metro is located within the management scope of the Pearl River Front Channel.For the safety of river embankment,firstly,a random field model of soil parameters considering multiple soil layers is established.Secondly,establish a 2D and 3D finite element model of foundation pit excavation is established to analyze the stress and deformation changes of the embankment structure before and after excavation.Finally,the Monte Carlo method is used to analyze the probability and statistics of the deformation of the river embankment structure.The calculation results show that,after the excavation of the foundation pit,the stress of the dike structure increases slightly,the vertical displacement of the top of the dike is within 2.5mm,and the coefficient of variation is 4.7%,which is consistent with the actual monitoring results.These analysis results play a certain role for the supervision of the river project.