复杂基坑支撑结构监测点布置优化  

Layout optimization of monitoring points in complex support structure of foundation pit

作　　者：姚冠华 张翾[2] 张鹏 王礼华 史豪杰 YAO Guanhua;ZHANG Xuan;ZHANG Peng;WANG Lihua;SHI Haojie(College of Transportation Engineering,Nanjing Tech University,Nanjing 211800,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China;Nanjing Intelligent Geotechnical Engineering Institute,Nanjing 211800,China;The Fourth Company of CCCC First Highway Engineering Group Co.Ltd.,Nanning 530219,China)

机构地区：[1]南京工业大学交通运输工程学院,江苏南京211800 [2]交通运输部公路科学研究院,北京100088 [3]南京智慧岩土工程技术研究院,江苏南京211800 [4]中交一公局第四工程有限公司,广西南宁530219

出　　处：《南京工业大学学报（自然科学版）》2023年第6期695-703,共9页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：中交一公局集团有限公司科技项目(4GS(J)-GUD-GCL-01-JS-016)。

摘　　要：基坑结构健康监测点的合理布置是准确预测基坑结构变形安全的重要保障。传统监测点等间距布置只适用于结构形式简单的中小基坑,对于复杂的支撑体系,结构、土压力的不对称性对监测点的布置提出了更高要求,因此,复杂基坑结构监测点布置优化对准确预测基坑结构安全至关重要。提出了一种融合模态分析与粒子群算法的复杂基坑支撑结构监测点布置优化方法,首先,在对基坑支撑结构模态分析基础上获取结构模态参数(频率、基本振型);其次,构建基于模态置信度准则(MAC法)的适应度函数,以适应度函数作为优化监测点位置的判别标准;最后,采用粒子群优化算法对全部监测点布置进行全局优化。以南京江北新区某基坑为案例,所提方法的计算结果相比于均匀布设的监测点布置方案更能反映出基坑最危险部位的需要。上述研究可为地下工程健康监测技术提升提供重要的理论指导。Reasonable layout of foundation pit structure health monitoring points is conducive to accurately predict the deformation and to ensure the safety of foundation pit structure.Traditional layout method of monitoring points with equal spacing is applicable for small and medium foundation pits with simple structure.For foundation pits with complex support system,higher requirements are put forward for layout of monitoring points of foundation pit due to asymmetric distribution of structure and soil pressure.Optimizing the layout of monitoring points for complex foundation pit structure is very important for accurately predicting the safety of foundation pit structure.An optimization method for monitoring point layout of complex foundation pit support structure was proposed,which combined modal analysis and particle swarm algorithm.Firstly,the modal analysis was carried out on the support structure of foundation pit to obtain the structural modal parameters(frequency,basic mode),and then the adaptability function based on the modal confidence criterion(MAC method)was constructed as the criterion for optimizing the location of monitoring points.Finally,particle swarm optimization(PSO)was used to optimize the layout of all monitoring points globally.Taking a foundation pit in Jiangbei New Area of Nanjing as an example,the calculation results of the proposed method could better reflect the needs of the most dangerous part of the foundation pit compared with the evenly arranged monitoring point layout scheme.The above research provided important theoretical guidance for the improvement of underground engineering health monitoring technology.

关 键 词：基坑工程 健康监测 模态分析 粒子群算法 优化分析 

分 类 号：U25[交通运输工程—道路与铁道工程]