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胡增辉¹   ,  韩三琪 ¹   ,  龚贤江²

 

 ( 1 .  宁波市轨道交通集团有限公司建设分公司 ，浙江 宁波 315101 ;

2.  宁波国际投资咨询有限公司 ，浙江 宁波 315040)

摘   要 ：桩板结构施工受到轨道交通下穿施工扰动影响，出现桩身变形 、盖板竖向变形问题，导致算法泛化能力差的问题。充分考虑轨道交通下穿施工影响，通过多目标优化桩板结构施工参数使其符合实际施工需求。以某地铁 1 号线实际工程为依托，利用有限元法建立施工模型，模拟动态开挖过程 。建立 GA - LSSVM 与NSGA- II算法相结合的多目标优化函数，以桩板结构施工参数为研究对象，对轨道交通下穿施工造成的桩身变形、盖板竖向变形为控制目标，进行施工参数优化分析 。通过获取非支配 Pareto 前沿解集，得到桩板结构施工 参数控制范围值 。由模型验证结果可知，该算法最大桩身变形为 0. 8 mm 、最大盖板竖向变形为 2. 1  mm 能够使变形量得到有效降低 ，保证结构变形趋于稳定。

关键词 ：轨道交通 ；下穿施工 ；桩板结构 ；施工参数优化

中图分类号 ：U459. 3           

文献标志码 ：A            

文章编号 ：1005- 8249  (2023)   05- 0126- 07

 DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 05 . 020

HU Zenghui ¹  ,   HAN Sanqi ¹  ,   Gong Xianjiang²

( 1 . Ningbo Rail Transit Group Co. ，Ltd. ，Construction Branch ,   Ningbo 315101 ,   China;

2. Ningbo International Investment Consulting Co. ，Ltd. ，Ningbo 315000 ,   China)

Abstract: The construction of pile plate structure is disturbed by the underpass construction of rail transit, which leads to the problems of pile body deformation and vertical deformation of cover plate, resulting in poor generalization ability of the algorithm. Fully considering the impact of rail transit underpass construction, the construction parameters of pile slab structure are optimized through multi-objective to meet the actual construction requirements. Based on the actual project of a metro line 1, the construction model is established by using the finite element method to simulate the dynamic excavation process. A multi-objective optimization function combining GA-LSSVM and NSGA II algorithm is established. Taking the construction parameters of pile slab structure as the research object, the construction parameters are optimized and analyzed for the control objectives of the pile body deformation and the vertical deformation of cover plate caused by the underpass construction of rail transit. By obtaining the non dominated Pareto frontier solution set, the control range values of the construction parameters of the pile plate structure are obtained. From the model verification results, it can be seen that the maximum pile shaft deformation of the algorithm is 0.8mm, and the maximum vertical deformation of the cover plate is 2.1mm, which can effectively reduce the deformation and ensure that the structural deformation tends to be stable.

Keywords: rail transit; undercrossing construction; pile plate structure; optimization of construction parameters

作者简介 ：胡增辉  (1981 —) ,  男 ，博士 ，高级工程师 ，主要研究方向 ：城市轨道交通工程建设管理 、地下工程等。

收稿日期 ：2022- 12-28