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胡增輝¹   ,  韓三琪 ¹   ,  龔賢江²

 

 ( 1 .  寧波市軌道交通集團有限公司建設分公司 ，浙江 寧波 315101 ;

2.  寧波國際投資咨詢有限公司 ，浙江 寧波 315040)

摘   要 ：樁板結構施工受到軌道交通下穿施工擾動影響，出現樁身變形 、蓋板豎向變形問題，導致算法泛化能力差的問題。充分考慮軌道交通下穿施工影響，通過多目標優化樁板結構施工參數使其符合實際施工需求。以某地鐵 1 號線實際工程為依托，利用有限元法建立施工模型，模擬動態開挖過程 。建立 GA - LSSVM 與NSGA- II算法相結合的多目標優化函數，以樁板結構施工參數為研究對象，對軌道交通下穿施工造成的樁身變形、蓋板豎向變形為控制目標，進行施工參數優化分析 。通過獲取非支配 Pareto 前沿解集，得到樁板結構施工 參數控制范圍值 。由模型驗證結果可知，該算法最大樁身變形為 0. 8 mm 、最大蓋板豎向變形為 2. 1  mm 能夠使變形量得到有效降低 ，保證結構變形趨于穩定。

關鍵詞 ：軌道交通 ；下穿施工 ；樁板結構 ；施工參數優化

中圖分類號 ：U459. 3           

文獻標志碼 ：A            

文章編號 ：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

作者簡介 ：胡增輝  (1981 —) ,  男 ，博士 ，高級工程師 ，主要研究方向 ：城市軌道交通工程建設管理 、地下工程等。

收稿日期 ：2022- 12-28