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袁齊虎1, 張坤勇2 , 3, 張興其4, 張夢3, 沈小銳3

(1. 中鐵四局集團(tuán)第四工程有限公司，安徽 合肥 230041 ; 

2. 河海大學(xué) 巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室，江蘇 南京 210024 ; 

3. 河海大學(xué) 巖土工程科學(xué)研究所，江蘇 南京 210024 ;

4. 合肥市市政設(shè)計(jì)研究總院有限公司，安徽 合肥 230041)

摘 要 ：在城市交通快速發(fā)展的情況下，大斷面淺埋式立交通道已日益增多，采用管幕箱涵法施工有著獨(dú)特的優(yōu)勢。以某管幕箱涵工程為背景，基于頂推力計(jì)算結(jié)果，選取關(guān)鍵監(jiān)測斷面，針對關(guān)鍵施工節(jié)點(diǎn)，建立有限元模型，對現(xiàn)有頂進(jìn)方案進(jìn)行模擬，分析管幕箱涵頂進(jìn)引起的地表沉降變形。對修正劍橋模型中離散較大的參數(shù)進(jìn)行參數(shù)敏感性分析，得到對土體變形影響較大的參數(shù)作為待反演參數(shù)。設(shè)計(jì)25組正交試驗(yàn)土體參數(shù)，并代入二維模型進(jìn)行計(jì)算，構(gòu)建訓(xùn)練數(shù)據(jù)。根據(jù)地表沉降監(jiān)測數(shù)據(jù)，利用ISSA- ELM網(wǎng)絡(luò)模型反演得到五個工況下的土體參數(shù)，并代入有限元模型中進(jìn)行重新計(jì)算，實(shí)現(xiàn)對后續(xù)工況的變形預(yù)測。結(jié)果表明：本文方法符合工程實(shí)際規(guī)律，對類似工程有較好的參考價(jià)值；基于智能算法提出參數(shù)反演和變形預(yù)測方法得到的沉降最大值和最大值所處位置均比初始參數(shù)值結(jié)果更接近監(jiān)測值，說明進(jìn)行參數(shù)反演具有實(shí)際意義和使用價(jià)值。

關(guān)鍵詞：管幕箱涵 ；頂推力 ；有限元 ；敏感性分析 ；變形預(yù)測

中圖分類號：TU43 

文獻(xiàn)標(biāo)志碼：A 

文章編號：1005- 8249 (2024) 03- 0061- 07 

DOI：10.19860/j.cnki.issn1005-8249.2024.03.013

YUAN Qihu1, ZHANG Kunyong2 , 3, ZHANG Xingqi4, ZHANG Meng3 , SHEN Xiaorui3

1. The Fourth Engineering Co. ，LTD. Of Ctce Group , Hefei 230041 , China; 

2. Key Laboratory of Geotechnical and Dam Engineering of Ministry of Education, Hohai University, Nanjing 210024, China;

3. Institute of Geotechnical Engineering , Hohai University , Nanjing 210024 , China;

4. Hefei Municipal Design and Research Institute Co. ，Ltd. ，Hefei 230041 , China

Abstract : Under the condition of the rapid development of urban traffic , the large section shallow buried underpass has been increasing day by day , the use of tube curtain box culvert construction has a unique advantage. In this paper , a curtain box culvert project is taken as the background , key monitoring sections are selected based on the jacking thrust calculation results , and a finite element model is established for key construction nodes to simulate the existing jacking scheme and analyze the surface settlement deformation caused by the jacking of curtain box culverts. Based on the sensitivity analysis of the parameters with large dispersion in the modified Cambridge model , the parameters with large influence on soil deformation are obtained as the parameters to be inverted. 25 groups of orthogonal test soil parameters were designed and substituted into a two - dimensional model to construct the training data. According to the surface settlement monitoring data , soil parameters under five working conditions were obtained by using ISA - ELM network model inversion , and then recalculated into the finite element model to achieve deformation prediction under subsequent working conditions. The results show that the calculation method proposed in this paper is in line with the actual law of the project , and has a good reference value for similar projects; the locations of the maximum settlement and maximum value obtained by the proposed parameter inversion and deformation prediction method based on intelligent algorithm are closer to the monitoring value than the initial parameter value , which indicates that the parameter inversion has practical significance and value of use .

Keywords : curtain box culvert; top thrust; finite element; sensitivity analysis; deformation prediction

作者簡介：袁齊虎 (1988—) , 男 ，本科 ，高級工程師 ，研究方向：地下隧道頂進(jìn)施工研究。

收稿日期：2023- 04- 19