盾构法联络通道施工中因洞口处临时管片难以切削,施工中存在掘进周期长、盾机姿态难控制、涌水涌砂风险高等问题,但是关于此问题解决方案的研究目前还很缺乏。因此,本文以天津某地铁盾构法联络通道项目为背景,在保证结构施工及使用期间安全性的基础上,从弱化临时管片的角度出发,提出了3种弱化方式,分别为降低待切管片砼强度等级、减少玻璃纤维筋布筋量以及管片打孔,并利用有限元数值模拟对弱化的可能性及影响进行了研究。结果表明:(1)在3种弱化方式下,特殊衬砌环内力变化规律均为切削区内力减小,钢管片区内力增大,普通衬砌环的内力小幅度提高;(2)临时管片砼强度由C40降到C20后对衬砌环内力影响在15%以内,其中钢管片区内力增加量在5%以内;(3)主筋量减少70%以内对管片内力影响在2 %以内;(4)管片内侧打孔使切削区弯矩降低30%左右,孔径与孔深尺寸相同变化量情况下,孔径对于内力影响大于孔深;(5)不同弱化方式弱化后的结构内力均在极限承载范围之内,3种弱化方式均可采用,从施工便利性和安全性角度来看,临时管片砼强度降低方案为最优方案。
Due to the difficulty of cutting the temporary segment at the mouth of the tunnel in the construction of shield tunneling method, there are some problems in the construction, such as long tunneling period, difficult to control the attitude of shield machine, and high risk of water and sand gushing. However, there is still a lack of research on the solutions to these problems. Therefore, based on the background of the shield tunnel project of a subway in Tianjin, on the basis of ensuring the safety of the structure during construction and use, this paper proposes three weakening methods from the perspective of weakening the temporary segment, which are to reduce the concrete strength grade of the segment to be cut, reduce the amount of glass fiber reinforcement and drilling the segment. The possibility and influence of weakening were studied by finite element numerical simulation. The results show that: (1) Under the three weakening methods, the internal forces of the special lining ring are decreased in the cutting area, the internal forces of the steel tube area are increased, and the internal forces of the ordinary lining ring are slightly increased. (2) After the temporary segment concrete strength is reduced from C40 to C20, the internal force of the lining ring is affected within 15%, and the internal force of the steel pipe area is increased within 5%. (3) the influence of the main reinforcement amount on the internal force of the segment within 2% is less than 70%. (4) Drilling inside the segment reduces the bending moment of the cutting area by about 30%. Under the same variation of the size of the aperture and the hole depth, the influence of the aperture on the internal force is greater than the hole depth. (5) The structural internal forces weakened by different weakening methods are all within the limit bearing range, and all the three weakening methods can be adopted. From the perspective of construction convenience and safety, the concrete strength reduction scheme of temporary segment is the optimal scheme.
[1]王昆, 叶蕾, 程永龙,等. 机械法联络通道用掘进机始发接收密封装置研究[J]. 隧道建设(中英文), 2020, 40(1): 134-142. (Wang Kun, Ye Lei, Cheng Yonglong, et al. Study on the initial receiving seal device of roadheader for mechanical connection Channel[J]. Tunnelling Construction, 2020, 40(1): 134-142. (in Chinese))
[2]朱瑶宏,董子博,尹铁锋,等. 地下空间联络通道微加固机械法T接技术探索[A]// 中国土木工程学会编. 中国土木工程学会2017年学术年会论文集[C]. 上海: 中国城市出版社,2017: 138-147. (Zhu Yaohong, Dong Zibo, Yin Tiefeng, et al. Exploration of mechanical T-Joint technology for micro-reinforcement of underground space connecting passage [A]// China Civil Engineering Society[A]// Proceedings of the 2017 Annual Conference of China Civil Engineering Society[C]. Shanghai: China City Press, 2017:138-147. (in Chinese))
[3]朱瑶宏, 高一民, 董子博,等. 顶管法T接隧道结构受力足尺试验研究[J]. 隧道建设(中英文), 2019, 39(9):1392-1401.( Zhu Yaohong, Gao Yimin, Dong Zibo, et al. Experimental study on stress of T-joint tunnel with pipe jacking method [J]. Tunnel Construction, 2019, 39(9):1392-1401. (in Chinese))
[4]孙烨,刘明高,陆平,等. 盾构隧道横向联络通道建设关键技术问题综述[J]. 现代隧道技术,2021,58(增1): 293-302. (Sun Ye, Liu Minggao, Lu Ping, et al. Summary of key technical problems in transverse contact passage construction of shield tunnel [J]. Modern Tunnel Technology, 2021, 58(Supp.1): 293-302. (in Chinese))
[5]张迪,焦齐柱,徐意智,等. 地震作用下盾构隧道横通道对主隧道的影响分析[J].地下空间与工程学报,2014, 10(5): 1584-1589.( Zhang Di, Jiao Qizhu, Xu Yizhi, et al. Influence of transverse passage of shield tunnel on main tunnel under earthquake action [J]. Chinese Journal of Underground Space and Engineering, 2014,10(5): 1584-1589. (in Chinese))
[6]朱瑶宏,高一民,董子博,等.盾构法T接隧道结构受力足尺试验研究[J].隧道建设(中英文),2020,40(1):9-18. ( Zhu Yaohong, Gao Yimin, Dong Zibo, et al. Experimental study on force force of T-joint tunnel with shield method [J]. Tunnel Construction, 2020,40 (1):9-18. (in Chinese))
[7]柳献,高一民,张姣龙,等. 机械法联络通道施工中主隧道的破洞响应分析[J]. 岩土工程学报,2020,42(5):951-960. (Liu Xian, Gao Yimin, Zhang Jiaolong, et al. Analysis of tunnel rupture response of main tunnel in mechanical connection tunnel construction [J].Chinese Journal of Geotechnical Engineering, 2020,42 (5):951-960. (in Chinese))
[8]吴文涛,张恒,李海清.地铁联络通道施工力学特性分析[J].铁道建筑,2011(11):65-68. (Wu Wentao, Zhang Heng, Li Haiqing. Analysis of mechanical characteristics of subway connection passage construction [J]. Railway Construction, 2011(11):65-68. (in Chinese))
[9]丁修恒.半套筒洞门密封技术在盾构联络通道始发中的应用[J].建筑施工,2019,41(5): 919-921.(Ding Xiuheng. Application of semi-sleeve door sealing technology in the initiation of shield connecting Passage [J]. Building Construction, 2019,41(5): 919-921. (in Chinese))
[10]刘明高,马连友,陆平,等.超大直径盾构隧道机械法施工联络通道结构力学响应分析[J].特种结构,2021,38(5): 106-111. (Liu Minggao, Ma Lianyou, Lu Ping, et al. Structural mechanical response analysis of super large diameter shield tunnel connection tunnel constructed by mechanical method[J]. Special Structures, 2021, 38(5):106-111. (in Chinese))
[11]黄毅,刘正好,马险峰,等.机械法联络通道管片切削试验与数值模拟研究[J].隧道建设(中英文),2022,42(增1):93-103.(Huang Yi, Liu Zhenghao, Ma Xianfeng,et al. Experimental study and numerical simulation of mechanical connection channel segment cutting [J]. Tunnel Construction,2022,42(Supp.1):93-103. (in Chinese))
[12]丁剑敏, 董子博, 莫振泽, 等. 顶管法T 接隧道现场试验研究分析[ J]. 隧道建设(中英文), 2020, 40(1): 28-34. (Ding Jianmin, Dong Zibo, Mo Zhenze, et al. Field test research and analysis of T-joint tunnel with pipe jacking method [J]. Tunnel Construction,2020, 40(1):28-34. (in Chinese))
[13]张稳军,朱战魁,李瑶,等.冲蚀空洞对埋地供水管道力学性能的影响研究[J].隧道与地下工程灾害防治,2020,2(3): 36-47. (Zhang Wenjun, Zhu Zhankui, Li Yao, et al. Influence of erosion cavity on mechanical properties of buried water supply pipeline [J].Disaster Prevention and Control of Tunnel and Underground Engineering, 2020,2 (3): 36-47. (in Chinese))
[14]小泉淳.盾构隧道管片设计——从容许应力设计法到极限状态设计法[M].北京:中国建筑出版社,2012.(Koizumi Chun. Shield tunnel segment design: from admissible stress design method to limit state design method [M]. Beijing: China Architecture Press, 2012. (in Chinese))
