Influences of Train Vibration on Integrated Assembled Internal Structures of Shield Tunnels Foundations on Cavities
-
摘要: 盾构隧道内部结构的全预制化对于提高施工工效、保障建造质量具有重要意义。然而,由于装配构件的连接强度和质量存在差异,在隧底存在注浆空洞时铁路列车通行引起的振动响应将对装配式内部结构的受力和变形造成不利影响。以甬舟铁路金塘海底隧道为背景,提出全拼装内部结构与管片的两种连接方式(两端固接,一端固接一端水平铰接)及非封闭二衬部分拼装式内部结构,并对不同内部结构形式在列车振动下基底空洞对其基底累积沉降及内力的影响进行研究。研究表明:1)基底空洞导致基底累积沉降增大,但全装配式内部结构与管片在两端固接时盾构隧道累积沉降最小,表明内部结构与管片连接的加强能减小列车往复荷载作用下的累积变形;2)基底空洞会造成管片和结构内力的增大,造成该区域衬砌应力集中,阻碍振动能量往管片传递,造成全装配式内部结构的连接螺栓剪力幅值激增,并引起隧道拱底振动能量积聚,使振动的累积响应加剧。Abstract: The integrated prefabrication for internal structures of shield tunnels is of great significance to improve construction efficiency and guarantee construction quality. However, due to the difference in connection strength and quality of assembled components, the vibration response caused by the passage of trains on shield tunnel foundations on cavities will have negative effect on the force and deformation of the assembled internal structure. Against the background of Jintang Submarine Tunnel of Yongzhou Railway, two connection methods (fixed at both ends, fixed at one end and horizontally hinged at the other end) of integrated assembled internal structures with shield segments and partially assembled internal structures with unclosedly secondary linings were proposed, the influence of cavities in foundation under different internal structures on the cumulatively basal settlement and internal forces under vibration in operation of trains was studied. The research indicated that: 1) Cavities under foundations would increase the cumuletively basal settlement, but the cumulatively basal settlement of the integrated assembled internal structure fixed with shield segments at both ends was minimum, it showed that the strengthening of the connection between the internal structure and the segments could reduce cumulative deformation under reciprocating loads by trains; 2) Cavities under founndations would increase internal forces in shield segments and internal structures, and produce stress concentration in the lining in the corresponding area. Cavities would hinder transfer of vibration energy to segments, resulting in the sharp increase of shear amplitude in connecting bolts in the integrated assembled internal structure and the accumulation of vibration energy at the arch bottom, which would intensify the cumulative response of vibration.
-
[1] 何川,封坤.大型水下盾构隧道结构研究现状与展望[J].西南交通大学学报, 2011, 46(1):1-11. [2] 王德超,王国富,乔南,等.预制装配式结构在地下工程中的应用及前景分析[J].中国科技论文,2018,13(1):115-120. [3] 赵勇,吕刚,刘建友,等.京张高铁清华园隧道建造关键技术创新与应用[J].铁道标准设计,2020,64(1):109-115,136. [4] 吕刚,刘建友,赵勇,等.京张高铁清华园隧道轨下结构预制拼装技术[J].隧道建设(中英文),2019,39(8):1357-1364. [5] 姬杨蓓蓓.上海诸光路地下通道预制拼装施工方案设计和工程难点分析[J].建筑施工,2019,41(4):672-675. [6] 赖金星,刘炽,胡昭,等.盾构隧道衬砌背后空洞对结构影响规律数值分析[J].现代隧道技术,2017,54(3):126-134. [7] 李亮,张丙强,杨小礼.高速列车振动荷载下大断面隧道结构动力响应分析[J].岩石力学与工程学报,2005(23):4259-4265. [8] 潘昌实,谢正光.地铁区间隧道列车振动测试与分析[J].土木工程学报,1990(2):21-28. [9] 徐鹏.列车-轨道-路基耦合振动及地震条件下行车安全性分析[D].成都:西南交通大学,2012. [10] YANG Y B, HUNG H H. Train-induced wave propagation in layered soils using finite/infinite element simulation[J]. Soil Dynamics&Earthquake Engineering, 2003, 23(4):263-278. [11] 王爱武,蒋超,戴志成,等.复杂地质大直径盾构隧道列车振动响应分析[J].铁道标准设计,2019,63(8):114-119. [12] 陈松洁.软弱地层中水下高速铁路盾构隧道列车振动响应分析[D].长沙:中南大学, 2010. [13] 施成华,雷明锋,彭立敏,等.砂层隧道列车振动响应与地基累积变形研究[J].铁道学报, 2011, 33(7):118-124. [14] PUPPALA A J, MOHAMMAD L N, ALLEN A. Permanent Deformation Characterization of Subgrade Soils from RLT Test[J]. Journal of Materials in Civil Engineering, 1999, 11(4):274-282. [15] LI D Q, SELIG E T. Cumulative plastic deformation for fine-grained subgrade soils[J]. Journal of Geotechnical Engineering, 1996, 122(12):1006-1013. [16] CHAI J C, MIURA N. Traffic-load-induced permanent deformation of road on soft subsoil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002, 128(11):907-916. [17] 中华人民共和国铁道部.客运专线无碴轨道铁路设计指南:铁建设函[2005] 754号[S].北京:中国铁道出版社,2005. [18] 潘文韬,肖明清,封坤,等.软弱围岩下海底铁路盾构隧道全装配式内部结构列车振动响应研究[J].铁道标准设计,2022,66(3):130-137.
点击查看大图
计量
- 文章访问数: 94
- HTML全文浏览量: 13
- PDF下载量: 8
- 被引次数: 0