579869

Research Article Fracture and Delamination Assessment of Prestressed Composite Concrete for Use with Pipe Jacking Method Qing Gong, 1 Heh ua Zhu , 1,2 Zhi guo Yan , 1,2 Boq i Hua ng, 1 Yao Zhang, 1 and Ze yu Dong 1 Department o Geotech nical Engineering, Civil Engineering College, ongji University , Shanghai , China State Key Laboratory or Disaster Deduction in Civil Engineering, ongji University , Shanghai , China Correspondence should be addressed to Hehua Zhu; [email protected] Received January ; Accepted April Academic Editor: imon Rabczuk Copyright © Qing Gong et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproductio n in any medium, provided the original work is properly cited. Prestressed composite concrete pipe (PCCP) has been widely used in water-transmission line and has been proven with many advantages over pure concrete or steel pipes, such as high perormance with relatively low cost or materials as well as simplied ins tal la tio n andcons tructi on pr ocess.Recent eﬀort s hav e bee n made to ena ble the PCCP structure sui tab le or pi pe jac kin g met hod so as to rep lac e the conventio nal cutand cover met hod . In thi s wa y , the cons truction time, dis tur ban ce to nea rbystruct ures, and the cos t can be great ly red uce d. In thi s pa per, we pr esent the ul l-sc ale exp eri men tal and numeri cal st udi es o PCCP andthe eva lua tio n o ra ctu re and delami na tio n behaviour o thestructure whe n it is use d wit h pipe jac kin g const ruc tio n met hod subjectedto var iou s jacking orces and ground condi tions. 1. Introduction Prestressed concrete cylinder pipe (PCCP) has been widely use d in water -tr ans mis sion lin e and has pro ven to ha ve many advantages such as high perormance price ratio and con venie nt installatio n process. PCCP also prov ides high bearing capacity, long durability, and resistance to corrosion and leakag e. Te totalleng th o PCCP li nes inst al ledin Nor th Americ a is estimat ed to be , km [ ]. And two types o PCCP, Embedded Cylinder Pipe and Lined Cylinder Pipe, have been applied since the rst application in US in the s [, ]. Research has been carried out on the operational condition assessment o PCCP with statistical analysis [ , – ], experiments [, ], and numerical modeling [ , ]. Tese st udies ha ve shown thatPCCP ha ve low lev el s o da mage and low distress rate as compared to conventional concrete pipes. Te cut and cove r method is mostl y used in PCCP construction. Recently, PCCP structure has been attempted to be use d wit h pipe-j ack ing con str uctionmet hod , or exa mpl e, the wate r-in take pro ject at Langs han Mou ntain, Nan tong city , China. In that project, the pipe has an internal diameter o mm and the total jac king lengt h was m. Compared wit h ste el pipe or other jacking pipes, PCCP used as a jacking pipe structure has many advantages , namely , (a) lower cost that PCCP has a much lower steel consumption than steel pipe; (b) aster construction that the spigot and socket structure as well as the exible docking simpliy the constr uct ion pr oce ss; (c) bet ter corrosion res istance since the steel cylinder and wire are protected inside the concrete; (d) improved leakage protection due to the act that the steel cylinder and rubber gasket installed at the pipe joint under pressure will ensure good resistance to leakage. Te ew projects using PCCP or pipe-jacking only use small diameter cross section and or short distance jacking. And the PCCP have been proven to be sae and easible to be used in pipe jacking method. However, the question rises as to whether the structure remains sae and reliable when the pipe diame ter is increas ed to mm and or long jacking dis tance. In thi s paper, we aim to st udy the mec han ica l behavior o the PCCP under such condition and possible ailure mechanism subject to axial and lateral compressive loading conditions. Te present mapper will model the PCCP ailure by employing materials models suitable or concrete and steel. Te inter ace ai lure bet wee n lay ers o the str uct ure will also be taken into account. Te numerical methods or the Hindawi Publishing Corporation Mathematical Problems in Engineering Volume 2015, Article ID 579869, 11 pages http://dx.doi.org/10.1155/2015/579869

579869

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