A finite element model of rockfall-soil-pipe was established to study the influence of rockfall impact on the safe operation of Prestressed Concrete Cylinder Pipe (PCCP).The process of spherical rockfall impact on buried PCCP was simulated on the basis of the calculation of static load condition.By changing the radius and height of rockfall,the stress and plastic strain of pipeline under different rockfall impact loads were examined.Results demonstrated that PCCP under rockfall impact mainly suffered from circumferential tensile plastic damage.Compared with the height of rockfall,the change of rockfall radius had a greater influence on PCCP.At a suspension height of 10 m,the falling rock with a radius over 1.4 m would cause visible cracks in the material with the plastic strain of concrete tube core exceeding 16.0×10-4 and the plastic strain of mortar over 9.1×10-4.Under rockfall impact load,concrete tube core first witnessed damage,and then mortar,steel tube,and prestressed steel wire in sequence.After the crack of concrete tube core,steel tube and prestressed steel wire saw rapid increase and yield failure of Mises stress.
Key words
PCCP /
buried pipeline /
impact road /
rockfall /
finite element model /
dynamic response
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References
[1] 王建慧,陈 晨,张海鹏,等.预应力钢筒混凝土管在水工结构中的应用[J].水利发展研究,2018,18(10):46-49,69.
[2] 马志远,闫朝范,郑 涛.浅析PCCP的发展与推广应用[J].河南水利与南水北调,2013,19(16):92-93.
[3] 鲜 福,关惠平,姚安林,等.西气东输管道地质灾害辨识[J].油气田地面工程,2010,29(3):80-82.
[4] 胡厚田.崩塌与落石[M].北京:中国铁道出版社,1989.
[5] RUTA P,SZYDLO A.Drop Weight Test Based Identification of Elastic Half Space Model Parameters[J].Journal of Sound and Vibration,2005(285):411-427.
[6] 陈洪凯,唐红梅,叶四桥,等.危岩防治原理[M].北京:地震出版社,2006:151.
[7] THORNTON C,NING Ze-min.A Theoretical Model for the Stick Bounce Behavior of Adhesive,Elastic-Plastic Sphere[J].Powder Technology,1998,99:157-162.
[8] 杨其新,关宝树.落石冲击力计算方法的试验研究[J].铁道学报,1996,18(1):101-106.
[9] PLASSIARD J P,DONZE F.Rockfall Impact Parameters on Embankments:A Discrete Element Method Analysis[J].Structural Engineering International,2009,19(3):333-341.
[10] ZHANG Jie,LIANG Zheng,HAN Chuan-jun,et al.Buckling Behaviour Analysis of a Buried Steel Pipeline in Rock Stratum Impacted by a Rockfall[J].Engineering Failure Analysis,2015,58:281-294.
[11] ZHANG Jie,LIANG Zheng,FENG Ding,et al.Response of the Buried Steel Pipeline Caused by Perilous Rock Impact:Parametric Study[J].Journal of Loss Prevention in the Process Industries,2016,43:385-396.
[12] 卓明昭,曾祥国,吴 斐,等.高压输气管道在落石冲击作用下热点应力确定的数值方法研究[J].工程结构,2012,32(1):154-157.
[13] 张 杰,梁 政,韩传军,等.落石冲击作用下架设油气管道响应分析[J].中国安全生产科学技术,2015,22(7):11-17.
[14] ANSI/A WWA C304-99,Design of Prestressed Concrete Cylinder Pipe[S].USA:AWWA,1999.
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