跨断层地下管线振动台模型试验研究Ⅱ:试验成果分析
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摘要
针对跨断层地下管线进行振动台模型试验研究。试验中将钢管埋设在一个盛装砂土、可以模拟走滑断层错动作用的模型箱中,研究地下管线在承受断层错动时应变的分布规律和管周动土压力变化规律,并考察地下管线与断层的夹角以及管内水体的影响。试验结果表明:在跨断层地下管线中,管-土系统本身的动力效应的影响较小,可以忽略不计,而管内液体可能有较大的影响,不可忽略;在无法避开断层区域的情况下,地下管线最好与断层垂直;管线的最大应变发生在断层附近一定距离的位置;管-土动力相互作用及其变化规律对管道响应影响很大。
A shaking table test for fault-crossing buried pipelines is implemented.The pipes are buried in a container which is filled with sandy soil and can simulate the movement of a strike-slip fault.The strain and deformation of the pipes and the pressure between pipe and soil are analyzed.The effects of the fault-pipe angle and the water in pipe are also investigated.According to the test results,the dynamic effect of the pipe-soil system is relatively unimportant and can be neglected,but the impact of the liquid in pipe cannot be always neglected.When fault cannot be avoided,the pipelines are better placed perpendicularly to the fault.The maximum strain always occurs at some distance away from the fault.The dynamic pipe-soil interaction may significantly impact the pipes.
A shaking table test for fault-crossing buried pipelines is implemented.The pipes are buried in a container which is filled with sandy soil and can simulate the movement of a strike-slip fault.The strain and deformation of the pipes and the pressure between pipe and soil are analyzed.The effects of the fault-pipe angle and the water in pipe are also investigated.According to the test results,the dynamic effect of the pipe-soil system is relatively unimportant and can be neglected,but the impact of the liquid in pipe cannot be always neglected.When fault cannot be avoided,the pipelines are better placed perpendicularly to the fault.The maximum strain always occurs at some distance away from the fault.The dynamic pipe-soil interaction may significantly impact the pipes.
引文
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[2]李杰.生命线工程抗震———基础理论与应用[M].北京:科学出版社,2005
[3]刘爱文,胡聿贤,李小军,等.大口径埋地钢管在地震断层作用下破坏模式的研究[J].工程力学,2005,22(3):82-87(Liu Aiwen,Hu Yuxian,Li Xiaojun,et al.Damage behavior of large-diameter buried steel pipelines under fault movements[J].Engineering Mechanics,2005,22(3):82-87(in Chinese))
[4]李勇,黄润秋,周荣军,等.龙门山地震带的地质背景与汶川地震的地表破裂[J].工程地质学报,2009,17(1):3-16(Li Yong,Huang Runqiu,Zhou Rongjun,et al.Geological background of Longmen Shan seismic belt and surface ruptures in Wenchuan earthquake[J].Journal of Engineering Geology,2009,17(1):3-16(in Chinese))
[5]冯启民,郭恩栋,宋银美,等.跨断层埋地管道抗震试验[J].地震工程与工程振动,2000,20(1):56-62(Feng Qimin,Guo Endong,Song Yinmei,et al.Aseismic test of buried pipe crossing fault[J].Earthquake Engineering and Engineering Vibration,2000,(1):56-62(in Chinese))
[6]张志超,王进廷,徐艳杰.跨断层地下管线振动台模型试验研究(I)-试验方案设计[J].土木工程学报,2011,44(11):93-98(Zhang Zhichao,Wang Jinting,Xu Yanjie.Shaking table test for cross-fault buried pipelines(I)—model design[J].China Civil Engineering Journal,2011,44(11):93-98(in Chinese))
[7]Wang L R L,Wang L J.Parametric study of buried pipeline due to large fault movements[C]//Proceedings of 3rd China-Japan-US Trilateral Symposium on Lifeline Earthquake Engineering.Kunming,1998
[8]冯启民,赵林.跨越断层埋地管道屈曲分析[J].地震工程与工程振动,2001,21(4):80-87(Feng Qinmin,Zhao Lin.Bulking analysis of buried pipes subjected to fault movement[J].Earthquake Engineering and Engineering Vibration,2001,21(4):80-87(in Chinese))
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