埋地球墨铸铁供水管道轴向拉拔试验
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摘要
目的对埋地球墨铸铁管道进行抗拉静载试验,分析管道接口力学性能以及砂土对管道产生的摩擦力,确定地震作用下管道接口抗拉拔强度,以该指标作为判断管道抗震性能的依据.方法管道采用T型胶圈连接的柔性接口,在覆土的情况下,对150 mm和200 mm两种管径的管道注水后,分别进行6次静力拉拔试验.结果直径150mm和200 mm管道的接口位移所承受的最大值分别为56.97 mm和57.52 mm.水压随着位移的增大基本没有太大变化,直到管道接口破坏,管体内水压才突然下降.结论球墨铸铁管柔性接口管道抗震性能较好,管径越大抗震性能越好.管道与砂土之间的相对位移是影响管道抗震性能的主要因素之一,增加承插式管道的承口深度有助于提高管道的抗震性能.
Through the analysis of the experiment of the flexible joint ductile cast iron pipeline,the joint strength and the friction between the sand and pipelines were studied,and the resistance drawing strength of the pipelines was determined,which could be used as an index to evaluate their seismic performance.Pullout test of the T-type flexible joint of the ductile cast iron pipelines with two kinds of diameters was carried out under the situation of water injected in the pipelines and soil coving them.Strength-displacement curves and hydraulic pressure-displacement curves were measured and the seismic influencing factors were analyzed based on these curves.The following conclusions are gotten:the seismic performance of the flexible joint ductile cast iron pipeline is good;the seismic performance of the ductile cast iron pipeline is related to its diameter,i.e.the greater the diameter is,the better seismic performance is;the relative displacement between the sand and pipelines is one of the main factors influencing the seismic behavior of pipelines;increasing the depth of Socket-mouth in the pipeline will improve the pipeline's seismic performance.
Through the analysis of the experiment of the flexible joint ductile cast iron pipeline,the joint strength and the friction between the sand and pipelines were studied,and the resistance drawing strength of the pipelines was determined,which could be used as an index to evaluate their seismic performance.Pullout test of the T-type flexible joint of the ductile cast iron pipelines with two kinds of diameters was carried out under the situation of water injected in the pipelines and soil coving them.Strength-displacement curves and hydraulic pressure-displacement curves were measured and the seismic influencing factors were analyzed based on these curves.The following conclusions are gotten:the seismic performance of the flexible joint ductile cast iron pipeline is good;the seismic performance of the ductile cast iron pipeline is related to its diameter,i.e.the greater the diameter is,the better seismic performance is;the relative displacement between the sand and pipelines is one of the main factors influencing the seismic behavior of pipelines;increasing the depth of Socket-mouth in the pipeline will improve the pipeline's seismic performance.
引文
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[10]Zerva A,Ang A H S,Wen Y K.Lifeline response tospatially variable ground motion[J].Earthquake En-gineering and Structural Dynamics,1988,16(3):361-369.
[11]吴雯琼,张亮源,新兴的球墨铸铁管[J].城市公用事业,1994,6(8):26-27.
[2]赵成刚,冯启民.生命线地震工程[M].北京:地震出版社,1994.
[3]孙绍平.中国地下管道的震害[M].北京:学术书刊出版社,1990.
[4]程炯.T型接口球墨铸铁管道施工技术要点[J].山西建筑,2007,2(4):164-165.
[5]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.
[6]Duke C M,Moran D F.Guideline for evolution oflifelines earthquake engineering[C]//Proceedings ofU.S.National Conference on Earthquake Engineer-ing.Oakland:Earthquake Eng Resist,1975.
[7]Xu Chengchao,Goulter I.C..Probabilistic model forwater distribution reliability[J].Water ResourcesPlanning and Management,1998,124(4):218-228.
[8]孙绍平.国外生命线地震工程的研究情况[J].地震工程动态,1984(1):6-11.
[9]Rourkc O,Liu M X.Response of buried pipelinesubjected to earthquake effects[J].InternationalJournal of Soil Dynamics and Earthquake Engineer-ing,1990,9(1):44-55.
[10]Zerva A,Ang A H S,Wen Y K.Lifeline response tospatially variable ground motion[J].Earthquake En-gineering and Structural Dynamics,1988,16(3):361-369.
[11]吴雯琼,张亮源,新兴的球墨铸铁管[J].城市公用事业,1994,6(8):26-27.
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