人工爆破地震作用下输气管道动力响应分析  

Dynamic response for buried gas pipelines under artificial explosion

作　　者：彭星煜[1] 梁光川[1] 张鹏[1] 喻建胜 何莎 宋日生 

机构地区：[1]西南石油大学 [2]中国石油川庆钻探工程公司安全环保质量监督检测研究院

出　　处：《天然气工业》2012年第11期81-84,122,共4页Natural Gas Industry

基　　金：国家自然科学基金国际合作交流项目(编号:512101105);特色重点学科建设项目资助青年教师科学基金项目;四川省教育厅青年基金项目(编号:省609)

摘　　要：为了保障人工爆破施工环境下天然气管道的安全运行,以管道典型第三方作用爆破施工为对象,通过分析天然地震波传播特性、波形和频谱特性,以峰值加速度指标作为地震主要动参数,采用期望反应谱作为目标谱,基于SIMQKE_GR程序模拟了人工地震加速度波形图,建立了基于有限单元法地基梁—土弹簧模型的爆破地震作用下管道地震响应有限元模型,得到了管道在爆破地震作用下的位移、应力和管道应变随时间的变化特性:若管道长度大于200m,边界条件对所取管段中间部位的反应影响很小,管道中部的响应就可以代表整个管道中大多数位置的响应程度,将管道中间点的位移变量与土壤质点的位移变量相减得到相对位移变量,就可以反映出爆破地震中管道与土壤的相对位移。最后将ANSYS模拟结果与管道抗震设计规范进行了对比分析,结果表明:ANSYS模拟结果的轴向应变最大值为0.001 1,与采用抗震规范法计算出的最大轴向应变0.001 3极为接近。该模型的模拟计算较为准确,为管道爆破施工安全控制提供了理论基础。This paper aims to discuss how to maintain the safe operation of buried natural gas pipelines under the environment of artificial explosion.Taking a typical third-party blasting effect as the study object,this paper first analyzed the characteristics of seismic wave propagation,waveforms and spectrum.Then,with peak acceleration indicators as main dynamic parameters,and with the expected spectrum as the target response spectrum,the blasting seismic waveforms were simulated based on the SIMQKE_GR program.Furthermore,the foundation beams-soil spring model was established by use of the finite element method to reflect the pipeline response under the effect of blasting seism,from which we acquired how the displacement,stresses and strain characteristics of pipelines are changing along with the time.That is,if the line was longer than 200m,the boundary condition would have little impact on the middle part of the simulated pipeline,where the response could represent the response degree of multiple parts of the whole line;the relative displacement variable was obtained by subtracting the displacement variable of soil mass-point from that of the middle point in the line,which could reflect the relative displacement between the pipeline and soil under blasting seism.Finally,a comparative analysis showed that the ANSYS simulation results in this study agreed well with the seismic design code of the pipelines.For example,the maximum value of axial strain in the ANSYS simulation was 0.0011,while that in the seismic design code was 0.0013.In conclusion,this study provides a foundation in theoretical studies of maintaining the safe operation of pipelines under the blasting seismic construction.

关 键 词：输气管道 人工爆破地震 动力响应 SIMQKE_GR程序 地基梁—土弹簧模型 

分 类 号：TE973[石油与天然气工程—石油机械设备]