交通载荷作用下PE煤层气管道安全性研究

发布时间：2018-01-11 04:26

本文关键词：交通载荷作用下PE煤层气管道安全性研究　出处：《重庆科技学院》2015年硕士论文　论文类型：学位论文

【摘要】：论文的选题来源于筠连区块煤层气田地面工程建设项目。由于聚乙烯管道（PE管道）使用寿命长，具有卓越的耐腐蚀性，柔韧性强，抗地震能力强，本工程采用聚乙烯管道输送煤层气。但是，聚乙烯管道亦有其缺点：抗压能力弱，重压易造成管材变形；抗紫外线能力弱，紫外线会加速其老化，，降低管道强度；抗冲击能力低，遇到外力易破损，发生煤层气泄漏。本工程PE输气管道沿途经过城镇规划区、人口密集区、重要建筑物等敏感区域，一旦发生煤层气泄漏，可能引发火灾爆炸事故，将会造成极大的人身、财产损失，带来极坏的社会影响。管道失效破坏的原因在于管道所承受的载荷大于其承载能力。本工程埋地PE管道所承受的主要载荷为交通载荷、管顶上部覆土压力以及管道内压。论文应用ANSYS软件建立埋地PE管道有限元模型，根据数值模拟结果，分析PE管的失效性。对管道失效引起的煤层气泄漏事故的影响范围进行计算，从控制PE管道自身安全、控制安全距离、管道工程安全管理三方面提出安全对策措施。主要内容有：（1）应用ANSYS软件，建立埋地PE管道有限元模型，得到管道应力、位移分布情况，研究不同交通载荷对管道力学性状的影响，分析管道的安全性。（2）分别采用基于事故后果的方法和基于风险的方法计算典型管线煤层气泄漏事故影响范围。（3）根据计算结果，分析应采取的安全措施。
[Abstract]:The topic originates in Junlian CBM gas field ground engineering construction project. The polyethylene pipe (PE pipe) long service life, excellent corrosion resistance, strong flexibility, anti seismic capability, this project adopts polyethylene pipeline gas. However, the polyethylene pipe has its shortcomings: the compressive strength is weak, the weight is easy to cause the pipe deformation; anti ultraviolet ability weak, ultraviolet rays will accelerate the aging, reduce the pipeline strength; anti impact ability is low, have damaged external leak methane. The PE gas pipeline passes through the town planning area, densely populated areas, important buildings and other sensitive areas, once the occurrence of coal seam gas leakage that may cause fire and explosion accident, will cause great personal and property losses, brought very bad social influence.
The reason lies in the failure of the pipeline pipeline under load than its carrying capacity. The main load of this project buried PE pipeline under traffic load, the top of the pipe and the upper overburden pressure pipeline internal pressure. The application of ANSYS software to establish the finite element model of buried pipeline PE, according to the results of numerical simulation, the failure analysis of PE pipe. The influence range of coalbed gas caused by the failure of pipeline leakage accident is calculated from safety control of PE pipeline control, safety distance, safety measures put forward three aspects of safety management of pipeline engineering. The main contents are:
(1) establish the finite element model of buried PE pipeline by using ANSYS software, get the stress and displacement distribution of pipeline, study the influence of different traffic loads on the mechanical properties of pipeline, and analyze the safety of pipeline.
(2) the impact range of the typical pipeline coal seam gas leakage accident is calculated by the method based on the accident consequence and the method based on the risk.
(3) according to the results of the calculation, the safety measures should be taken.

【学位授予单位】：重庆科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE88

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