煤矿采空塌陷区埋地管道力学分析
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摘要
煤矿埋地瓦斯气体管道在遭到采空塌陷后,将使局部管道脱离地层支撑而悬空,严重时造成管道断裂破坏,给煤矿安全带来巨大隐患和威胁。采用基于Winkler地基梁模型理论推导和有限元数值模拟的方法分析采空塌陷对管道安全的影响。建立了管道遭受采空塌陷的几何大变形力学分析模型和有限元力学模型,采用非线性理论对力学模型进行求解。计算结果表明:理论推导计算方法和有限元法的管道分析结果具有较好的一致性,误差满足工程精度的要求;当采空塌陷区长度达到20 m时,管道发生失效屈服破坏;土弹簧刚度较小有利于管道的安全,管道通过增加壁厚和外径以及减小埋深能够有效提高管道的安全性。
When buried gas pipeline of mining coal suffered the mining collapse,part pipeline broke away from the stratum and was suspended in midair,pipeline might be fractured,it brought hidden trouble and menace to the safety of coal mine.The impact of the mining collapse geology disaster on pipeline safety was studied by adopting elastic foundation theory based on Winkler assumption and finite element numerical simulation.The geometry big deformation mechanics analysis model and finite element model was built on the pipeline suffered the mining collapse geology disaster,the mechanics model was solved by adopting nonlinearity theory.The calculation results showed that the analysis result of pipeline is a consistent for theoretical calculation and finite element,the error accords with project accuracy;the pipeline just happens to be destroyed when the length of mining collapse reaches 20 m;it is good for the pipeline safety that the soil spring stiffness is smaller,the pipeline safety is effectively improved by increasing wall thickness and outer diameter of pipeline but diminishing buried depth of pipeline.
When buried gas pipeline of mining coal suffered the mining collapse,part pipeline broke away from the stratum and was suspended in midair,pipeline might be fractured,it brought hidden trouble and menace to the safety of coal mine.The impact of the mining collapse geology disaster on pipeline safety was studied by adopting elastic foundation theory based on Winkler assumption and finite element numerical simulation.The geometry big deformation mechanics analysis model and finite element model was built on the pipeline suffered the mining collapse geology disaster,the mechanics model was solved by adopting nonlinearity theory.The calculation results showed that the analysis result of pipeline is a consistent for theoretical calculation and finite element,the error accords with project accuracy;the pipeline just happens to be destroyed when the length of mining collapse reaches 20 m;it is good for the pipeline safety that the soil spring stiffness is smaller,the pipeline safety is effectively improved by increasing wall thickness and outer diameter of pipeline but diminishing buried depth of pipeline.
引文
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[2]陈铭,王继仁.煤矿瓦斯灾害防治技术的研究[J].煤炭技术,2009,28(3):1-3.
[3]卢平.煤矿瓦斯灾害事故频发的原因及其对策分析[J].安全,2005(3):6-10.
[4]李铁良,陶玉梅,刘先平,等.采空区瓦斯涌出特征与抽放方法综述[J].煤矿安全,2003,34(4):22-24.
[5]龚乃勤.采空区瓦斯抽放方法与展望[J].煤矿安全,2004,35(11):31-33.
[6]龙驭球.弹性地基梁的计算[M].北京:高等教育出版社,1981.
[7]唐永进.压力管道应力分析[M].北京:中国石化出版社,2003.
[8]刘爱文,胡聿贤,赵凤新,等.地震断层作用下埋地管线壳有限元分析的等效边界方法[J].地震学报,2004,26(增):141-147.
[9]李鹏程,刘惠珊,官国军,等.地震地面大位移对埋地管线影响的有限元分析[J].工业建筑,2000,30(6):49-52.
[10]柳春光,史永霞.沉陷区域埋地管线数值模拟分析[J].地震工程与工程振动,2008,28(4):178-183.
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