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.
出处
《中州煤炭》
2011年第9期38-42,共5页
Zhongzhou Coal
关键词
采空塌陷
管道
WINKLER地基
有限元
几何大变形
非线性理论
mining collapse
pipeline
Winkler foundation
finite element
geometry big deformation
nonlinearity theory
