摘要
开采沉陷引发地表变形,导致埋地管道大范围弯曲变形,对管道安全运行构成严重威胁。采用概率积分法预测沉陷区地表三维变形,考虑管-土间的轴向作用和管材非线性等因素,推导管道物理伸长和几何伸长的变形协调方程,迭代求解管道轴心应力和应变。通过实例分析了开采沉陷区埋地管道的应力-应变分布。结果表明,管道除了发生空间弯曲变形外,管-土间的摩擦力还导致管道产生轴向拉、压变形。解析方法计算结果与有限元方法吻合较好,适于以任意角度穿越沉陷区埋地管道的应力-应变计算。分析了开采参数、管道参数以及回填土性质等对管道的变形和应力影响,提出沉陷区埋地管道最大应力与应变的简化评定公式。
Mining induced ground surface subsidence could result in pipeline bending in a large scale which has great threatening to pipeline safety.An analytical methodology for evaluating stress and strain distribution of buried pipeline crossing mining subsidence area is developed.Ground surface spatial deformation due to mining is predicted by using Probability function integration method.Deformation compatibility equation between pipeline physical elongation and pipeline geometrical elongation is derived taking care of axial pipe-soil friction and steel pipe material nonlinearity;and pipeline stress and strain are calculated with iterative solving method.With proposed method,stress and strain distribution of pipeline crossing mining subsidence area is investigated.The result shows that tensile and compressive deformations at different pipeline segments due to pipe-soil friction associates with pipeline spacial bending deformation.Results of proposed method are close to that of finite element method and it is approved to be competent for investigating the response of buried pipeline crossing mining subsidence with any angle.Finally,effects of mining,pipeline and backfill on pipeline deformation and stress are analyzed;and two simple equations for evaluating the maximum stress and strain of pipeline are developed.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第11期3373-3378,3386,共7页
Rock and Soil Mechanics
基金
"十一五"国家科技支撑计划课题(No.2006BAK02B01)
关键词
埋地管道
开采沉陷
应力-应变
解析计算方法
管-土相互作用
buried pipeline
mining subsidence
stress and strain
analytical methodology
pipe-soil interaction
