管土接触作用下管道沉陷复杂应力分析

Analysis on complex stress exerted on settled pipeline under the effect of pipe soil contact

场地沉陷是导致埋地管道破坏的重要原因之一。应用管道与土体接触作用的半无限屈服理论,建立了沉陷作用下管土相互作用模型,以土壤和管道自重为载荷,计算了沉陷区长度、壁厚、内压、管径、管土摩擦因数、管道埋深等复杂因素作用下的管道应力,分析了其对管道Mises应力的影响规律,进而评估管道的安全性。算例分析结果表明,该方法能够较好模拟管道的破坏过程,可为沉陷区域埋地管道数值模拟提供理论依据。(表3,图7,参10)

Site settlement is one of the major reasons causing damage to buried pipelines. Pipe-soil interaction model under settlement was built by using the semi-infinite yield theory of pipeline and soil contact. Taking the soil and pipeline weight as a load, the pipeline stress under the combined effect of settlement area length, pipe wall thickness, internal pressure, pipe diameter, soil friction factor, and pipeline burial depth was calculated, its effect on pipeline Mises stress was analyzed, and the pipeline safety was evaluated. Case study shows that this method can simulate the process of pipeline damage accurately, providing a theoretical basis to the numerical simulation of buried pipeline in sinking area. （3 Tables, 7 Figures, 10 References）