径向载荷作用下的管道挤压变形模型

针对长输管道泄漏抢修的特点,利用管道局部挤压的方法,能够在短时间内最大限度地减少或防止油品泄漏危害。基于管道塑性变形理论和能量守恒原理,结合"Bow-tie"管道塑性变形计算模型,建立了管道径向载荷作用下的挤压变形模型,对管道挤压和管内泄漏余压作用下的塑性变形进行分析计算。得到了不同管径管道挤压所需载荷量,利用非线性拟合得到了挤压载荷的分布数据。分析表明:管道挤压载荷随管径、屈服应力的变化,呈现S形递增。该模型可以确定不同管道的挤压变形载荷,为管道挤压抢修提供理论和实践依据。

Model for pipeline extrusion deformation under radial load

Potential hazards from oil leakage can be reduced to the greatest extend or prevented within a short period by means of partial pipeline extrusion technique, according to the characteristics of emergency repair for the leakage of long-distance pipeline. This paper, based on theory of pipeline plastic deformation and principle of the conservation of energy, has formed a model for pipeline extrusion deformation under radial load with the combination of computation model of "Bow-tie" pipeline plastic deformation, and also analyzed and worked out the plastic deformation driven by pipeline extrusion and residual pressure inside pipeline leakage, thus loads required for pipeline extrusion with different sizes as well as distributions of extrusion loads using nonlinear fi tting are gained. Results indicate that pipeline extrusion loads increase gradually in S-shape with changing pipe sizes and yield stresses. This model is applicable for determination on loads of pipeline extrusion deformation and also used as the theoretical and practical basis for pipeline extrusion repair.