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近年来,高频重载交通作用致使埋地HDPE管道压屈,进而导致管道破坏事故频发。弯矩是评价管道压屈的重要指标之一。然而,现阶段鲜有关于交通荷载作用下管道附加弯矩的相关研究报道。以管道工程中广泛采用的HDPE管道为研究对象,基于现场足尺试验和数值计算,研究了交通荷载作用下埋地HDPE管道附加弯矩的影响因素及变化规律。研究结果表明:(1)相同管道直径和埋深条件下,交通荷载引起管道的超载弯矩比n(即附加弯矩与管道初始装配弯矩的比值)与交通荷载的大小呈线性关系,且n为定值;(2)n的大小与管顶埋深成指数函数关系,管径对n值的影响可以忽略不计。基于现场试验和数值计算结果,本文提出了交通荷载作用下HDPE管道最大附加弯矩的经验公式,并对经验公式的有效性进行了验证。
In recent years, high-frequency heavy traffic caused buried HDPE pipe buckling, which led to frequent accidents of pipeline damage. Bending moment is one of the important indexes to evaluate tube buckling. However, there are few reports about the additional bending moment of pipe under traffic load at this stage. Taking HDPE pipe widely used in pipeline engineering as the research object, the influencing factors and changing rules of additional bending moment of buried HDPE pipe under traffic load are studied based on field full-scale test and numerical calculation. The results show that: (1) Under the condition of the same pipe diameter and depth, the overload moment ratio n (ie, the ratio of additional bending moment to initial assembly bending moment) of pipeline caused by traffic load has a linear relationship with the traffic load magnitude n is the fixed value; (2) the size of n and the top of the tube exponential function, the diameter of the n value can be neglected. Based on field tests and numerical results, this paper presents empirical formulas of maximum additional bending moment of HDPE pipes under traffic load, and the validity of empirical formulas is verified.