摘要:
埋地柔性管道的承载能力与周围土体对其的支撑作用密切相关，管-土间的相互作用力对管道的稳定运行至关重要，而一旦地基土体发生错动变形，柔性管道在接头位置处容易因不均匀支撑而发生转角破坏。本文通过室内模型试验，探究了柔性管道接头在地基土体错动变形下的力学行为。基于Winkler弹性地基梁理论，分别针对于力矩完全释放接头、力矩部分传递接头和力矩完全传递接头，提出了柔性管道接头转角的理论计算公式，并利用模型试验数据对所提出的公式进行了分析验证。研究发现，柔性管道接头的受力变形与地基土体错动变形量密切相关，相较于力矩完全释放接头公式，采用力矩部分传递接头公式能更准确地计算管道接头在地基土体错动变形下的转角。当管道直径、埋深和填料内摩擦角增大时，管道接头所能容许的最大地基土体错动变形量随之减小，管道接头转角分别呈现出线性增长、对数增长以及指数增长的趋势。此外，随着地基错动变形量的增加，上述增长趋势均变得越来越显著。
Abstract:
The bearing capacity of buried flexible pipes depends closely on the support provided by the surrounding soil, and the interaction forces between the pipe and the soil are crucial for ensuring the stable operation of the pipeline. When differential ground motion occurs, the flexible pipe is susceptible to angular damage at the joints due to uneven support. This paper investigates the mechanical behavior of flexible pipe joints under differential ground motion through laboratory model test. Using the Winkler elastic foundation beam theory, theoretical formulas are proposed for calculating the rotational angle of flexible pipe joint under conditions of fully released moment, partially transmitted moment, and fully transmitted moment. These proposed formulas are then analyzed and verified using model test data. The research reveals that the deformation of flexible pipe joint is closely linked to the amount of differential ground motion. Compared to the formula for fully released moment joints, using the formula for partially transmitted moment joints yields a more accurate calculation of the rotational angle of the pipe joint under differential ground motion. As the pipe diameter, burial depth, and internal friction angle of the backfill material increase, the maximum allowable differential ground motion that the pipe joint can handle decreases accordingly. Additionally, the joint rotational angle shows trends of linear, logarithmic, and exponential growth, respectively. Furthermore, with the increase in differential ground motion, these growth trends become increasingly pronounced.
百度学术
下载:
