加载条件下不同埋深原水管道受力特征模型试验

Model tests on stress characteristics of raw water pipeline with different buried depths under loading conditions

为探究不同埋置深度对原水管道影响,利用缩尺模型对不同埋深条件下原水管道受力特征进行分析,综合研究管道外径、管道埋深、加载值和加载方式等因素对管道受力影响。结果表明:中心加载条件下,随管道埋深增加,管道应力呈先增大后减小趋势,当埋深厚度与管径比值为3时,管道应力达到最大,土拱效应开始显现;偏心加载条件下,埋深厚度增大使管道应力不断增加,但后期管道应力增长率小于前期;相同埋深厚度条件下,中心加载与偏心加载条件下,同截面管底处应力值相对最大。研究结果可为不同埋深区域内原水管道维护运营提供指导。

In order to explore the influence of different buried depths on the operation and usage of raw water pipelines,the scaled model tests were used to analyze the stress characteristics of raw water pipelines under different buried depths.Through the design of different test conditions,the influence of outer diameter of pipeline,buried depth of pipeline,loading value,loading method and other factors on the stress of pipeline was comprehensively studied.The results showed that under the condition of central loading,the stress of pipeline increased first and then decreased with the increase of the buried depth of pipeline,and the stress of pipeline was the largest when the ratio of the buried depth to the pipe diameter was about 3 times,then the soil arching effect began to appear.Under the condition of eccentric loading,the stress of pipeline increased with the increase of the buried depth of pipeline,but the increasing rate of the stress of pipeline in the later stage was smaller than that in the earlier stage.Under the same buried depth,the stress at the bottom of pipeline was always the largest whether adopting the central loading or eccentric loading.The results can provide important guidance for the maintenance and operation of raw water pipelines with different buried depths.