在管隧间距较小的情况下隧道开挖对上覆管线的影响不可忽略。针对隧道开挖下穿既有管线这一特殊工况,采用透明土和PIV技术对连续与非连续管线的变形规律展开对比研究。通过对土体位移随隧道开挖的动态变化实施全程观测并采用控制变量法分析了抗弯刚度、管线埋深以及非连续管线的管节长度对管线变形的影响,结果表明:无论是连续管线还是非连续管线的沉降模式基本符合Gaussian沉降曲线;连续管线最大沉降值随着抗弯刚度的增大而逐渐减小且随着管线埋深的增大而逐渐增大;非连续管线的最大沉降值随着管节长度的增大而呈现先增大后减小的趋势;非连续管线与隧道的相对位置对其沉降有显著影响,当非连续管线接口在隧道轴线正上方时,其最大沉降值明显高于隧道轴线位于管节中心正下方的情况,表明隧道下穿位置接近非连续管线接口处为最危险情况,设计时应尽量避免。
The influence of tunnel excavation on the overlying pipeline cannot be ignored when the distance between the pipeline and tunnel is minor. For the special condition of tunnel excavation through the existing pipeline, the transparent soil and PIV technologies were adopted to conduct a comparative study on the deformation regularities of continuous and non-continuous pipelines. The dynamic change of soil displacement with tunnel excavation was monitored, and the influence of bending stiffness, depth and section length of pipelines on their deformation was analyzed by the control variable method. The results show that: The settlement patterns of both continuous and non-continuous pipelines are basically consistent with the Gaussian settlement curve. The maximum settlement value of continuous pipeline decreases with the increase of flexural stiffness and increases with the increase of pipeline burial depth. The maximum settlement value of discontinuous pipeline increases first and then decreases with the increase of pipeline section length. In addition, the relative position between the non-continuous pipeline and tunnel has a significant impact on the pipeline settlement. When the non-continuous pipeline interface is directly above the tunnel axis, its maximum settlement value is significantly higher than those value when the tunnel axis is directly below the pipeline joint center, indicating that the tunnel crossing position close to the non-continuous pipeline interface is the most dangerous situation which should be avoided as soon as possible in design.
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