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隧道开挖和管线置换引起的应力变化将不可避免地导致土体位移,进而对上覆既有管线产生诸多的不利影响。国内外学者对管-土相互作用开展了大量的研究,但用于预估隧道开挖和管线置换引起既有管线弯曲变形的简单并且有效的设计图表尚未提出。采用ABAQUS商业软件,对隧道-土-管线、管线置换-土-管线间的相互作用开展系统的有限元仿真模拟。通过采用管线不同运动方向下的等效管-土相对刚度,提出了隧道开挖和管线置换引起的管线弯曲变形的设计图表,并采用现场实测数据和离心模型试验结果验证此设计图表的合理性。设计图表中的管线最大弯曲曲率与土体最大曲率的比值和管-土相对刚度具有非常好的相关性。工程师一旦得到隧道开挖或管线置换引起的土体位移、管线尺寸、管线参数和土体参数,此设计图表可用来预测隧道开挖或管线置换引起既有管线的最大弯曲曲率。
Stress changes caused by tunnel excavation and pipeline replacement will inevitably lead to soil displacement, which in turn will have a lot of adverse effects on the overlying existing pipeline. Scholars at home and abroad have done a lot of research on pipe-soil interaction. However, simple and effective design charts for predicting the bending deformation of existing pipelines due to tunnel excavation and pipeline replacement have not been proposed yet. ABAQUS commercial software was used to simulate the interaction between tunnel-soil-pipeline, pipeline replacement-soil-pipeline system. By using equivalent pipe-soil relative stiffness under different movement directions of pipelines, a design chart of pipeline bending deformation caused by tunnel excavation and pipeline replacement is put forward, and the rationality of this design chart is verified by field measurement data and centrifugal model test results . The ratio of the maximum curvature of the pipeline to the maximum curvature of the soil and the relative stiffness of the pipe-soil in the design chart have a very good correlation. Once engineers have obtained soil displacement, pipeline size, pipeline parameters, and soil parameters due to tunneling or pipeline replacement, this design chart can be used to predict the maximum curvature of curvature of an existing pipeline as a result of tunneling or pipeline replacement.