The finite element analysis are performed to investigate a long-term response of flexible pipe buried in sand trench embedded in native soft clay. The investigated long-term behaviors are due to effects of backfill soil structure rearrangement and native clay consolidation. The finite element results suggest that the short-term response of pipe depends strongly on trench widths but independent of trench depths due to the dependence of arching effect with trench width. However, the effects of trench width become less important for long-term pipe response. Moreover, the mechanism of this long-term response is likely due to backfill soil structure rearrangement, which occurs within a shorter time, not consolidation of native clay. The importance of finite element modelling of interface between sand backfill and clay trench and modelling of construction sequence on the obtained pipe-soil interaction are investigated. For long-term consideration, modelling of interface between sand backfill and clay trench is important; however, modelling of construction sequences is not so. Prism load seems to give better results for long-term load. Available analytical solutions cannot accurately estimate both vertical load and pipe deflection at short term for narrow trench due to a strong influence of arching effect after backfilling. At long term, Iowa formula under-predicts the horizontal pipe deflection by the ratios of 0.40–0.52 which correspond with a deflection lag factor D_L of 1.9–2.5. The time lags of narrow trench obtained from this study are 1.6–1.9 and they become smaller for wide trench.

进行有限元分析以研究埋在天然软粘土中的沙沟中的柔性管的长期响应。调查的长期行为是由于回填土结构重新排列和天然粘土固结的影响。有限元结果表明，由于拱效应与沟槽宽度的相关性，管道的短期响应强烈依赖于沟槽宽度，但与沟槽深度无关。然而，沟槽宽度的影响对于长期管道响应变得不那么重要。此外，这种长期反应的机制可能是由于回填土结构重新排列，这种重新排列发生在更短的时间内，而不是原生粘土的固结。研究了沙子回填土和粘土沟槽之间界面的有限元建模以及施工顺序对获得的管土相互作用的建模的重要性。从长远考虑，沙子回填土和粘土沟之间的界面建模很重要；然而，施工序列的建模并非如此。棱镜负载似乎为长期负载提供了更好的结果。由于回填后拱效应的强烈影响，现有的解析解决方案无法准确估计短期内窄沟槽的垂直荷载和管道挠度。从长远来看，爱荷华州公式以 0.40–0.52 的比率低估了水平管道挠度，这与挠度滞后因子相对应 沙子回填土和粘土沟之间界面的建模很重要；然而，施工序列的建模并非如此。棱镜负载似乎为长期负载提供了更好的结果。由于回填后拱效应的强烈影响，现有的解析解决方案无法准确估计短期内狭窄沟槽的垂直载荷和管道挠度。从长远来看，爱荷华州公式以 0.40–0.52 的比率低估了水平管道挠度，这与挠度滞后因子相对应 沙子回填土和粘土沟之间界面的建模很重要；然而，施工序列的建模并非如此。棱镜负载似乎为长期负载提供了更好的结果。由于回填后拱效应的强烈影响，现有的解析解决方案无法准确估计短期内窄沟槽的垂直荷载和管道挠度。从长远来看，爱荷华州公式以 0.40–0.52 的比率低估了水平管道挠度，这与挠度滞后因子相对应 由于回填后拱效应的强烈影响，现有的解析解决方案无法准确估计短期内窄沟槽的垂直荷载和管道挠度。从长远来看，爱荷华州公式以 0.40–0.52 的比率低估了水平管道挠度，这与挠度滞后因子相对应 由于回填后拱效应的强烈影响，现有的解析解决方案无法准确估计短期内窄沟槽的垂直荷载和管道挠度。从长远来看，爱荷华州公式以 0.40–0.52 的比率低估了水平管道挠度，这与挠度滞后因子相对应D _L为 1.9–2.5。从这项研究中获得的窄沟渠的时滞为 1.6-1.9，宽沟渠的时滞变小。