朱晓良

摘 要：本文以苏州地铁8号线东延路站Ⅷ-KCWT03标段的管线沟槽加固施工为例，利用FLAC 3D软件，对沟槽回填加固支护过程进行模拟计算，并对沟槽开挖期间使用回填加固材料后的沉降位移进行模拟计算，然后与沟槽开挖期间未使用回填加固材料的情况进行对比，科学地论证了使用回填加固材料对管线沟槽回填的必要性。本次模拟计算使用的加固方案为“强弱”结构方案。经分析，随着沟槽的埋深增加，计算的数据结果与不采用加固方案的情况有着明显的差异，这些变化引起的差异处于预期的计算结果之内。将本次模拟的计算结果与实际工程数据相结合，分析对比可得，使用FLAC 3D对该工程实例的数值模拟是切合实际的，对沟槽开挖、基坑开挖等工程施工有一定的指导意义。施工之前，人们要利用数值模拟技术，对实际工程进行数值模拟;结合现场监测数据，分析沟槽回填加固后的变形和支护效果;运用相关理论知识，在保护周边建筑物的条件下得出沟槽回填的最佳方案，以确保实际工程的顺利进行。

关键词：数值模拟;管线沟槽;加固施工;FLAC 3D;工程实例;变形分析

中图分类号：U416.217文献标识码：A文章编号：1003-5168（2021）04-0124-04

Abstract： Taking the pipeline trench reinforcement construction in the section Ⅷ-KCWT03 of Dongyan Road Station of Suzhou Metro Line 8 as an example， this paper used FLAC 3D software to simulate the process of trench backfill reinforcement support， and simulated the settlement displacement after using the backfill reinforcement material during trench excavation， and then compared it with the situation when the backfill reinforcement material was not used during trench excavation， and scientifically demonstrated the necessity of using backfill reinforcement materials to backfill pipeline trenches. The reinforcement scheme used in this simulation calculation is the "strong and weak" structural scheme. After analysis， as the buried depth of the trench increases， the calculated data results are significantly different from the situation without the reinforcement scheme， and the differences caused by these changes are within the expected calculation results. Combining the calculation results of this simulation with actual engineering data， the analysis and comparison show that the numerical simulation of this engineering example using FLAC 3D is practical， which has certain guiding significance for the construction of trench excavation and foundation pit excavation. Before construction， people should use numerical simulation technology to simulate the actual project; combine the field monitoring data to analyze the deformation and support effect after the trench backfilling and reinforcement; apply relevant theoretical knowledge， come up with the best plan for trench backfilling under the condition of protecting the surrounding buildings to ensure the smooth progress of the actual project.

Keywords： numerical simulation;pipeline trench;reinforcement construction;FLAC 3D;engineering example;deformation analysis

隨着社会的不断进步，地铁的修建力度不断加大，对此地下管线的埋设就变得至关重要，地下管线种类繁多，结构复杂，因此管线沟槽的合理加固是保证管线正常运行的关键。在加固管线沟槽时，要铺设一定强度的混凝土，保证一定的地面强度，以免对地面造成破坏;在浇筑混凝土时，要设置弱结构面和松软结构层，以削弱路面的动力荷载和高温或冷冻天气带来的热胀冷缩自然现象。……