摘   要：以湖南益阳市水网湖区综合管廊工程为例，结合益阳典型软土地质条件，对综合管廊关键节点的应力进行了分析。基于现场资料，采用有限差分软件FLAC3D进行综合管廊及场地土体的数值模拟，在此基础上分析了在路堤荷载及车辆荷载作用下综合管廊埋深、沟底碎石垫层及沟背回填土密实度这三个因素对综合管廊关键节点应力的影响。结果表明，综合管廊的关键节点应力随管廊埋深的增加而变大，是否设置管底碎石垫层及沟背换填土体模量对综合管廊关键节点的应力变化影响不大。

      Abstract：Taking construction of utility tunnel on the Shuiwanghu area of the Yiyang city in Hunan province as a study case and combined with the geological condition of typical soft soil in the Yiyang, the stress of the key nodes of the utility tunnel was analyzed. Based on the field date, the numerical simulation of utility tunnel and site soil was proposed by using the finite difference software Flac3D, and key node stress of utility tunnel was analyzed under the embankment load and vehicle load by taking burial depths of utility tunnel, gravel cushion and the modulus of backfill into consideration. The result show that the stress of key nodes of utility tunnel increases with increase of burial depths, and whether setting gravel cushion under the utility tunnel or not and the soil modulus has little influence on the variation of stress of key nodes of utility tunnel.