市政道路综合管沟的应力分布规律研究

以福建省平潭市政道路项目为依托，通过岩土有限差分软件FLAC3D建模，对综合管沟应力分布规律进行了研究。在所建模型中，包含9个关键位置。研究方法为:改变综合管沟上部荷载，监测每个位置各个方向的应力值（横向、竖向、纵向）；改变综合管沟埋深，监测其中3个关键位置的竖向应力值。研究结果表明:在综合管沟上端角部3个关键位置存在应力集中现象；估算或监测时，可以只考虑几个关键位置的竖向应力，减少工作量；适当增加管沟埋深，可以减少管沟应力集中现象。

Study on Stress Distribution Law of Utility Tunnel for Municipal Roads

Taking the municipal road project in Pingtan, Fujian Province as the background, the paper established a model by finite difference method Flac3D to study the stress distribution law of utility tunnel thereof. In the model established herein, there consists 9 key positions. Then the study was carried out in such manner that, change the upper load of the utility tunnel to monitor the stress in each direction (lateral, vertical and longitudinal) at each position; and change the buried depth of the utility tunnel to monitor the vertical stress at 3 key positions therein. The study results show that there exists stress concentration at 3 key positions at the upper cornor of utility tunnel; in the course of estimation or monitoring, it is only required to consider the vertical stress at several key positions to lessen the work load; and proper increase of the tunnel depth may reduce the stress concentration on the utility tunnel.