综合管廊埋深数值分析

Numerical Analysis on Buried Depth of Utility Tunnel

以福建省平潭市政道路项目为背景,通过岩土有限差分软件Flac3D建模,进行了综合管廊应力分布数值模拟。在所建模型中,包含4个关键位置。保持综合管廊上部荷载不变,改变综合管廊埋深,通过监测每个位置的竖向应力值,得出关键位置应力与埋深的估算关系式;保持综合管廊埋深不变,改变综合管廊上部荷载,通过监测每个位置的竖向应力值,得出关键位置应力与上部荷载的估算关系式。所得的两个估算式可供综合管廊设计及施工估算应力借鉴。

Based on the municipal road projects in Pingtan, Fujian Province, a numerical simulation model for stress distribution of utility tunnel based on the fast Lagrangian analysis of continua in three dimensions（FLAC3D） is established. In this model, there are 4 key positions. By changing the buried depth of utility tunnel, the vertical stress of each position is monitored. Then, an estimated formula is obtained, which shows the relation between the stress of key positions and the buried depths; by changing the upper load of utility tunnel, the vertical stress of each position is monitored. Then, an estimated formula is obtained, which shows the relation between the stress of key positions and the upper loads. The two estimated formulas can provide a reference for the design of utility tunnel and estimating stress in construction.