新建隧道对既有电缆隧道的影响规律及保护区范围分析

Influence Rule of New Tunnel on Existing Cable Tunnel and Protection Scope

电缆隧道建成后,周边新建工程将会对既有电缆隧道产生一定的影响。以宁波澄浪电缆隧道为例,分析了顶管电缆隧道的破坏模式,并结合实际工程和国内外相关规范,提出黏土地层中顶管电缆隧道的位移及附加荷载控制值;通过使用有限元软件Plaxis建立多个有限元模型,得到不同相对位置处的新建并行隧道对既有电缆隧道的影响规律,并以此为依据提出了电缆隧道的保护区范围。

The new buildings may exert influence on the adjacent existing cable tunnel. Ningbo Chenglang Cable Tunnel is taken as a case in the paper. The failure mode of pipe jacking cable tunnel is analyzed. And combined with engineering condition and relative national and other countries' standards, the control values of displacement and additional load of pipe jacking cable tunnel in clay formation are proposed. Several finite element models are setup by Plaxis to obtain the influence rule of new parallel tunnels at different locations on existing cable tunnel. Based on the rule, the protection area of cable tunnel is proposed.