摘要
随着上海城市轨道交通网络建设的密集化程度越来越大,运营轨道交通区间隧道与城市其他工程的交叉不可避免。在软土地区,区间上方大面积土体卸载会导致隧道结构上抬,土体开挖前需对盾构区间隧道采取保护措施,同时需优化施工工序,将土体卸载对区间隧道的附加影响降至最低。以上海轨道交通8号线浦东段某区间隧道上方河道开挖为工程背景,分析研究了轨道交通区间隧道的保护措施,通过三维有限元分析保护措施的有效性,确保轨道交通区间隧道附加位移在允许范围内。
With the increasing density of urban rail transit lines in Shanghai,it is inevitable that rail transit interval tunnels in operation intersect with the other projects.In the soft soil area,large soil unloading above interval tunnel will lead to the uplift of tunnel structure.Thus,before soil excavation,it is necessary to make protective measures for the bored interval tunnel,and optimize the construction process to minimize the additional impact of soil unloading on the tunnel.A river is excavated above an interval tunnel of Shanghai Rail Transit Line 8 in Pudong.Combined with this case,the protective measures for the interval tunnel are studied.The three-dimensional finite element analysis is applied to verify the effectiveness of protective measures,which ensures the additional displacement of the interval tunnel within the allowable range.
出处
《隧道与轨道交通》
2019年第4期47-51,58,共6页
Tunnel and Rail Transit
