摘要
结合高速铁路南京越江方案分析了沉管隧道水下基槽开挖后 ,水流通过基槽断面时的水头损失 ,获得了在忽略基槽内水流时形成的高压区 ,并分别对静水条件下的南京沉管隧道的典型断面 :粉砂层、粉细砂层边坡进行土工离心模型试验 ,得到粉砂层的极限坡率为 1∶1,细砂层的极限坡率接近 1∶2 ,而且水下边坡的破坏始于坡脚。在此基础上 ,对该问题进行了弹塑性有限元分析 ,结果表明水下边坡破坏同样始于坡脚 ,与试验相符。
For the underwater foundation ditch of the immersed tunnel excavated according to the plan of Nanjing immersed tunnel of high speed railway crossing Yantze River, the head loss of the flow across the foundation ditch section is analyzed, and a high pressure district is obtained with the flow in the foundation ditch being neglected. Centrifugal model tests of soil were performed on several typical sections of the immersed tunnel under the condition of still water, namely, on the silty sand slope and the silty fine sandy slope. The results show that the limit slope gradients of the silty sand layer and the fine sand layer is 1∶1 and is close to 1∶2 respectively, and that the damage of the underwater slope occurs at the bottom of the slope first. In addition, an elastic plastic FEM analysis of the problem was made, with a result also supporting the conclusion that the damage of the underwater slope occurs at the bottom of the slope first.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2002年第2期180-185,共6页
Journal of Southwest Jiaotong University
