苏州凤凰山连拱加小净距隧道计算

苏州市凤凰山隧道属于软弱围岩中浅埋大跨度连拱加小净距隧道，且隧道穿越凤凰山公墓区，隧道上方公墓密集，对隧道设计和施工技术要求很高。基于地层一结构法，用有限元对隧道施工过程进行模拟，重点分析了围岩位移场和应变场以及初期支护、锚杆和二次衬砌的受力，分析隧道横断面危险点，在设计中采取相应安全措施，并优化开挖工法，计算确定隧道爆破施工和机械开挖的埋深分界点。

Calculation Analysis of Multi-arch and Small Spacing Tunnels in Suzhou Fenghuang Mountain

Fenghuang mountain tunnels are shallow covered multi-arch and small spacing tunnels with large span in soft-weak surrounding rock,and tunnels under pass Fenghuang mountain cemetery on which graves are intensive. The project is very strict to design and construction.Based on layer-structure method,the construction is simulated by finite element method,and the displacement and strain of surrounding rock,the internal force of primary lining,anchor stocks and secondary lining are analyzed. The critical sections...