高地压应力强膨胀性围岩中隧道施工优化技术

强膨胀岩在深埋高地应力作用下,经过应力的重新分布,会对隧道结构产生强大的"膨压"作用。以被称为"西南第一难隧"的四角田隧道为施工对象,从隧道开挖断面选择、初支、二衬、监控测量等方面,结合"新奥法"设计理念,阐述了高地应力作用下强膨胀岩隧道施工技术。是"新奥法"灵活运用的一个展现。

Tunnel Construction under High Ground Pressure and High-expansion Wall Rock

After a tunnel is excavated,the stress distribution of high-expansion wall rock should be changed,thus pushing the tunnel structure.Combined with the construction of Sijiaotian Tunnel which is the most formidable in the south-west section of China,the optimized construction technique is introduced here along with the excavation section's choice,initial supporting,secondary supporting and monitoring measurement using NATM.