Research on Construction Technology of Poor Geological Section of Red Layered Soft Rock Tunnel in Central Yunnan
The water diversion project in central Yunnan has a long route,spanning multiple geological structural units,and is widely affected by active faults,high groundwater,high stress,and large deformation of soft rocks.The red layered soft rock cave section in central Yunnan is concentrated on Dali and Chuxiong railway lines.Among them,the upstream control section of Fenghuangshan Tunnel inverted siphon traffic tunnel in Chuxiong section crosses the soft rock of the red layer in central Yunnan andYuanmou Lvzhi River fault zone.During the construction process of this section,the construction team fully utilized advanced geological forecasting,advanced support,reserved deformation,layered and segmented excavation,multiple support types,monitoring and measurement,and timely closure into a ring.It incorporates multiple control factors into excavation and support construction,increases tunnel stability,improves safety assurance rate,and forms a construction technology suitable for the unfavorable geological section of the red layer soft rock in central Yunnan.
red layered soft rock in central Yunnantunnelfault zoneexcavation supportconstruction technology
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