Research on Lining Support Design Scheme for Gypsum Rock Tunnel in Deqin,Yunnan
In order to solve the design problem of highway tunnel engineering from G214 Gejiehe(Yunnan-Tibet boundary)to Deqin County in gypsum rock section,the geological survey and geotechnical test of gypsum rock section are carried out.It is determined that gypsum rock has the characteristics of easy dissolution,weak corrosion and expansibility.According to the characteristics of gyp-sum rock,the design scheme of double-layer initial sup-port composed of nearly circular inner contour,U-shaped steel and H-shaped steel is adopted.With the monitoring and measurement of surrounding displacement,vault sub-sidence,internal displacement of surrounding rock(setting points in the tunnel),pressure between two layers of sup-port,support and lining internal stress,it can well assist the construction of the second layer initial support of dou-ble-layer initial support.
tunnel support designtunnel engineeringgeological surveygypsum rock tunnellarge deformationsoft rock tunnel
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