Analysis on the Swellability of Surrounding Rock of the Tunnel in the Bid Ⅲ of Tingzikou Irrigation Area Fase Ⅰ
The Bid Ⅲ of Tingzikou Irrigation Area Fase Ⅰ Project is equipped with tunnels,aqueducts,open channels and other buildings.There are 25 tunnels,with a total length of about 41.8km,and the surrounding rock of the tunnel has a high proportion of class Ⅳ and Ⅴ,and the overall quality is poor.The surrounding rock of the tunnel is mainly composed of silty mudstone and mudstone siltstone interlayer with different thick-ness.Among them,silty mudstone and argillaceous siltstone have the characteristics of weak permeability,strong hydrophilicity,water expansion,water loss shrinkage and dry cracking.In this paper,the expansion characteristics of surrounding rock are analyzed,and the expansion parameters of surrounding rock such as free expansion rate,saturated water absorption rate and expansion force are determined through tests,which pro-vides design basis for determining the thickness of the initial support and the reinforced concrete lining and re-inforcement of the tunnel.
Tingzikou Irrigation AreaSurrounding rock of tunnelFree expansion rateSaturated water absorp-tionExpansive forceSwelling rock
国家科技期刊平台
NSTL
万方数据
维普
