Research and Application of Excavation Support Technology for Long and Large Tunnels in Fault Fracture Zones and Altered Rock Formations
During the excavation of the diversion tunnel of the Yingliangbao Hydropower Project,it encountered a fault fracture zones and altered rock formations of different sizes,where the stability was poor.If they were not properly controlled during construction,there would be various engineering geological problems such as rapid deformation,collapse,water gushing and mud bursting,which had a great impact on the construction pro-gress of the project.In this article,a series of measures are described during the excavation process of that strata of the diversion tunnel of the Yingliangbao Hydropower Project,such as reducing the disturbance of the fence,first advance support to increase the integrity of the surrounding rocks,using steel support anchor spra-ying in time after excavation,and controlling groundwater at the same time,in order to provide reference for the construction of fault fracture zones and altered rock formations in the excavation of similar long and large tunnels.
Yingliangbao Hydropower ProjectLong and large tunnelsFault fracture zonesAltered rock for-mationsExcavationSupport technology
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