Abstract

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Title:: Quality Characteristics and Optimization Selection of Arch Dam Foundation Rock Mass of Sanhekou Reservoir for Hanjiang-to-Weihe River Water Diversion Project, China

Author(s):: XING Ding-jia; XING Yi-hao; Shaanxi Province Institute of Water Resources and Electric Power Investigation and Design, Xi’an 710001, Shaanxi, China

Keywords:: arch dam; dam foundation; rock mass quality; exploration test; foundation plane; optimization; Hanjiang-to-Weihe river water diversion project

Abstract:: Study on the quality of dam foundation rock mass will help to reasonably select the foundation surface, and provide a scientific basis for engineering design, construction and safe operation. Taking the dam foundation rock mass of Sanhekou reservoir for Hanjiang-to-Weihe river water diversion project as the research object, the rock mass exposed by the dam foundation excavation was re-explored; meanwhile, the weathering characteristics, structural characteristics, relationship between longitudinal wave velocity and deformation modulus of dam foundation rock mass were elaborated comprehensively by using the test of the downhole television, longitudinal wave velocity, deformation modulus with prospecting holes; and the utilization of fault fracture zone and cataclastic rock of the dam foundation was analyzed emphatically, and a detailed engineering geological classification of dam foundation rock mass was discussed. Finally, the practical foundation surface is selected to raise elevation of the dam foundation plane from 501.0 m to 504.5 m, which optimizes the excavation depth of dam foundation, reduces the difficulty of dam foundation treatment and concrete pouring, and saves construction period and project investment.