Timing Analysis on Rock-bolted Crane Beam of the Underground Power House ofJinping II Hydropower Station

摘要

According to design requirements, to reduce the construction difficulty for crane beam on rock wall in underground main power house of Jinpingll hydropower, and to condense construction time limit for a main building, theconcreting time for crane beam on rock wall is needed to be specially analyzed. As the property of Jinpingll hydropower station is under high field stress, numeric analysis uses rock mass deterioration constitutive model RDM. Considering the special mechanics behavior between concrete and rock wall, softening element and interface element are used respectively to make the simulation. By analyzing the stress for different placement times of crane beam of main house, it is shown that placement timing has certain extent effect on upper stress of crane beam. As a result, in order to assure stability of constructing and operating periods of crane beam, the calculation and analysis suggest that the concreting should be after the third excavation, but certain structural joint need to be installed.