建設時からの一貫解析による既設山岳卜ンネルの盤ぶくれ予測と対策の評価法

摘要

Some mountain tunnels suffer from floor heave after their completion; and some of them require countermea-sures against it. in this study; first; the construction data of shinkan-sen tunnels suffering from floor heave are analyzed. second; tunnel construction; floor heave during service and its countermeasures are modeled for the numerical analysis. additionally; the effect of the items of the specification of downward rock bolts such as the number of bolts; their diameter; length and the value of prestress are evaluated quantitatively. as a resu it has been found out that with respect to the application of rock bolts as countermeasures against the floor heave during service; well-balanced specifications of the bolts considering the surface bonding and yielding of the bolts are important for securing the long-term performance of the countermeasures.%供用中の山岳トンネルの路盤部に地圧が作用し，長期にわたつて徐々に路盤が隆起することがある。この路盤の隆起（盤ぶくれ）は何らかの対策をしない限り，その進行が自然に収束することはほとんどない。