CAJ | 학술논문

采用动力强度折减法对水工隧洞进行了地震作用下稳定性数值计算分析，并进行了振动台模型试验，模拟了地震对隧洞的作用，得到了和数值计算一致的结果，对其进行了对比验证。结果表明：隧洞的破坏是一个渐变过程，首先在薄弱部位形成破裂区，逐渐扩大，直至破裂区贯通破坏；不同埋深隧洞在地震中的破坏形式不同，浅埋隧洞在其上方形成贯通到地面的破裂区，深埋隧洞在其周围形成贯通的破裂区，并不延伸到地面；隧洞的洞径对隧洞的动力稳定性影响较大，洞径增大1倍，安全系数降低45％左右。
채용동력강도절감법대수공수동진행료지진작용하은정성수치계산분석，병진행료진동태모형시험，모의료지진대수동적작용，득도료화수치계산일치적결과，대기진행료대비험증。결과표명：수동적파배시일개점변과정，수선재박약부위형성파렬구，축점확대，직지파렬구관통파배；불동매심수동재지진중적파배형식불동，천매수동재기상방형성관통도지면적파렬구，심매수동재기주위형성관통적파렬구，병불연신도지면；수동적동경대수동적동력은정성영향교대，동경증대1배，안전계수강저45％좌우。
Dynamic strength reduction method was used in the seismic stability numerical analysis for hydraulic tun-nel.Shaking table test modelling the effect of earthquake on tunnel was conducted to verify the result of numerical analysis.The test result were consistent with that of the numerical analysis.The results suggest that the destruction of the tunnel is a gradual process.First,damage zone appears at weak parts and then gradually expands until it penetrates through.The seismic failure modes are different when the tunnel depth is different:for shallow tunnel, the damage zone forms above the tunnel and penetrates to the ground;whereas for deep tunnel,the damage zone forms around the tunnel,and does not extend to the ground.Tunnel diameter has great impact on the dynamic sta-bility of the tunnel.As the tunnel diameter doubles,the safety factor reduces by about 45%.