CAJ | 학술논문

为研究浅埋输水隧道内部流体对隧道地震响应的影响，考虑黏弹性人工边界、土壤的非线性、隧道结构刚度有效率及流-固耦合作用，建立了双线隧道-土体-流体相互耦合作用的力学模型。通过刚度折减试验得到衬砌环环向、径向、轴向刚度，进而引入正交各向异性连续材料作为衬砌材料模型。采用基于任意拉格朗日-欧拉（ALE）描述法的流-固耦合方法，对上海某大直径双线输水隧道在流体作用下的地震响应进行了分析。通过与等效密度法对比，验证耦合模型对于处理输水隧道多物质非线性耦合抗震问题的可行性。计算结果表明，在水平方向地震激励下，无论一致激励或是非一致激励流体对隧道地震变形和内力都有较大影响，但对位移影响较小；对于不同隧道内水量，隧道弯矩均集中于衬砌隧道45°交叉斜线位置；相比于一致激励，非一致激励增强隧道地震位移和变形响应是明显的。
위연구천매수수수도내부류체대수도지진향응적영향，고필점탄성인공변계、토양적비선성、수도결구강도유효솔급류-고우합작용，건립료쌍선수도-토체-류체상호우합작용적역학모형。통과강도절감시험득도츤체배배향、경향、축향강도，진이인입정교각향이성련속재료작위츤체재료모형。채용기우임의랍격랑일-구랍（ALE）묘술법적류-고우합방법，대상해모대직경쌍선수수수도재류체작용하적지진향응진행료분석。통과여등효밀도법대비，험증우합모형대우처리수수수도다물질비선성우합항진문제적가행성。계산결과표명，재수평방향지진격려하，무론일치격려혹시비일치격려류체대수도지진변형화내력도유교대영향，단대위이영향교소；대우불동수도내수량，수도만구균집중우츤체수도45°교차사선위치；상비우일치격려，비일치격려증강수도지진위이화변형향응시명현적。
In order to study the seismic response of shallow diversion tunnel considering sloshing amplitude of the water, an analytical model of tunnel-soil-fluid is proposed taking account of nonlinear material behavior of soil, viscoelastic artificial boundary, the effective rigidity ratios and fluid-solid coupling. Firstly, the hoop, radial and axial structural rigidities of tunnel lining are obtained by numerical rigidity reduction tests. Furthermore, the orthotropic material is used in tunnel lining model. As an application, the seismic responses of a project of large-diameter parallel diversion tunnels, which is one of the key projects in Shanghai, are calculated using the multi-material arbitrary Lagrangian-Eulerian (ALE) method. The equivalent density method is then used to validate the established simulation model. Finally, two seismic input modes, the uniform and nonuniform excitations, are involved in the seismic analyses of the tunnel-soil-fluid system. The numerical results show that under horizontal earthquake excitation the influence of fluid on tunnel's displacement is small;however, the influences of fluid on both stress and deformation of the section are great. The tunnel moment are always focused on the position of the tunnel 45° cross-hatched. Comparing with the uniform seismic input, the results show that the nonuniform excitation can remarkably increase both displacement and deformation responses of the tunnel.