CAJ | 학술논문

针对洞口段均质围岩仰坡和含软弱夹层仰坡2种工况，开展大型振动台模型试验，分析水平和竖向激振下仰坡加速度和洞口段仰坡模型土振动特性。研究结果表明：水平向激振时仰坡存在明显加速度放大效应，竖向激振对含软弱夹层仰坡的影响不可忽视；洞口段隧道衬砌各点加速度时程曲线不一致，衬砌结构受力状态复杂；在水平向激振作用下，均质仰坡模型土坡肩土体先出现张拉裂缝，而后坡肩土体局部出现倾倒崩塌，最后沿坡面滑落堆积；含软弱夹层仰坡坡脚土体先出现挤压破碎，而后坡顶表面沿软弱夹层位置出现张拉裂缝，上覆土体沿软弱夹层滑动，最后土体大规模崩塌、滑落。本文为山岭隧道洞口段边坡抗减震研究和设计提供参考。
침대동구단균질위암앙파화함연약협층앙파2충공황，개전대형진동태모형시험，분석수평화수향격진하앙파가속도화동구단앙파모형토진동특성。연구결과표명：수평향격진시앙파존재명현가속도방대효응，수향격진대함연약협층앙파적영향불가홀시；동구단수도츤체각점가속도시정곡선불일치，츤체결구수력상태복잡；재수평향격진작용하，균질앙파모형토파견토체선출현장랍렬봉，이후파견토체국부출현경도붕탑，최후연파면활락퇴적；함연약협층앙파파각토체선출현제압파쇄，이후파정표면연연약협층위치출현장랍렬봉，상복토체연연약협층활동，최후토체대규모붕탑、활락。본문위산령수도동구단변파항감진연구화설계제공삼고。
Large-scale shaking table experiments were carried out under the conditions of front slopes of tunnel entrance being in homogeneous rock strata and with weak intercalations respectively.The accelerations of the front slopes and the dynamic characteristics of the tunnel-entrance front-slope model under horizontal and verti-cal excitations were analyzed.The results show as follows:Under horizontal excitations the front slopes demon-strate obvious acceleration magnifying effects and the impact of vertical excitations on the front slopes with weak intercalations cannot be ignored;the time-histories curves of accelerations at different points of linings of tunnel entrance vary from one another and the stressed state of the lining structure is complicated;under the action of horizontal excitations,for the homogeneous front-slope model,tension cracks firstly emerge in the slope shoulders and then the shoulder soil mass falls and collapses locally,slides down the slope surface and fi-nally is pile up;however,for the front-slope model with weak intercalations,the toe soil mass is compressed and crushed first,then the top surface is tensioned and fissured along the location of weak interlayers and the o-verlying soil mass slides along the weak interlayers,and finally large-scale dilapidation and down-fall occur. This paper provides reference for antiseismic researchs and design of slopes of mountain tunnel entrances.