CAJ | 학술논문

深切谷坡浅表部卸荷裂隙发育，风化强烈，致使浅表层成为非连续介质及介质性质差异，地震动响应由此变得复杂。基于此，对适用于分析岩质边坡运动过程的不连续分析方法（DDA）进行改进，实现了地震波从模型底部输入，将其应用到四川青川东山斜坡中，通过与地震波的实地监测数据对比，揭示了高程、地形、山脊宽度以及“丁”字形山体等因素对地震波峰值加速度（PGA）放大的影响：相对谷底，当坡度一致时随高程增加地震波会出现放大，在坡折部位，由于地震波的反射及折射作用，PGA会得到放大，放大倍数达3．16倍；垂直单薄山脊方向上水平PGA放大明显，达4．64倍；“丁”字形山脊结合处，PGA放大倍数减小，约2倍。用改进后的DDA还模拟了四川汶川映秀“飞来石”临空抛射过程，认为“飞来石”形成的主要原因是斜坡中部古河道堆积物与单薄山脊的介质性质差异引起的放大效应。
심절곡파천표부사하렬극발육，풍화강렬，치사천표층성위비련속개질급개질성질차이，지진동향응유차변득복잡。기우차，대괄용우분석암질변파운동과정적불련속분석방법（DDA）진행개진，실현료지진파종모형저부수입，장기응용도사천청천동산사파중，통과여지진파적실지감측수거대비，게시료고정、지형、산척관도이급“정”자형산체등인소대지진파봉치가속도（PGA）방대적영향：상대곡저，당파도일치시수고정증가지진파회출현방대，재파절부위，유우지진파적반사급절사작용，PGA회득도방대，방대배수체3．16배；수직단박산척방향상수평PGA방대명현，체4．64배；“정”자형산척결합처，PGA방대배수감소，약2배。용개진후적DDA환모의료사천문천영수“비래석”림공포사과정，인위“비래석”형성적주요원인시사파중부고하도퇴적물여단박산척적개질성질차이인기적방대효응。
The high slope shallow slope unloading fracture,weathering is strong,and the play as a continuum and dielectric property difference,seismic response is complicated.This paper is suitable for the analysis of rock slope motion process of discrete analysis method (DDA)was improved,the seismic wave from the bottom of the model input,apply it to the Dongshan slope in Qingchuan of Sichuan,China compared with the monitoring data of seismic waves,reveals the elevation,topography,ridge width,and "ding"shaped mountains and other factors seismic peak ground acceleration (PGA)magnified impact:compared with the bottom,when the slope coincides with the elevation increased seismic waves will be amplified in the slope break site,due to seismic waves reflection and re-fraction,PGA will be amplified,magnification of 3.16 times;the vertical direction of the horizontal thin ridge PGA enlarged significantly,up to 4.64 times;"ding"shaped ridge junction,PGA magnification decreases about 2 -fold.Improved DDA was used to simulate the Yingxiu“flying stone”(in Wenchuan of Sichuan,China)airport mass ejection process,found that the slope in the middle of the ancient river deposits and medium difference caused by the amplification effect of thin mountain ridge is the main reason for the flying stone formation.