CAJ | 학술논문

根据动力模型试验的相似关系，制作1个尺寸为3.0 m×0.8 m×1.6 m (长×宽×高)坡角为40°的顺层模型边坡，设计传感器的布置和试验输入方案，并完成大型振动台试验。试验发现，在坡面上水平加速度随着坡高增加有明显的放大作用，并且该放大作用呈现出非线性和在不同高程的分段性特征，在坡高的1/3以下，加速度放大效应明显，在坡高2/3到坡顶处放大系数急剧增大，中间段水平加速度放大系数增长较为缓慢；在坡体内部竖直方向上，随着高程增加，加速度放大系也表现出非线性放大效应；在坡体水平方向上，在坡面一定深度内坡面处的加速度放大系数大于坡体内部，表现出趋表效应。根据破坏后的特征及试验过程中的视频回放和分析，得出模型边坡的滑动堵江机制为地震诱发→后缘松动拉裂→前缘剪切→高速下滑→对岸阻挡隆起→堆积坡脚→形成堰塞体。研究成果对地震灾区滑坡以及堰塞湖形成机制的认识和减灾防灾有一定的价值。
근거동력모형시험적상사관계，제작1개척촌위3.0 m×0.8 m×1.6 m (장×관×고)파각위40°적순층모형변파，설계전감기적포치화시험수입방안，병완성대형진동태시험。시험발현，재파면상수평가속도수착파고증가유명현적방대작용，병차해방대작용정현출비선성화재불동고정적분단성특정，재파고적1/3이하，가속도방대효응명현，재파고2/3도파정처방대계수급극증대，중간단수평가속도방대계수증장교위완만；재파체내부수직방향상，수착고정증가，가속도방대계야표현출비선성방대효응；재파체수평방향상，재파면일정심도내파면처적가속도방대계수대우파체내부，표현출추표효응。근거파배후적특정급시험과정중적시빈회방화분석，득출모형변파적활동도강궤제위지진유발→후연송동랍렬→전연전절→고속하활→대안조당륭기→퇴적파각→형성언새체。연구성과대지진재구활파이급언새호형성궤제적인식화감재방재유일정적개치。
According to dynamic model test similarity relation this paper constructed a bedding layered slope model with the physical dimension of 3.0 m(L)×0.8 m(W)×1.6 m(H) is carried out a large-scale shaking table test. And the testing results show that at the slope surface amplification effect is nonlinear and sectional,while below the 1/3 and over the 2/3 of slope height the amplifications are obvious. At the vertical direction in the slope, acceleration amplified with the slope height nonlinearly,and acceleration amplification coefficient reached to peak value at slope shoulder. At the horizontal direction,acceleration amplification coefficient at slope surface is larger than that in the slope,and it shows tend-surface effect. The mechanism of blocking the river is that arthquake inducing→tensile crack and loosen appeared of rear top→shear extrusion damage of foot of slope→high speed sliding→blocking of the opposite bank-accumulation at base of slope→formation of barrier dam.