CAJ | 학술논문

基于云南省S214思茅-江城二级公路某一边坡，利用有限差分软件FLAC3D中动力分析模块，研究了地震作用下锚杆支护的上覆红黏土岩体边坡的动力响应。基于土体与支护结构相互作用及其协同工作，建立了三维有限差分模型，给出了阻尼和动力作用下边界的选取方法，分析了地震作用下锚杆支护上覆红黏土岩体边坡的动力响应规律，研究了在地震作用下锚杆支护边坡的抗震效果。结果表明：地震作用后各层锚杆轴力和砂浆的剪应力都有所增大，但每层锚杆轴力的增幅都各不相同，锚杆轴力沿全长分布不均匀，且各层锚杆轴力均在红黏土与基岩的交界处最大，剪应力则表现为整体增大的趋势而且最大值向坡面靠近，地震作用前、后剪应力的最小值都是在红黏土与基岩的交界处；地震作用下锚杆的支护很好地限制了边坡的变形，加大了边坡的延性，具有很好的抗震性能；边坡在地震作用下产生了永久位移；坡体内加速度在竖向随高程增加而增大；平台的设置削弱了坡面加速度的增大趋势，起到了一定减震作用。研究结论对锚杆支护边坡的抗震设计与动力分析有一定参考价值。
기우운남성S214사모-강성이급공로모일변파，이용유한차분연건FLAC3D중동력분석모괴，연구료지진작용하묘간지호적상복홍점토암체변파적동력향응。기우토체여지호결구상호작용급기협동공작，건립료삼유유한차분모형，급출료조니화동력작용하변계적선취방법，분석료지진작용하묘간지호상복홍점토암체변파적동력향응규률，연구료재지진작용하묘간지호변파적항진효과。결과표명：지진작용후각층묘간축력화사장적전응력도유소증대，단매층묘간축력적증폭도각불상동，묘간축력연전장분포불균균，차각층묘간축력균재홍점토여기암적교계처최대，전응력칙표현위정체증대적추세이차최대치향파면고근，지진작용전、후전응력적최소치도시재홍점토여기암적교계처；지진작용하묘간적지호흔호지한제료변파적변형，가대료변파적연성，구유흔호적항진성능；변파재지진작용하산생료영구위이；파체내가속도재수향수고정증가이증대；평태적설치삭약료파면가속도적증대추세，기도료일정감진작용。연구결론대묘간지호변파적항진설계여동력분석유일정삼고개치。
Based on a slope located at the S214 Simao-Jiangcheng second class highway, the dynamic module of finite difference software FLAC3D is used to study the dynamic response of bolting shallow red clay slope under seismic loading. Based on the interaction and coordination of ground and supporting structure, a three-dimensional finite difference model which takes the damping and dynamic boundary into consideration is established. The dynamic response pattern of shallow red clay slope and the supporting effect of bolt under earthquake are analyzed. It is found that both the bolt axial force of each layer and the shear stress in mortar increase during earthquake. However, with variant increment in each layer of bolt axial force and uneven distribution along length direction, the axial force reaches maximum value at the junction of soil and bedrock. While the shear stress shows an overall increasing trend;and its peak value position approaches the slope surface. The minimum value positions of shear stress before and after earthquake are both located at the junction of soil and bedrock. Anchors’ support outstandingly constrains the deformation of slope and increases the ductility of ground under earthquake, which renders good aseismic behavior. Moreover, permanent displacement of slope is generated after the earthquake; and the seismic acceleration inside the slope increases with the raise of vertical elevation. While the platform setting weakens the increasing trend of slope surface acceleration, contributes in alleviating seismic effects. The research has certain reference value for seismic design and dynamic analysis of slope supported by anchor bolts.