地震作用下锚固滑坡动力响应研究  

Study on the Dynamic Response of Anchorage System under Earthquake

作　　者：李楠[1] 汪班桥[1] 门玉明[1] 程辉[1] 

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《防灾减灾工程学报》2017年第6期878-885,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(41440021;41572261);中央高校基本科研业务费专项资金项目(310826175029)资助

摘　　要：为研究地震作用下锚固滑坡的动力响应,开展大型振动台模型试验,以汶川波、El Centro波以及不同频率的正弦波为输入波,研究在逐级增大加载强度条件下锚固滑坡的动力特性、加速度响应及地震动参数对加速度响应的影响等动态响应特征。结果表明:①地震作用下,锚固滑坡的破坏形式主要为框架之外素土部分上部的张拉破坏和坡底的剪切破坏。②锚固滑坡对输入地震波具有放大作用,且沿坡高方向向上,PGA放大系数呈递增趋势。③不同类型的地震波作用时,由于其频谱特性的差异,锚固滑坡的加速度响应不同。低强度地震波作用时,输入波的频率越接近锚固体的自振频率,坡面加速度放大效应越强;高强度地震波作用时,输入波的频率越低,坡面加速度放大效应越强;低频波作用时,加载强度越大,坡面加速度放大效应越强;高频波作用时,加载强度越大,坡面加速度放大效应越弱。研究结果对锚固滑坡的抗震设计具有一定的参考意义。In order to study dynamic response of anchorage landslide under earthquake, large-scale shaking table model test is conducted. In this paper, sine wave, Wenchuan wave and E1 Centro wave as input seismic wave, dynamic properties of anchorage landslide, acceleration response and the effect of earthquake parameters on anchorage landslide are studied respectively. The results indicate that： （1）The main failure form of anchorage landslide under earthquake is tension destruc- tion in the upper and shearing destruction in the bottom outside frame beam. （2）The anchorage landslide has amplification effect on the input seismic wave, and PGA amplification coefficient in- creases from bottom to top along with the landslide. （3）Due to the earthquake spectrum character- istics, acceleration response is different under different seismic waves; Under low strength earth- quake, the closer to the natural frequency of anchorage landslide, the stronger the amplification effect will be, however, under high strength earthquake, the lower the frequency of the input wave, the stronger the amplification effect will be; Under low frequency wave, the stronger the loading earthquake, the stronger the amplification effect, while under high frequency wave, the stronger the loading earthquake, the weaker the amplification effect will be. The results could provide a reasonable foundation for the design of anchorage landslide.

关 键 词：锚固滑坡 地震 振动台 动力响应 加速度放大效应 

分 类 号：P642[天文地球—工程地质学]