【摘要】 为研究锚杆在地震作用下的动力响应,采用振动台进行锚杆支护岩质边坡模型试验。模型与原型相似关系按照重力相似律、相似比1∶10推导。输入Wolong、El Centro、Taft三种地震波,监测锚杆轴力、坡面加速度和位移时程,研究锚杆在地震作用下的受力机制、锚杆轴力分布规律、不同位置锚杆在地震作用下的动力响应差别。结果表明:地震作用下锚杆的轴力动力受力过程是由外向里;输入相同幅值的不同地震波,锚杆轴力动力响应不同;地震波强度较小时,位于边坡腰部锚杆的轴力最大,但随着地震波强度的增大,坡顶锚杆轴力增加较快,与边坡腰部锚杆轴力均为最大。研究结果为更加合理的进行锚杆抗震设计提供良好的基础。更多还原

【Abstract】 In order to study the dynamic responses of anchor bars under earthquake,shaking table is adopted in the simulation experiments of rock slope supported by anchor bars.The similarity between the model and the prototype is in accordance with the similarity law of gravity and the similar ratio is 1∶10.The mechanism behavior of anchor bars under earthquake,the distribution of the axial force of anchor bars and the difference of dynamic response of anchor bars in different location are studied through inputting three kinds of seismic waves of Wolong,El Centro and Taft and monitoring the axial force of anchor bars,the acceleration on the slope and the displacement of time history.The results show that the force on the axial under earthquake develops from the outside to the inside,and different seismic waves with the same amplitude result in different dynamic response.When the seismic wave is little,the axial force of the anchor bars in the middle slope is maximum,which with the increase of the strength of seismic wave,the axial force of the anchor bars on the slope top increases most rapidly and the force of the anchor bars in the milled of the slope is also at maximum.The results provide a reasonable foundation for the design of the anchor bars supporting under earthquake.更多还原