Seismic Response Analysis of Granite Residual Soil Slops Considering the Effect of Water Content
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摘要:
基于室内直剪试验，得到不同含水率下花岗岩残积土的强度参数，并采用有限差分软件研究了花岗岩残积土边坡在不同含水率(13%、17%、21%、25%)和地震加速度峰值(0.05g、0.1g、0.2g、0.4g)下的位移场、加速度场和锚杆轴力变化规律。结果表明：在 EL 波作用下，边坡水平位移主要集中在残积土层内。含水率越高、地震峰值加速度越大，同一位置处坡体水平位移越大；PGA 放大系数随着坡高的增加而增大，且表现为趋表放大效应。含水率越高、地震峰值加速度越小，同一位置处 PGA 放大系数越大；预应力锚杆最大轴力位于锚头处，且轴力沿自由段变化较小，而在内锚段由始端向末端逐渐减小。含水率越高、地震峰值加速度越大，同一位置处锚杆轴力越大。当地震加速度峰值较小时(PGA=0.05g)，坡脚处锚杆轴力最大，当地震加速度峰值较大时(PGA=0.4g)，坡顶处锚杆轴力最大。
Abstract:
Based on the laboratory direct shear tests， the strength parameters of granite residual soil at different water contents were obtained， and the finite difference software was used to study the dis- placement field， acceleration field and axial force of anchor bolt of granite residual soil slope at differ- ent water contents (13%、17%、21%、25%) and peak seismic acceleration (0.05g、0.1g、0.2g、0.4g). The results show that the horizontal displacement of the slope is mainly concentrated in the residual soil layer under the action of EL wave. The higher the water content and the greater the seismic peak acceleration， the greater the horizontal displacement of the slope at the same location. The amplifica- tion coefficient of PGA increases with the increase of slope height and shows a superficial amplification effect. The higher the water content and the smaller the seismic peak acceleration， the larger the PGA amplification coefficient at the same position. The maximum axial force of the prestressed bolt is locat- ed at the anchor head， and the axial force changes little along the free section， while that of the inner anchor section decreases gradually from the beginning to the end. The higher the water content and the greater the seismic peak acceleration， the greater the axial force of bolt at the same position. When the peak seismic acceleration is small (PGA=0.05g)， the bolt axial force is the largest at the foot of slope. When the peak seismic acceleration is large (PGA=0.4g)， the bolt axial force is the largest at the top of slope.
