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基于块体动力学方法,考虑简谐振动地震波作用,根据Pseudo-static分析原理建立动力荷载下的锚杆支护边坡简化模型,采用解析方法对求得谐振作用下沿滑移面滑移的边坡破坏运动解以及锚杆内力解的表达式,在此基础上,提出可适用于抗震设计的锚杆受力解答。通过锚杆支护边坡的参数影响分析表明,地震波的频率对破坏体的滑动位移幅值有较大影响,在锚杆加固边坡设计中应避免免引起共振现象;锚杆间距对位移振动幅值影响也较大,随着间距的增大,位移幅值也增大;当锚杆间距一定时,随着坡高的增大,边坡滑动位移幅值增大幅度相较其他参数影响较小;随着边坡岩石边坡角度的增大,位移幅值也随之增大,下边坡角度从60°增大到90°时,位移幅值由7 cm增大到25 cm;上边坡坡度超过25°时,位移幅度急剧增大,在设计和施工中应当引起重视。
Based on the block dynamics method and considering the effect of simple harmonic seismic waves, a simplified model of rock bolt supported slope under dynamic load is established according to the principle of Pseudo-static analysis. The analytical method is used to obtain the slip of the slope along the slip surface Slope failure solution and the solution of the internal stress of the anchor, and on this basis, put forward a suitable solution to the seismic design of the anchor force. The analysis of the influence of the parameters of the slope supporting the bolt shows that the frequency of the seismic wave has a great influence on the magnitude of the sliding displacement of the failure body, and the avoidance of resonance must be avoided in the design of the slope reinforced by the bolt. The magnitude of displacement is larger, and the amplitude of displacement also increases with the increase of spacing. When the spacing of anchor is constant, with the increase of slope height, the amplitude of slope slip increases more than other parameters Smaller. As the slope angle of rock slopes increases, the displacement amplitude also increases. When the slope angle increases from 60 ° to 90 °, the displacement amplitude increases from 7 cm to 25 cm. When the slope gradient exceeds 25 °, the displacement amplitude increases sharply, which deserves attention in the design and construction.