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目前对该结构的动力特性和工作机制的研究还不完善,为了能够准确、合理地对该新型边坡锚固结构地震作用进行分析与设计,深入开展其动力特性及抗震设计理论研究是非常必要的。在预应力锚杆锚固作用下,框架受力满足弹性地基梁工作原理,因此,采用Winkler弹性地基梁理论,建立地震作用下框架预应力锚杆边坡锚固结构的动力计算模型。考虑梁和挡土板的影响,推导出外框架–预应力锚杆–坡后土体三者协同工作的水平地震动力运动方程,获得解析解。最后,结合工程实例,采用本计算方法进行地震动力响应分析,并与数值模拟、振动台试验进行对比验证,结果吻合较好,表明提出的方法是有效、可靠的。通过对支护和未支护边坡分析发现该结构能够明显控制地震响应,抗震性能表现良好。提出的计算模型为框架预应力锚杆边坡锚固结构的地震动力分析与设计奠定理论基础。
At present, the research on the dynamic characteristics and working mechanism of the structure is not perfect. In order to analyze and design the seismic action of the new type of slope anchoring structure accurately and reasonably, it is very necessary to study the dynamic characteristics and seismic design theory deeply . Under the action of prestressed anchor, the force of the frame satisfies the working principle of the elastic foundation beam. Therefore, using the Winkler elastic foundation beam theory, the dynamic calculation model of anchor prestressed anchor slope structure is established. Considering the influence of beams and retaining plates, the equations of motion of horizontal seismic motion in which the outer frame, the prestressed anchor and the soil behind the slope are obtained, are derived and the analytic solution is obtained. Finally, with the engineering example, this method is used to analyze the dynamic response of the earthquake, and compared with the numerical simulation and shaking table test. The results are in good agreement, which shows that the proposed method is effective and reliable. Through the analysis of the supporting and unsupported slope, the structure can obviously control the seismic response and the seismic performance is good. The proposed calculation model lays the theoretical foundation for the seismic dynamic analysis and design of prestressed anchorage structure of rock slope.