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依据框架锚杆支护体系的作用机理,在建立分析模型时分为2步,即把框架锚杆支护边坡结构体系分为动土压力模型和框架锚杆支挡结构动力模型2部分。一是考虑坡高对动土压力分布的影响,认为地震时作用在支挡结构上的土压力,在支挡结构顶部最大,向下逐渐减小,呈倒三角形分布。二是基于Penzien提出的集中质量法,将框架结构离散化为质点串,而锚杆以弹簧支座形式将框架与土体进行连接,取一榀框架柱为计算单元,建立相应的动力模型控制方程,通过振型分析建立振型方程,并求解振型反应。通过对动土压力的求解和框架结构振型反应的分析,可以得到框架各结点处的支座反力,从而为框架锚杆支护边坡的抗震设计提供一定的依据。
According to the action mechanism of the framework bolt support system, the analysis model is divided into two steps when the analysis model is established. That is, the structural system of the rock bolt support is divided into two models: the earth pressure model and the dynamic model of the frame anchor support structure. Considering the effect of slope height on the distribution of earth pressure, it is considered that the earth pressure acting on the support structure during earth-quakes is the largest at the top of the support structure and decreases downwardly in the shape of an inverted triangle. The second is based on Penzien’s centralized mass method, which discretizes the frame structure into particle strings. The bolt connects the frame with the soil in the form of a spring bearing, and takes a frame column as the calculation unit to establish the corresponding dynamic model control Equation, the mode shape equation is established by mode shape analysis, and the mode shape reaction is solved. By solving the earth pressure and analyzing the vibration response of the frame structure, the reaction force of the support at each node of the frame can be obtained, so as to provide a basis for the seismic design of the slope supporting the frame anchor.