随机地震作用下框架锚杆锚固边坡稳定性可靠度分析
发布时间：2018-12-11 10:19
【摘要】：为了能够准确进行随机地震作用下框架锚杆锚固边坡的稳定性评价,开展其稳定性评价方法及可靠性抗震设计理论研究,将坡后土体考虑为弹性体,建立了坡后土体动力计算模型,将地震激励视为随机变量,采用虚拟激励法求得边坡随机地震反应,获得了边坡地震加速度反应功率谱,给出了最危险滑移面确定的极限状态方程和稳定性可靠度计算方法。将提出的计算方法应用于工程实例,运用可靠度理论分析了地震加速度的分布特征对支护边坡稳定性的影响和最小稳定系数的变化规律,进行了随机地震动力反应分析及稳定性可靠度计算,并采用Monte Carlo法验证了提出方法的有效性。结果表明:提出的分析模型物理概念明确,是一种快速、精确、实用的分析方法;提出的方法为框架预应力锚杆支护边坡的稳定性可靠度计算提供了理论依据和一种新的计算途径。
[Abstract]:In order to accurately evaluate the stability of frame Anchorage slope under random earthquake, the method of stability evaluation and the theory of reliability seismic design are carried out, and the soil behind the slope is considered as an elastic body. The dynamic calculation model of soil after slope is established. The earthquake excitation is regarded as a random variable, and the random seismic response of slope is obtained by virtual excitation method, and the power spectrum of seismic acceleration response of slope is obtained. The limit state equation and the method of calculating the stability reliability of the most dangerous slip plane are given. The proposed calculation method is applied to engineering examples and the influence of the distribution characteristics of earthquake acceleration on the stability of supporting slope and the variation law of minimum stability coefficient are analyzed by using the reliability theory. Random seismic dynamic response analysis and stability reliability calculation are carried out, and the validity of the proposed method is verified by Monte Carlo method. The results show that the physical concept of the proposed analytical model is clear, and it is a fast, accurate and practical analytical method. The proposed method provides a theoretical basis and a new approach for the calculation of the stability reliability of the frame prestressed anchor support slope.
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本文编号：2372368
[Abstract]:In order to accurately evaluate the stability of frame Anchorage slope under random earthquake, the method of stability evaluation and the theory of reliability seismic design are carried out, and the soil behind the slope is considered as an elastic body. The dynamic calculation model of soil after slope is established. The earthquake excitation is regarded as a random variable, and the random seismic response of slope is obtained by virtual excitation method, and the power spectrum of seismic acceleration response of slope is obtained. The limit state equation and the method of calculating the stability reliability of the most dangerous slip plane are given. The proposed calculation method is applied to engineering examples and the influence of the distribution characteristics of earthquake acceleration on the stability of supporting slope and the variation law of minimum stability coefficient are analyzed by using the reliability theory. Random seismic dynamic response analysis and stability reliability calculation are carried out, and the validity of the proposed method is verified by Monte Carlo method. The results show that the physical concept of the proposed analytical model is clear, and it is a fast, accurate and practical analytical method. The proposed method provides a theoretical basis and a new approach for the calculation of the stability reliability of the frame prestressed anchor support slope.
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本文编号：2372368
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