【摘要】：為了能夠準確進行隨機地震作用下框架錨桿錨固邊坡的穩(wěn)定性評價,開展其穩(wěn)定性評價方法及可靠性抗震設(shè)計理論研究,將坡后土體考慮為彈性體,建立了坡后土體動力計算模型,將地震激勵視為隨機變量,采用虛擬激勵法求得邊坡隨機地震反應(yīng),獲得了邊坡地震加速度反應(yīng)功率譜,給出了最危險滑移面確定的極限狀態(tài)方程和穩(wěn)定性可靠度計算方法。將提出的計算方法應(yīng)用于工程實例,運用可靠度理論分析了地震加速度的分布特征對支護邊坡穩(wěn)定性的影響和最小穩(wěn)定系數(shù)的變化規(guī)律,進行了隨機地震動力反應(yīng)分析及穩(wěn)定性可靠度計算,并采用Monte Carlo法驗證了提出方法的有效性。結(jié)果表明:提出的分析模型物理概念明確,是一種快速、精確、實用的分析方法;提出的方法為框架預(yù)應(yīng)力錨桿支護邊坡的穩(wěn)定性可靠度計算提供了理論依據(jù)和一種新的計算途徑。
[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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本文編號：2372368