本文選題：順層巖質(zhì)邊坡　切入點(diǎn)：水平和豎向地震作用　出處：《土木工程學(xué)報(bào)》2017年10期

【摘要】：由于傳統(tǒng)順層巖質(zhì)邊坡地震可靠性分析往往是基于擬靜力法,忽略了地震的動力特性,而基于數(shù)值模擬軟件的地震時(shí)程分析法雖能考慮地震的動態(tài)性,卻相對費(fèi)時(shí)費(fèi)力,該文同時(shí)考慮了地震的動力特性和強(qiáng)度參數(shù)隨機(jī)性,提出順層巖質(zhì)邊坡動力可靠性分析方法。運(yùn)用Wilson-θ法和Matlab/Simulink工具建立了順層巖質(zhì)邊坡地震響應(yīng)簡化計(jì)算方法。根據(jù)響應(yīng)結(jié)果,運(yùn)用Monte Carlo法計(jì)算了邊坡的動力可靠度,并提出采用整體最小平均可靠度來評價(jià)邊坡的地震整體可靠性。在此基礎(chǔ)上,進(jìn)一步分析了水平和豎向地震作用的疊加模式對順層巖質(zhì)邊坡可靠性的影響。算例分析表明,提出的地震響應(yīng)簡化計(jì)算方法具有較高的計(jì)算精度和效率。該文可靠度分析方法低估了邊坡的地震可靠性。與水平地震作用相比,豎向地震作用對順層巖質(zhì)邊坡可靠性的影響也很明顯。常用的水平和豎向地震作用的峰值疊加模式并不能充分地體現(xiàn)出雙向地震的最大作用疊加效果,而采用雙向地震的最大作用疊加模式更偏于工程安全。
[Abstract]:Because the traditional seismic reliability analysis of bedding rock slope is often based on pseudo-static method, the dynamic characteristics of earthquake are ignored. The seismic time-history analysis method based on numerical simulation software can consider the dynamic characteristics of earthquake, but it is relatively time-consuming and laborious. In this paper, considering the dynamic characteristics of earthquakes and randomness of strength parameters, a dynamic reliability analysis method of bedding rock slope is proposed. A simplified method for calculating seismic response of bedding rock slope is established by using Wilson- 胃 method and Matlab/Simulink tool. The dynamic reliability of slope is calculated by Monte Carlo method, and the global minimum mean reliability is proposed to evaluate the seismic reliability of slope. The effects of horizontal and vertical seismic superposition models on the reliability of bedding rock slopes are further analyzed. The simplified calculation method of seismic response has high accuracy and efficiency. The reliability analysis method underestimates the seismic reliability of slope. The effect of vertical earthquake on the reliability of bedding rock slope is also obvious. The commonly used peak stacking models of horizontal and vertical earthquakes can not fully reflect the maximum effect of bidirectional earthquakes. The maximum effect superposition mode of bidirectional earthquake is more inclined to engineering safety.
【作者單位】： 華中科技大學(xué);
【分類號】：TU457

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本文編號：1665212