【摘要】：Newmark永久位移是評(píng)價(jià)邊坡在地震時(shí)穩(wěn)定性的一個(gè)重要指標(biāo),近年來(lái)廣泛應(yīng)用于地震邊坡危險(xiǎn)性評(píng)價(jià)中。傳統(tǒng)Newmark永久位移法在計(jì)算臨界加速度時(shí)假定其為常數(shù),未考慮滑動(dòng)面上抗剪強(qiáng)度參數(shù)的變化,過(guò)低估計(jì)了邊坡的永久位移。為了解決這一問(wèn)題,本文從巖土結(jié)構(gòu)理論獲得思路,詳細(xì)分析滑塊底面抗剪強(qiáng)度參數(shù)在地震中的變化過(guò)程,以邊坡震動(dòng)過(guò)程中黏聚力逐步喪失為基本思路,在黏聚力符合一定概率分布的基礎(chǔ)上,提出了一種利用蒙特卡羅法模擬其動(dòng)態(tài)減小過(guò)程從而實(shí)現(xiàn)臨界加速度動(dòng)態(tài)變化的計(jì)算方法。經(jīng)過(guò)算例計(jì)算,黏聚力和臨界加速度體現(xiàn)了地震過(guò)程中邊坡滑塊黏聚力和臨界加速度的動(dòng)態(tài)變化,位移大小符合地震邊坡實(shí)際位移的常規(guī)數(shù)值。本文提出的蒙特卡羅法實(shí)現(xiàn)動(dòng)態(tài)黏聚力和動(dòng)態(tài)臨界加速度的計(jì)算過(guò)程與地震時(shí)程相對(duì)應(yīng),不僅在一定程度上解決了抗剪強(qiáng)度參數(shù)的動(dòng)態(tài)變化問(wèn)題,還解決了傳統(tǒng)Newmark位移計(jì)算中永久位移比實(shí)際位移偏小的問(wèn)題。
[Abstract]:Newmark permanent displacement is an important index to evaluate slope stability during earthquake. It has been widely used in seismic slope risk assessment in recent years. The traditional Newmark permanent displacement method assumes that it is a constant when calculating the critical acceleration without considering the change of shear strength parameters on the sliding surface and underestimates the permanent displacement of the slope. In order to solve this problem, this paper obtains the train of thought from the geotechnical structure theory, analyzes in detail the variation process of shear strength parameters of the bottom surface of the slider in the earthquake, and takes the gradual loss of the cohesive force in the course of the vibration of the slope as the basic train of thought. On the basis of a certain probability distribution of the cohesive force, a Monte Carlo method is proposed to simulate the dynamic decreasing process of the cohesive force, so as to realize the dynamic change of the critical acceleration. The numerical results show that the cohesive force and critical acceleration reflect the dynamic changes of the cohesive force and critical acceleration of the slope sliders in the course of earthquake, and the displacement is consistent with the normal value of the actual displacement of the seismic slope. The Monte Carlo method proposed in this paper corresponds the calculation process of dynamic cohesive force and dynamic critical acceleration with the seismic time history, which not only solves the problem of dynamic variation of shear strength parameters to a certain extent, but also solves the problem of dynamic variation of shear strength parameters to a certain extent. It also solves the problem that the permanent displacement is smaller than the actual displacement in the traditional Newmark displacement calculation.
【作者單位】： 四川大學(xué)水力學(xué)與山區(qū)河流開(kāi)發(fā)保護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室水利水電學(xué)院;中國(guó)長(zhǎng)江三峽集團(tuán);四川大學(xué)-香港理工大學(xué)災(zāi)后重建與管理學(xué)院;
【基金】：NSFC國(guó)際合作項(xiàng)目(41661134012) 國(guó)家自然科學(xué)基金(51509173)
【分類號(hào)】：TU435

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