【摘要】：以三峽庫(kù)區(qū)某庫(kù)岸滑坡為模型,進(jìn)行地震作用下的動(dòng)態(tài)響應(yīng)分析。綜合運(yùn)用Geo-Studio中Quake、Seep、Slope模塊,分析庫(kù)岸滑坡地震作用下的動(dòng)態(tài)響應(yīng)。結(jié)果表明:(1)滑坡在地震作用下,出現(xiàn)一個(gè)類似于"鞭梢效應(yīng)"的現(xiàn)象,上部表層振幅大于下部,且上下部存在變形不同步,整體呈現(xiàn)出"S"型變形跡象;(2)滑坡整體呈現(xiàn)出不同程度的加速度放大作用,且放大的程度和坡體地形起伏及整體坡度有關(guān);(3)庫(kù)岸前緣首先發(fā)生液化現(xiàn)象,隨著地震的持續(xù),液化區(qū)沿著滑面向上蔓延,而中部表層極難發(fā)生液化,最后后緣也呈現(xiàn)出局部液化或者微弱液化的趨勢(shì);(4)考慮超孔隙水壓力、地震慣性力及強(qiáng)度折減后的滑坡穩(wěn)定系數(shù)遠(yuǎn)小于1,滑面處平均加速度大于某一臨界值時(shí)會(huì)發(fā)生不可逆塑性變形。研究所得結(jié)果為水庫(kù)滑坡治理提供參考。
[Abstract]:The dynamic response analysis of a reservoir bank landslide in the three Gorges reservoir area was carried out under earthquake action. The dynamic response of landslide earthquake in reservoir bank is analyzed by using Quake,Seep,Slope module in Geo-Studio. The results show that: (1) under earthquake action, the landslide appears a phenomenon similar to "whipping effect", the amplitude of the upper surface layer is larger than that of the lower part, and the deformation of the upper and lower parts is out of sync, showing the "S" deformation sign as a whole; (2) the whole landslide shows different degree of acceleration amplification, and the degree of amplification is related to the topographic fluctuation and the overall slope of the slope; (3) the first liquefaction occurred in the front edge of the reservoir bank. With the continuation of the earthquake, the liquefaction zone spread along the sliding direction, but the surface layer in the middle area was very difficult to liquefy, and the final rear edge also showed a tendency of local liquefaction or weak liquefaction. (4) considering the excess pore water pressure, the landslide stability coefficient after seismic inertia force and strength reduction is far less than 1, and the irreversible plastic deformation will occur when the average acceleration of the slide surface is greater than a certain critical value. The results of the study provide a reference for the landslide treatment of the reservoir.
【作者單位】： 三峽大學(xué)土木與建筑學(xué)院;三峽地區(qū)地質(zhì)災(zāi)害與生態(tài)環(huán)境湖北省協(xié)同創(chuàng)新中心;湖北長(zhǎng)江三峽滑坡國(guó)家野外科學(xué)觀測(cè)研究站;三峽大學(xué)科技學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41302260) 三峽大學(xué)碩士學(xué)位論文培優(yōu)基金(2016PY014) 湖北省科技支撐計(jì)劃項(xiàng)目(2015BCE070) 湖北省自然科學(xué)基金創(chuàng)新群體項(xiàng)目(2015CFA025) 防災(zāi)減災(zāi)湖北省重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金(2016KJZ16)
【分類號(hào)】：P642.22

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本文編號(hào)：2358664