本文關(guān)鍵詞： 斜坡 地震動(dòng)力響應(yīng) 地層結(jié)構(gòu) 數(shù)值模擬　出處：《西南交通大學(xué)學(xué)報(bào)》2017年03期 　論文類(lèi)型：期刊論文

【摘要】：斜坡地層結(jié)構(gòu)及地震動(dòng)力響應(yīng)是斜坡失穩(wěn)破壞的重要因素.為進(jìn)一步研究斜坡地震動(dòng)力響應(yīng)的差異性及地震動(dòng)力響應(yīng)規(guī)律,以G318林芝—波密段典型斜坡中的四類(lèi)地層結(jié)構(gòu)斜坡為原型,利用FLAC3D建立斜坡數(shù)值分析模型,通過(guò)在坡面及坡體設(shè)置監(jiān)測(cè)點(diǎn),輸入Kobe地震波,對(duì)監(jiān)測(cè)點(diǎn)的應(yīng)變、水平位移及加速度等動(dòng)力響應(yīng)進(jìn)行分析研究.結(jié)果表明:土層-巖層斜坡的坡面PGA(peak ground acceleration,PGA)放大系數(shù)隨高度增加而增大,且在一定高度存在極值;坡體PGA放大系數(shù)與坡高呈線性增加,且千枚巖斜坡PGA放大系數(shù)更大,最大可達(dá)10.7;巖土接觸帶兩側(cè),土層與巖層的水平位移差異明顯,兩者至少相差一個(gè)數(shù)量級(jí),導(dǎo)致巖土接觸帶兩側(cè)介質(zhì)變形不協(xié)調(diào),這是土層-巖層斜坡在巖土接觸帶發(fā)生滑動(dòng)的主要原因;不同土層斜坡的水平位移及PGA放大系數(shù)也有很大不同,且土層-巖層地層結(jié)構(gòu)斜坡的失穩(wěn)破壞程度主要受土層類(lèi)型的控制.
[Abstract]:Slope formation structure and seismic dynamic response are important factors of slope failure. In order to further study the difference of slope seismic dynamic response and seismic dynamic response law. Taking four types of stratigraphic structural slopes in the typical slope of Linzhi Bomi section G318 as the prototype, the slope numerical analysis model is established by using FLAC3D, and monitoring points are set up on the slope surface and slope body. Input Kobe seismic wave, strain to monitoring point. The dynamic responses such as horizontal displacement and acceleration are analyzed and studied. The results show that the slope of soil-rock slope is PGA(peak ground acceleration. The magnification coefficient of PGA increases with the increase of height, and there is an extreme value at a certain height. The PGA magnification factor of slope body increases linearly with the height of slope, and the PGA magnification factor of phyllite slope is larger, the maximum is 10.7; On both sides of the contact zone, the horizontal displacement of soil layer and rock layer is obviously different, and the difference between them is at least one order of magnitude, which leads to the medium deformation on both sides of the contact zone is not coordinated. This is the main reason for the slip of the soil-soil slope in the geotechnical contact zone. The horizontal displacement and PGA magnification factor of different soil slopes are also very different, and the degree of instability of the slope is mainly controlled by the type of soil layer.
【作者單位】： 西南交通大學(xué)土木工程學(xué)院;西藏大學(xué)工學(xué)院;西南交通大學(xué)地球科學(xué)與環(huán)境工程學(xué)院;廣西交通規(guī)劃勘察設(shè)計(jì)研究院有限公司;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(41462012) 陜西省引漢濟(jì)渭工程科技資助項(xiàng)目(YHJW-KY-007)
【分類(lèi)號(hào)】：P315.9;U416.1
【正文快照】： 國(guó)道G318林芝—波密段位于藏東南地區(qū),平均海拔達(dá)3 500 m,位于雅魯藏布江中下游,構(gòu)造活動(dòng)強(qiáng)烈,地形復(fù)雜,屬高山峽谷地貌,是西藏的主要牧業(yè)區(qū).由于特殊的地質(zhì)地理環(huán)境,研究區(qū)地質(zhì)災(zāi)害頻發(fā)且形式多樣,以崩塌、滑坡、泥石流為主[1].受當(dāng)?shù)貧夂颦h(huán)境影響,巖石風(fēng)化作用較為強(qiáng)烈,部分

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