本文選題：地震動(dòng)力響應(yīng)規(guī)律 + 斜坡破壞失穩(wěn)機(jī)制��； 參考：《西南交通大學(xué)》2016年碩士論文

【摘要】：G318自上海至西藏樟木長(zhǎng)達(dá)5000多公里,西藏境內(nèi)G318沿線地質(zhì)災(zāi)害嚴(yán)重,以崩塌、滑坡、泥石流為主,同時(shí)發(fā)育雪崩、河岸坍塌和凍土凍融。其中林芝到波密段發(fā)育有典型的崩塌滑坡等地質(zhì)災(zāi)害,研究地震作用在本段路線引發(fā)的次生地質(zhì)災(zāi)害對(duì)沿線的災(zāi)害防治和公路鐵路的建設(shè)具有相當(dāng)重要的作用。本文基于自然基金項(xiàng)目《G318西藏林芝-波密段斜坡動(dòng)力響應(yīng)與滑坡啟動(dòng)機(jī)理研究》,在廣泛了解G318林芝到波密段的滑坡災(zāi)害,統(tǒng)計(jì)滑坡的主要地層結(jié)構(gòu)類型,建立相應(yīng)的數(shù)值模型,基于該段最典型的地層結(jié)構(gòu)類型,進(jìn)行地震動(dòng)力響應(yīng)的數(shù)值模擬計(jì)算,對(duì)比研究動(dòng)力響應(yīng)規(guī)律,分析其失穩(wěn)破壞機(jī)制,得到以下研究成果：1、土層斜坡坡面的動(dòng)力響應(yīng)規(guī)律為隨高度增加PGA放大系數(shù)隨之增大,且一定高度存在極值,坡體PGA放大系數(shù)基本呈現(xiàn)垂直放大效應(yīng)；坡體在震后并未失穩(wěn),而是在坡腳發(fā)生局部剪切破壞,這可能是研究區(qū)土層斜坡失穩(wěn)破壞的誘因。2、土層—巖層斜坡的失穩(wěn)破壞狀態(tài)為：土層為碎石土的斜坡在震后出現(xiàn)了兩條潛在滑帶,一條在滑體和基巖界面處,另一條則從滑體下10m左右形成一貫通的滑面；土層為冰磧土的斜坡震后在滑體與巖基界面處出現(xiàn)一貫通滑面。斜坡在坡面產(chǎn)生拉裂破壞,在滑體下部坡腳滑帶附件產(chǎn)生剪切破壞,土層為碎石土斜坡則在坡頂少量單元產(chǎn)生拉裂破壞。土層—巖層斜坡的動(dòng)力響應(yīng)規(guī)律為：坡面PGA放大系數(shù)隨高度增大,且在一定高度存在極值；坡體PGA放大系數(shù)表現(xiàn)為勻速的垂直放大效應(yīng),且千枚巖斜坡PGA放大系數(shù)更大；巖土接觸帶兩側(cè),土層與巖層的水平位移及加速度表現(xiàn)出明顯的差異響應(yīng),筆者認(rèn)為這是導(dǎo)致土層—巖層斜坡多在巖土接觸帶發(fā)生滑動(dòng)的根本原因,由于巖層與土層差異響應(yīng)導(dǎo)致變形不協(xié)調(diào)所致；水平位移及PGA放大系數(shù)土層為碎石土的斜坡明顯大于土層為冰磧土的斜坡,可見(jiàn),土層—巖層地層結(jié)構(gòu)斜坡的失穩(wěn)破壞程度更多受土層類型的控制。
[Abstract]:The length of G318 is more than 5000 kilometers from Shanghai to Tibet, and the geological hazards along G318 in Tibet are serious, such as collapse, landslide, debris flow, avalanche, river bank collapse and frozen soil freezing and thawing at the same time. There are typical geological disasters such as landslides and collapses in Linzhi to Bomi section. The study of secondary geological disasters caused by earthquake action in this section plays an important role in the disaster prevention and control along the route and the construction of highway and railway. Based on the research of slope dynamic response and landslide start-up mechanism of G318 Linzhi-Bomi section in Tibet, this paper, based on the natural fund project < G318, Tibet, has established a numerical model on the basis of a broad understanding of the landslide disasters in the G318 Linzhi to Bomi section, the main strata structure types of the landslide, and the corresponding numerical model. Based on the most typical stratum structure type, the seismic dynamic response is numerically simulated, the dynamic response law is compared and the failure mechanism is analyzed. The following research results are obtained: 1. The dynamic response law of the slope surface is that the PGA magnification coefficient increases with the height increasing, and there exists an extreme value at a certain height, and the PGA magnification factor of the slope body presents the vertical amplification effect basically, and the slope body does not lose stability after the earthquake. But local shear failure occurs at the foot of the slope, which may be the inducement of the instability of the soil slope in the study area. The failure state of the soil layer slope is as follows: there are two potential slip zones after the earthquake on the slope whose soil layer is gravel soil. One is at the interface between the sliding body and the bedrock, the other is formed a through slip surface from the slip body about 10 m below, and the slope of the soil layer is the moraine soil which appears a penetrating slip surface at the interface between the sliding body and the rock foundation after the earthquake. The slope has tensile failure on the slope, shear failure at the bottom of the slip zone, and tensile failure on the slope with a small number of elements at the top of the slope. The dynamic response of soil and rock slopes is as follows: the PGA magnification coefficient of slope surface increases with height, and there exists an extreme value at a certain height, the PGA magnification factor of slope body shows the vertical amplification effect of uniform velocity, and the PGA magnification factor of phyllite slope is larger than that of phyllite slope. On both sides of the contact zone, the horizontal displacement and acceleration of soil layer and strata show obvious difference response. The author thinks that this is the fundamental reason for the slope sliding in the contact zone between soil and rock. The horizontal displacement and PGA magnification coefficient of the slope is obviously larger than that of the slope of the moraine soil, so the horizontal displacement and PGA magnification coefficient of the slope are obviously larger than the slope of the moraine soil. The failure degree of soil-rock structure slope is more controlled by soil type.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：P315.9

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