本文關(guān)鍵詞： 地震動(dòng) 泥巖邊坡 有限元分析 摩擦角 坡角　出處：《重慶交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：地震是自然界里毀壞性極其慘重的自然災(zāi)害之一,一旦發(fā)生將會(huì)給我國造成大量財(cái)產(chǎn)損失和人員傷亡。最近幾年,我國西部地區(qū)的地震頻發(fā)、震級(jí)大、傷亡多、損失重、波及范圍廣。尤其是零八年發(fā)生的汶川大地震,造成了十萬多人的失蹤和死亡以及八千多億直接的財(cái)產(chǎn)損失。另外,我國西部地區(qū)的山區(qū)較多,地形地貌較復(fù)雜,大量基礎(chǔ)設(shè)施的建設(shè)過程中會(huì)遇到種類繁多的邊坡。所以,對(duì)防震和抗震的研究在巖土工程中具有重要的理論意義和應(yīng)用價(jià)值。本文主要以重慶江北區(qū)頭塘小學(xué)旁的泥巖邊坡作為研究背景。根據(jù)泥巖邊坡的實(shí)際情況。利用Midas/GTS有限元軟件對(duì)泥巖邊坡的地震反應(yīng)特性和抗震性能進(jìn)行分析,主要研究的內(nèi)容如下:①探討地震荷載的破壞機(jī)理和地震動(dòng)特性,分析影響邊坡動(dòng)力響應(yīng)的因素,為后續(xù)建立泥巖邊坡數(shù)學(xué)模型提供一定的理論依據(jù)。②結(jié)合江北區(qū)頭塘小學(xué)旁的泥巖邊坡具體實(shí)例,運(yùn)用有限元方法分析在不同強(qiáng)度地震作用下泥巖邊坡的動(dòng)力響應(yīng),得出泥巖邊坡的位移、最大剪切應(yīng)變隨著時(shí)間的變化云圖,分析各監(jiān)測(cè)點(diǎn)最值位移變化趨勢(shì),結(jié)果在一定程度上可以作為泥巖邊坡抗震設(shè)計(jì)的參考依據(jù)。③在同一地震荷載的作用下,對(duì)不同坡角、不同摩擦角的泥巖邊坡抗震性能進(jìn)行模擬,分析不同工況下其最大剪切應(yīng)變及最值位移的變化情況,為邊坡的安全性設(shè)計(jì)提供參考依據(jù)。④分別從水平方向不同角度輸入地震荷載時(shí),對(duì)泥巖邊坡進(jìn)行數(shù)值模擬,分析邊坡的動(dòng)力反應(yīng),并將邊坡上不同監(jiān)測(cè)點(diǎn)的最值位移進(jìn)行了對(duì)比分析。研究表明,從水平方向不同角度輸入地震波對(duì)邊坡動(dòng)力失穩(wěn)有顯著性差異,在多數(shù)情況下,沿水平垂直于斜坡方向輸入地震荷載對(duì)邊坡的動(dòng)力失穩(wěn)影響最大。⑤在分析大量的計(jì)算數(shù)據(jù)基礎(chǔ)上,提出一些提高泥巖邊坡抗震性能的建設(shè)性意見,為類似高邊坡設(shè)計(jì)和施工提供建設(shè)性參考。
[Abstract]:Earthquakes are one of the most devastating natural disasters in nature. Once they occur, they will cause a large number of property losses and casualties in our country. In recent years, earthquakes in the western region of China have occurred frequently, with a large magnitude, many casualties and heavy losses. The Wenchuan earthquake on 08, in particular, caused the disappearance and death of more than 100,000 people and the direct loss of more than 800 billion property. In addition, there are more mountainous areas in the western part of China, and the topography and landforms are more complicated. Many kinds of slopes will be encountered during the construction of a large amount of infrastructure. The research on earthquake prevention and seismic resistance has important theoretical significance and application value in geotechnical engineering. This paper mainly takes the mudstone slope beside Toutang Primary School in Jiangbei District of Chongqing as the research background, according to the actual situation of mudstone slope. The seismic response and seismic behavior of mudstone slope are analyzed by Midas/GTS finite element software. The main contents of this study are as follows: 1. The failure mechanism of earthquake load and the characteristics of ground motion are discussed, and the factors that affect the dynamic response of slope are analyzed. This paper provides a certain theoretical basis for the subsequent establishment of mathematical model of mudstone slope. 2 combined with the concrete example of mudstone slope next to Toutang Primary School in Jiangbei District, the dynamic response of mudstone slope under different earthquake intensity is analyzed by using finite element method. The deformation of mudstone slope and the maximum shear strain with time are obtained, and the variation trend of the maximum displacement at each monitoring point is analyzed. Results to some extent, it can be used as the reference for seismic design of mudstone slope. 3. Under the same earthquake load, the seismic behavior of mudstone slope with different slope angles and different friction angles can be simulated. The variation of maximum shear strain and maximum displacement under different working conditions is analyzed, which provides a reference for the safety design of slope. 4. When the seismic load is input from different angles in horizontal direction, the numerical simulation of mudstone slope is carried out. The dynamic response of the slope is analyzed, and the maximum displacement of different monitoring points on the slope is compared and analyzed. The results show that the seismic wave input from the horizontal direction has significant difference on the dynamic instability of the slope, and in most cases, On the basis of analyzing a large amount of calculation data, the author puts forward some constructive suggestions to improve the seismic behavior of mudstone slope. It provides a constructive reference for the design and construction of similar high slope.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU45

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本文編號(hào)：1539003