【摘要】：隨著國民經(jīng)濟的飛速發(fā)展，我國涌現(xiàn)出新的建設(shè)高潮，如高速公路網(wǎng)、高等級公路網(wǎng)、高速鐵路網(wǎng)、水利水電、港口碼頭以及房地產(chǎn)項目等建設(shè)。在這些項目建設(shè)過程中，邊坡問題隨處可見，且我國每年因滑坡問題造成巨大的經(jīng)濟損失和人員傷亡。由于降雨和蒸發(fā)周期性循環(huán)、地下水遷移、庫水位周期性升降使得許多邊坡工程處于復(fù)雜的干濕循環(huán)交替環(huán)境之中，而這種環(huán)境作用正是誘發(fā)許多土質(zhì)邊坡發(fā)生滑坡災(zāi)害的重要原因。 本文結(jié)合高等學(xué)校博士學(xué)科點專項科研基金（20110191120033）和中央高�；究蒲袠I(yè)務(wù)費科研專項自然科學(xué)類項目資助（CDJZR12200012），通過室內(nèi)試驗，理論研究和數(shù)值模擬等方法從細觀力學(xué)的角度出發(fā)，研究粉質(zhì)粘土在干濕循環(huán)作用下的強度劣化規(guī)律、土質(zhì)邊坡失穩(wěn)判據(jù)，以及土質(zhì)邊坡顆粒流強度折減法。主要研究成果如下： ①通過粉質(zhì)粘土的室內(nèi)試驗研究，獲得宏觀力學(xué)參數(shù)偏應(yīng)力q隨軸應(yīng)變1的變化規(guī)律，，偏應(yīng)力峰值隨干濕循環(huán)次數(shù)增加減��；以及干濕循環(huán)作用下的粉質(zhì)粘土強度參數(shù)c，的變化規(guī)律，c值隨干濕循環(huán)次數(shù)增加減小，而值相對平穩(wěn)。 ②基于試驗分析與顆粒流理論，建立粉質(zhì)粘土宏觀力學(xué)參數(shù)與細觀力學(xué)參數(shù)的對應(yīng)關(guān)系，通過數(shù)值試驗獲得粉質(zhì)粘土的細觀參數(shù)，對細觀力學(xué)下的粉質(zhì)粘土強度變化規(guī)律與宏觀參數(shù)變化規(guī)律作對比分析。具體表現(xiàn)為摩擦力系數(shù)和粘結(jié)強度收到不同程度的劣化，而顆粒間的摩擦力系數(shù)和法向粘結(jié)強度受到劣化程度較小，切向粘結(jié)強度受到的劣化程度十分顯著，這與室內(nèi)實驗結(jié)果十分吻合。 ③在前人對安全系數(shù)定義法和失穩(wěn)判據(jù)研究的基礎(chǔ)上，基于顆粒流法理論，提出了細觀力學(xué)下粉質(zhì)粘土邊坡的失穩(wěn)判據(jù)和邊坡穩(wěn)定的安全系數(shù)計算方法，列舉一個經(jīng)典算例對其進行了驗證。 ④對四川境內(nèi)一長期處于干濕交替循環(huán)作用下的粉質(zhì)粘土邊坡進行分析，由其宏觀力學(xué)參數(shù)反算出細觀力學(xué)參數(shù)，用顆粒流折減系數(shù)法對邊坡的安全系數(shù)進行計算，并分析邊坡的失穩(wěn)全過程。
[Abstract]:With the rapid development of national economy, there is a new construction climax in China, such as highway network, high grade highway network, high-speed railway network, water conservancy and hydropower, port and wharf, real estate projects and so on. In the construction of these projects, slope problems can be seen everywhere, and the landslide causes huge economic losses and casualties in China every year. Because of the periodic circulation of rainfall and evaporation, the migration of groundwater and the periodic rise and fall of reservoir water level, many slope projects are in the complicated environment of alternate dry-wet cycle. And this kind of environment action is the important reason that induces many soil slope landslide disaster. In this paper, by means of laboratory test, theoretical research and numerical simulation, the author combines the special research fund of doctorate in colleges and universities (20110191120033) and the special natural science project (CDJZR12200012) of basic scientific research business expenses of central colleges and universities from the viewpoint of mesomechanics. This paper studies the law of strength deterioration of silty clay under dry and wet circulation, the criterion of soil slope instability, and the strength reduction method of soil slope particle flow. The main research results are as follows: 1 through the laboratory test of silty clay, the variation law of macroscopic mechanical parameter deviation stress Q with axial strain 1 is obtained, and the peak value of deflection stress decreases with the increase of dry and wet cycles; And the change rule of the strength parameter c of silty clay under dry and wet cycle is that c value decreases with the increase of dry and wet cycle times, but the value is relatively stable. 2 based on experimental analysis and particle flow theory, The relationship between the macroscopic mechanical parameters and the meso-mechanical parameters of silty clay was established. The meso-parameters of silty clay were obtained by numerical experiments, and the variation law of strength and macroscopic parameters of silty clay under micromechanics was compared and analyzed. The results show that the friction coefficient and bond strength are degraded to different degrees, while the friction coefficient and normal bond strength between particles are degraded to a lesser extent, and the tangential bond strength is obviously degraded. This is in good agreement with the results of laboratory experiments. 3 based on the previous researches on the definition of safety factor and the criterion of instability, based on the theory of particle flow method, The criterion of instability of silty clay slope under micromechanics and the method of calculating safety factor of slope stability are put forward. A classical example is given to verify it. (4) A silty clay slope in Sichuan is analyzed under the action of dry and wet alternating cycle for a long time, and the meso-mechanical parameters are calculated back from its macroscopic mechanical parameters. The safety factor of slope is calculated by particle flow reduction coefficient method, and the whole process of slope instability is analyzed.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU43

【參考文獻】

相關(guān)期刊論文 前10條

1 梁寧慧;劉新榮;陳建功;王永勇;;巖體滲透特性對邊坡穩(wěn)定性影響分析[J];地下空間與工程學(xué)報;2006年06期

2 劉傳平;王立;岳獻芳;尹少武;;顆粒流本構(gòu)關(guān)系的實驗研究[J];北京科技大學(xué)學(xué)報;2009年02期

3 欒茂田,武亞軍,年廷凱;強度折減有限元法中邊坡失穩(wěn)的塑性區(qū)判據(jù)及其應(yīng)用[J];防災(zāi)減災(zāi)工程學(xué)報;2003年03期

4 黃昌乾,丁恩保;邊坡穩(wěn)定性評價結(jié)果的表達與邊坡穩(wěn)定判據(jù)[J];工程地質(zhì)學(xué)報;1997年04期

5 唐芬;鄭穎人;;基于雙安全系數(shù)的邊坡穩(wěn)定性分析[J];公路交通科技;2008年11期

6 周健,池永;土的工程力學(xué)性質(zhì)的顆粒流模擬[J];固體力學(xué)學(xué)報;2004年04期

7 廖彪;劉忠;賀續(xù)文;;基于顆粒流的強度折減法分析勻質(zhì)土坡穩(wěn)定性[J];路基工程;2011年01期

8 周曉明;游啟升;吳蓋;;邊坡穩(wěn)定性分析方法述評[J];水利科技與經(jīng)濟;2007年09期

9 龍鵬偉;馬雙科;鄭亞娜;;基于顆粒流的容重增加對邊坡破壞模式影響研究[J];陜西水利;2011年01期

10 李凡;;巖土材料破損特性的顆粒流研究[J];土木工程學(xué)報;2007年09期

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