本文關(guān)鍵詞： 三軸試驗(yàn) 堆石料 殘余變形 數(shù)值分析　出處：《大連理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：我國土石壩主要建設(shè)在地震基本烈度高、地質(zhì)條件復(fù)雜、水資源豐富的西南地區(qū),如果遭受震害將造成巨大損失。已有的資料顯示大多數(shù)震害都與殘余變形有關(guān),因此需要深入研究筑壩堆石料的殘余變形特性。如何預(yù)測壩體的殘余變形已成為土石壩設(shè)計(jì)中的一個(gè)關(guān)鍵問題。 目前國內(nèi)外眾多學(xué)者已經(jīng)在殘余變形方面做了大量研究分析工作,主要的方法是通過大量的試驗(yàn)來建立能反映堆石料殘余變形特性的計(jì)算模型,從而對土石壩進(jìn)行計(jì)算分析。不同殘余變形模型考慮的影響因素不同,將導(dǎo)致其計(jì)算結(jié)果存在一定差異,計(jì)算模型不僅要能考慮不同振次、不同圍壓、不同應(yīng)力水平等試驗(yàn)條件,而且模型本身必須概念清晰,應(yīng)用簡捷,參數(shù)求取方便。 本文在國家自然科學(xué)基金“筑壩堆石料的剪脹特性及其對高面板堆石壩靜、動(dòng)力變形的影響研究”(編號：51279025)和“強(qiáng)震時(shí)超高面板壩面板破損機(jī)理及其抗震對策研究”(編號：51379028)、國家自然科學(xué)基金重大研究計(jì)劃集成項(xiàng)目“高土石壩地震災(zāi)變過程模擬與集成研究”(編號：91215301)、地震行業(yè)科研專項(xiàng)經(jīng)費(fèi)項(xiàng)目(編號：201208013)以及新世紀(jì)優(yōu)秀人才支持計(jì)劃“高土石壩和核電廠工程抗震”(編號：NCET-2012-12-0083)的資助下,就殘余變形模型目前存在的問題進(jìn)行了研究,主要工作如下： (1)利用大型靜、動(dòng)兩用三軸儀,對某擬建高面板堆石壩的筑壩材料進(jìn)行了大量的動(dòng)力循環(huán)三軸試驗(yàn),并整理出模型參數(shù),為數(shù)值分析提供依據(jù)。 (2)分析了堆石料殘余變形過程中泊松比的特性,泊松比在初始變化較大,但隨著振次或軸向應(yīng)變的增加泊松比的數(shù)值逐漸增大并趨于穩(wěn)定。根據(jù)試驗(yàn)結(jié)果整理出泊松比與動(dòng)應(yīng)力比、固結(jié)比、圍壓的關(guān)系以及其分布范圍。整理殘余剪應(yīng)變時(shí)不應(yīng)假定泊松比不變,應(yīng)根據(jù)體變和軸向應(yīng)變計(jì)算殘余剪應(yīng)變和循環(huán)剪應(yīng)變。 (3)整理、統(tǒng)計(jì)已有的殘余變形模型,針對已有模型存在的問題,提出采用雙曲線表述殘余應(yīng)變與振次的關(guān)系,分別在殘余體應(yīng)變關(guān)系式和殘余剪應(yīng)變關(guān)系式中引入平均主應(yīng)力和固結(jié)比,能更好地反映壩體的殘余變形特性。 (4)分別采用建議殘余變形模型與常用模型進(jìn)行數(shù)值模擬,分析了不同模型之間的差異,進(jìn)一步驗(yàn)證了本文提出模型的合理性。
[Abstract]:Earth-rock dams in China are mainly built in southwest areas with high earthquake intensity, complicated geological conditions and abundant water resources. If they are affected by earthquakes, they will cause huge losses. Most of the existing data show that most of the earthquake disasters are related to residual deformation. Therefore, it is necessary to deeply study the residual deformation characteristics of rockfill. How to predict the residual deformation of dam body has become a key problem in the design of earth-rock dam. At present, many scholars at home and abroad have done a lot of research and analysis on residual deformation. The main method is to establish a calculation model which can reflect the residual deformation characteristics of rockfill through a large number of experiments. Therefore, the calculation and analysis of earth-rock dam are carried out. Different residual deformation models consider different influencing factors, which will lead to some differences in calculation results. The calculation model should not only be able to consider different vibration times and confining pressures. Different stress levels and other test conditions, and the model itself must be clear concept, simple application, easy to obtain parameters. In this paper, the shear-dilatancy characteristics of rockfill materials for dam construction and its static effect on high face rockfill dam are studied by the National Natural Science Foundation of the people's Republic of China. Study on the influence of dynamic deformation "(No. 51279025) and" study on the damage Mechanism and Seismic Countermeasure of Ultra High face concrete face Dam under strong earthquake "(No. 51379028)," earthquake disaster process of High Earth-Rock Dam ", an Integrated Project of National Natural Science Foundation of China. Research on Simulation and Integration (No. 91215301), supported by a special research project for the earthquake industry (No.: 201208013) and the New Century Talent support Program, "Earth-Rock Dam and Nuclear Power Plant Project earthquake Resistance" (No.: NCET-2012-12-0083), The existing problems of residual deformation model are studied. The main work is as follows:. 1) A large number of dynamic cyclic triaxial tests are carried out on a dam material of a high face rockfill dam by using a large static and dynamic triaxial instrument, and the model parameters are sorted out, which provides a basis for numerical analysis. The characteristics of Poisson's ratio in the process of residual deformation of rockfill are analyzed. However, with the increase of vibration frequency or axial strain, the Poisson's ratio increases gradually and tends to be stable. According to the experimental results, the Poisson's ratio, the dynamic stress ratio and the consolidation ratio are sorted out. The relation of confining pressure and its distribution range. Poisson's ratio should not be assumed to be invariant in finishing residual shear strain, but residual shear strain and cyclic shear strain should be calculated according to bulk strain and axial strain. In order to solve the problems of the existing models, a hyperbolic method is proposed to describe the relationship between residual strain and vibration frequency. The average principal stress and consolidation ratio are introduced into the residual body strain relationship and the residual shear strain relationship, respectively, which can better reflect the residual deformation characteristics of the dam body. (4) the proposed residual deformation model and the common model are used to simulate the model, and the differences between different models are analyzed, which further verifies the rationality of the proposed model.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV41

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 孔憲京,張濤,鄒德高,婁樹蓮,徐斌;中型動(dòng)三軸儀研制及微小應(yīng)變測試技術(shù)應(yīng)用[J];大連理工大學(xué)學(xué)報(bào);2005年01期

2 孔憲京;鄒德高;周揚(yáng);徐斌;;汶川地震中紫坪鋪混凝土面板堆石壩震害分析[J];大連理工大學(xué)學(xué)報(bào);2009年05期

3 崔偉群,曾校豐;求取泊松比的理論探討[J];地學(xué)前緣;1998年04期

4 陳生水;沈珠江;;強(qiáng)震區(qū)域土石壩地震永久變形的計(jì)算[J];河海大學(xué)學(xué)報(bào);1990年02期

5 凌華;傅華;蔡正銀;劉漢龍;;壩料動(dòng)殘余變形特性試驗(yàn)[J];河海大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年05期

6 劉漢龍,余湘娟;土動(dòng)力學(xué)與巖土地震工程研究進(jìn)展[J];河海大學(xué)學(xué)報(bào)(自然科學(xué)版);1999年01期

7 鄒德高;畢靜;徐斌;孔憲京;趙陽;;加筋砂礫料殘余變形特性研究[J];水力發(fā)電學(xué)報(bào);2009年05期

8 遲世春,林皋,孔憲京;堆石料殘余體應(yīng)變對計(jì)算面板堆石壩永久變形的影響[J];水力發(fā)電學(xué)報(bào);1998年01期

9 沈珠江，，徐剛;堆石料的動(dòng)力變形特性[J];水利水運(yùn)科學(xué)研究;1996年02期

10 汪聞韶,金崇磐,王克成;土石壩的抗震計(jì)算和模型實(shí)驗(yàn)及原型觀測[J];水利學(xué)報(bào);1987年12期

相關(guān)博士學(xué)位論文 前1條

1 周揚(yáng);汶川地震紫坪鋪面板堆石壩震害分析及面板抗震對策研究[D];大連理工大學(xué);2012年

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