本文選題：脆性巖石 + 熱—力—損傷耦合　； 參考：《武漢大學(xué)》2013年博士論文

【摘要】：高放核廢料深地質(zhì)處置是一個關(guān)系到國計民生的綜合性問題,具有多學(xué)科交叉的特點。它對巖石力學(xué)工程領(lǐng)域提出了許多挑戰(zhàn)性的科學(xué)和技術(shù)課題,如復(fù)雜巖體及其賦存環(huán)境的熱-水-力耦合問題等。其中,脆性巖石的熱-力-損傷耦合問題作為復(fù)雜巖體多場耦合問題的一個重要方面也得到國內(nèi)外學(xué)者的重點關(guān)注。本文以國際合作研究計劃DECOVALEX-2011的B子課題“硬巖熱-力耦合作用研究”、國家優(yōu)秀青年科學(xué)基金項目“巖土體多場耦合效應(yīng)與滲流控制(No.51222903)”、國家自然科學(xué)基金面上項目“考慮多場耦合效應(yīng)的核廢料深地質(zhì)處置庫圍巖傳輸特性演化機(jī)制(No.51179136)"和國防科工委高放核廢料地質(zhì)處置研究項目“基于THMC耦合的高放廢物地質(zhì)處置安全性評價”為背景,以脆性巖石為研究對象,以脆性巖石熱-力耦合作用誘發(fā)的損傷過程及熱傳導(dǎo)特性演化規(guī)律為出發(fā)點,采用理論分析和試驗驗證相結(jié)合的方法,重點研究了溫度和應(yīng)力耦合作用下脆性巖石的損傷演化特性和熱傳導(dǎo)特性演化規(guī)律,分析了巖石在耦合作用下的熱能傳輸規(guī)律和漸進(jìn)破壞過程。論文的主要研究工作和成果概括如下： (1)研究了脆性巖石在開挖、熱應(yīng)力耦合條件下的宏細(xì)觀損傷機(jī)制。介紹了細(xì)觀力學(xué)均勻化方法,研究了含微裂紋脆性巖石宏觀有效彈性張量；將含微裂紋脆性巖石看作一個熱力學(xué)系統(tǒng),分析了描述巖石細(xì)觀損傷演化過程的基本內(nèi)變量,研究了非等溫條件下考慮熱-力耦合作用的細(xì)觀損傷力學(xué)模型；采用瑞典Aspo閃長巖的三軸壓縮試驗數(shù)據(jù)對細(xì)觀損傷力學(xué)模型有效性與合理性進(jìn)行了驗證。 (2)研究了多場耦合條件下脆性巖石有效熱傳導(dǎo)特性的演化機(jī)制。分析了巖石有效熱傳導(dǎo)系數(shù)的影響因素,包括巖石的礦物組成、孔隙率、飽和流體及飽和度、溫度和應(yīng)力等；介紹了巖石有效熱傳導(dǎo)特性的、Viener界限和Hashin-Shtrikman界限；將巖石表征單元體看作無限大基質(zhì)和非均勻橢球夾雜的混合物,從熱傳導(dǎo)問題基本方程出發(fā),運用細(xì)觀均勻化方法導(dǎo)出了有效熱傳導(dǎo)系數(shù)的一般表達(dá)式,并根據(jù)橢球夾雜問題基本解得到了基于不同均勻化方法的有效熱傳導(dǎo)特性張量；分析了有效熱傳導(dǎo)特性張量的Voigt界限和Reuss界限,討論了有效熱傳導(dǎo)張量的各向異性特征,分析了巖石有效熱傳導(dǎo)特性與結(jié)構(gòu)變化及損傷演化之間的內(nèi)在聯(lián)系；運用該模型研究了瑞典Aspo閃長巖在加載過程中的有效熱傳導(dǎo)特性的演化規(guī)律；基于膨潤土細(xì)觀結(jié)構(gòu)特征,采用細(xì)觀均勻化方法研究了我國高廟子膨潤土的有效熱傳導(dǎo)特性。 (3)研究了脆性巖石熱-力-損傷耦合數(shù)值分析方法。從不可逆熱力學(xué)的角度,考慮巖石在溫度和應(yīng)力作用下的損傷與有效熱傳導(dǎo)特性演化,基于等效連續(xù)介質(zhì)分析模型,建立了脆性巖石的熱-力-損傷耦合控制方程,采用Galerkin方法和有限差分法對控制方程組進(jìn)行離散,建立了有限元計算格式,研發(fā)了三維應(yīng)力場與溫度場耦合分析程序。 (4)結(jié)合國際合作項目DECOVALEX-2011計劃B子課題,開展了脆性巖石熱-力-損傷耦合數(shù)值模擬研究。介紹了在瑞典Aspo硬巖地下試驗室開展的APSE(Aspo Pillar Stability Experiment)巖柱穩(wěn)定性試驗：研究了在開挖應(yīng)力擾動和溫度擾動共同作用下試驗區(qū)域溫度場、應(yīng)力場和變形場的分布規(guī)律,揭示了試驗巖柱在熱-力耦合作用下的漸進(jìn)破壞規(guī)律。
[Abstract]:The deep geological disposal of high radioactive waste is a comprehensive problem related to the national economy and the people's livelihood. It has the characteristics of multidisciplinary and interdisciplinary. It has put forward many challenging scientific and technical topics in the field of rock mechanics engineering, such as the hot water force coupling problem of complex rock mass and its occurrence environment. As an important aspect of the multi field coupling problem of complex rock mass, it has also been paid more attention by scholars both at home and abroad. This paper, based on the B sub project of the international cooperative research program DECOVALEX-2011, "Research on the thermal force coupling of hard rock", the National Excellent Youth Science foundation project "multi field coupling effect and seepage control (No.51222903)", The project "the evolution mechanism of the surrounding rock transmission characteristics of nuclear waste deep geological disposal repositories considering multi field coupling effect (No.51179136)" and the project of high radioactive waste geological disposal research project of the national defense science and Technology Commission "based on THMC coupled high level waste geological disposal safety assessment" as the background, the research object of fragile rock as the research object. The damage process and the evolution of heat conduction characteristics are the starting point of the coupled thermal force coupling of brittle rocks. By combining theoretical analysis with experimental verification, the damage evolution and heat conduction characteristics of brittle rocks under the coupling of temperature and stress are studied, and the thermal energy of the rock under coupling is analyzed. The main research work and achievements are summarized as follows:
(1) the macro mesoscopic damage mechanism of brittle rock under the condition of excavation and thermal stress coupling is studied. The meso mechanical homogenization method is introduced, and the macroscopic effective elastic tensor of brittle rock with micro cracks is studied, and the brittle rock with micro cracks is considered as a thermodynamic system, and the basic internal variables describing the evolution process of the rock meso damage are analyzed. The mesoscopic damage mechanics model for thermal force coupling under non isothermal conditions is studied, and the validity and rationality of the meso damage mechanics model are verified by the three axial compression test data of the Swedish Aspo diorite.
(2) the evolution mechanism of effective heat conduction characteristics of brittle rocks under multi field coupling is studied. The factors affecting the effective thermal conductivity of rock are analyzed, including mineral composition, porosity, saturated fluid and saturation, temperature and stress, etc., and the effective heat conduction characteristics of rock, Viener boundary and Hashin-Shtrikman limit are introduced. The rock characterization unit is regarded as an infinite matrix and an inhomogeneous ellipsoid mixture. From the basic equation of the heat conduction problem, the general expression of the effective heat conduction coefficient is derived by the meso homogenization method, and the effective heat conduction tensor based on the inhomogeneous homogenization method is obtained according to the basic solution of the ellipsoid inclusion problem. The Voigt boundary and Reuss boundary of the effective heat conduction tensor are analyzed, the anisotropic characteristics of the effective heat conduction tensor are discussed, and the internal relations between the effective heat conduction characteristics of the rock and the structural changes and the damage evolution are analyzed. The effective heat conduction characteristics of the Swedish Aspo diorite during loading are studied by using the model. Based on the meso structural characteristics of bentonite, the effective heat transfer characteristics of high Miao Zi bentonite in China were studied by meso scale homogenization method.
(3) the numerical analysis method for the thermal force damage coupling of brittle rocks is studied. In the angle of irreversible thermodynamics, the damage and effective heat conduction characteristics of rock under the action of temperature and stress are considered. Based on the equivalent continuous medium analysis model, the coupling control equation of the thermal force damage of brittle rock is established, and the Galerkin method and the finite difference are adopted. Discrete method is used to discretize the governing equations, and the finite element calculation format is established, and the three-dimensional stress field and temperature field coupling analysis program is developed.
(4) combining the B sub project of the DECOVALEX-2011 project of the international cooperation project, the numerical simulation of the thermal force damage coupling of brittle rocks is carried out. The stability test of the APSE (Aspo Pillar Stability Experiment) rock column in the Aspo hard rock underground test room in Sweden is introduced. The experiment is carried out under the joint action of the stress disturbance and the temperature disturbance in the excavation. The distribution law of regional temperature field, stress field and deformation field reveals the progressive failure law of test rock column under thermo mechanical coupling.
【學(xué)位授予單位】：武漢大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU45

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王駒;徐國慶;金遠(yuǎn)新;;論高放廢物地質(zhì)處置庫圍巖[J];世界核地質(zhì)科學(xué);2006年04期

2 李錫夔,李榮濤,張雪珊,武文華;高溫下混凝土中熱—濕—氣—力學(xué)耦合過程數(shù)值模擬[J];工程力學(xué);2005年04期

3 李寧,陳波,陳飛熊;寒區(qū)復(fù)合地基的溫度場、水分場與變形場三場耦合模型[J];土木工程學(xué)報;2003年10期

4 王駒,劉月妙;高放廢物地質(zhì)處置與巖石力學(xué)研究[J];巖土力學(xué);2003年S2期

5 高小平,楊春和,吳文,劉江;溫度效應(yīng)對鹽巖力學(xué)特性影響的試驗研究[J];巖土力學(xué);2005年11期

6 高小平,楊春和,吳文,劉江;鹽巖蠕變特性溫度效應(yīng)的實驗研究[J];巖石力學(xué)與工程學(xué)報;2005年12期

7 鄭宏,葛修潤,李焯芬;脆塑性巖體的分析原理及其應(yīng)用[J];巖石力學(xué)與工程學(xué)報;1997年01期

8 賀玉龍,楊立中,楊明;巖體溫度場與應(yīng)力場耦合作用的一種量化方法[J];西南交通大學(xué)學(xué)報;2002年01期

9 孔祥言,李道倫,徐獻(xiàn)芝,盧德唐;熱-流-固耦合滲流的數(shù)學(xué)模型研究[J];水動力學(xué)研究與進(jìn)展A輯;2005年02期

10 劉亞晨,席道瑛;核廢料貯存裂隙巖體中THM耦合過程的有限元分析[J];水文地質(zhì)工程地質(zhì);2003年03期

相關(guān)會議論文 前1條

1 陳新;楊強(qiáng);周維垣;;基于二階損傷張量的節(jié)理巖體各向異性模型及其在井壁穩(wěn)定分析中的應(yīng)用[A];第八次全國巖石力學(xué)與工程學(xué)術(shù)大會論文集[C];2004年

相關(guān)博士學(xué)位論文 前2條

1 褚衛(wèi)江;低孔隙度巖石細(xì)觀本構(gòu)模型及損傷—滲流耦合研究[D];河海大學(xué);2007年

2 江濤;基于細(xì)觀力學(xué)的脆性巖石損傷—滲流耦合本構(gòu)模型研究[D];河海大學(xué);2006年

，

本文編號：2022268