本文選題：泥巖　切入點：損傷演化　出處：《武漢大學》2014年博士論文

【摘要】：富含粘土礦物的泥巖是介于土和堅硬巖石之間的一種過渡性材料,由于其低滲透性、良好的蠕變性和遇水損傷自修復、高吸附性、較好的地球化學封閉性等特征,被認為是儲存核廢料的三種備選場地之一。在歐洲,法國、瑞士、比利時等國家都針對泥巖的力學特性和滲透特性開展了系統(tǒng)的研究,并相繼建成地下試驗平臺,進行現(xiàn)場的多場耦合試驗。本文將圍繞泥巖的彈塑性損傷本構(gòu)模型、滲流-應力-損傷耦合模型及滲透性自愈合模型等方面開展研究,通過系統(tǒng)的試驗研究、理論分析和數(shù)值仿真,揭示圍巖的損傷演化機理、圍巖EDZ的滲透演化機理及滲透性自愈合機理,建立能夠描述EDZ開挖擾動效應及自愈合效應的數(shù)學模型,為泥巖核廢料處置庫圍巖穩(wěn)定控制和安全評價提供依據(jù)。本論文的主要研究內(nèi)容如下： (1)對典型泥巖處置庫圍巖的破壞特征、力學行為特征進行系統(tǒng)地分析,揭示泥巖開挖損傷機制,提出處置庫泥巖的破壞準則；借助最小功耗原理,推導能夠描述泥巖宏細觀破壞特征及力學行為的損傷演化方程,建立彈塑性損傷本構(gòu)模型。借助ABAQUS軟件編寫相應的數(shù)值仿真程序,驗證程序的適用性和正確性,并分析泥巖處置庫圍巖EDZ受開挖影響的演化規(guī)律。 (2)對典型泥巖處置庫圍巖滲透特征及滲透演化規(guī)律進行系統(tǒng)地分析,揭示泥巖滲流動態(tài)演化機理；根據(jù)泥巖應力-應變過程中的滲透性演化曲線,將泥巖變形破壞過程中的演化曲線分為三個階段：滲透性降低、滲透性增長及滲透性穩(wěn)定三個階段；針對擴容點附近滲透性的突變特征,引入逾滲理論,分析泥巖的滲透性逾滲特征,推導能夠描述泥巖宏細觀水力學行為的的滲透性演化方程,建立泥巖滲流-應力-損傷耦合模型,將滲流-應力-損傷耦合本構(gòu)模型嵌入到ABAQUS計算軟件中實現(xiàn)了數(shù)值仿真計算,利用該模型對某巷道的施工過程進行數(shù)值模擬,研究孔隙壓力、損傷、滲透系數(shù)等的時空演化規(guī)律。 (3)系統(tǒng)分析典型處置庫泥巖自愈合的室內(nèi)及現(xiàn)場試驗,分析影響自愈合過程的因素及各因素對滲透性的影響規(guī)律,得出本文研究所需考慮的泥巖自愈合影響因素,揭示泥巖的自愈合機理,建立滲透性自愈合模型；以ABAQUS為平臺進行二次開發(fā),編寫相應的數(shù)值計算程序,對泥巖巷道的施工過程進行數(shù)值模擬,分析自愈合對孔隙壓力、損傷、滲透系數(shù)等演化規(guī)律的影響。 (4)以比利時HADES地下實驗室Connecting Gallery為例,結(jié)合泥巖力學特性、彈塑性本構(gòu)模型及滲透性演化模型等研究成果,對Connecting Gallery圍巖的應力、變形、孔隙水壓力變化、損傷演化規(guī)律及滲透性演化規(guī)律等進行模擬分析,揭示泥巖核廢料處置庫的變形破壞機理以及地下水的運移規(guī)律,為圍巖穩(wěn)定控制和安全評價提供依據(jù)。
[Abstract]:It is considered to be one of three alternative sites for nuclear waste storage.In Europe, France, Switzerland, Belgium and other countries, the mechanical properties and permeability characteristics of mudstone have been systematically studied, and underground test platforms have been built to carry out field multi-field coupling tests.In this paper, the elastoplastic damage constitutive model, seepage stress-damage coupling model and permeability self-healing model of mudstone are studied. Through systematic experimental research, theoretical analysis and numerical simulation,The damage evolution mechanism of surrounding rock, the permeability evolution mechanism and permeability self-healing mechanism of surrounding rock EDZ are revealed, and a mathematical model which can describe the disturbance effect and self-healing effect of EDZ excavation is established.It provides the basis for the stability control and safety evaluation of the surrounding rock in the mudstone nuclear waste disposal depot.The main contents of this thesis are as follows:1) systematically analyzing the failure characteristics and mechanical behavior characteristics of the surrounding rock of typical mudstone disposal reservoir, revealing the damage mechanism of mudstone excavation, putting forward the failure criterion of disposal mudstone, and using the principle of minimum power consumption,The damage evolution equations which can describe the macroscopic failure characteristics and mechanical behavior of mudstone are derived and the elastoplastic damage constitutive model is established.With the help of ABAQUS software, the corresponding numerical simulation program is compiled to verify the applicability and correctness of the program, and to analyze the evolution law of EDZ affected by excavation in the surrounding rock of mudstone disposal reservoir.(2) the seepage characteristics and seepage evolution law of typical mudstone disposal reservoir are systematically analyzed to reveal the dynamic evolution mechanism of mudstone seepage, according to the permeability evolution curve of mudstone stress-strain process,The evolution curve of mudstone deformation and failure is divided into three stages: permeability reduction, permeability growth and permeability stability.The permeability percolation characteristic of mudstone is analyzed, the permeability evolution equation which can describe the macroscopical hydraulic behavior of mudstone is deduced, and the coupled model of seepage, stress-damage is established.The coupled constitutive model of seepage stress and damage is embedded into ABAQUS software to realize numerical simulation. The model is used to simulate the construction process of a roadway to study pore pressure and damage.The temporal and spatial evolution of permeability coefficient and so on.3) systematically analyzing the laboratory and field tests of mudstone self-healing in typical disposal reservoir, analyzing the factors affecting self-healing process and the influence law of each factor on permeability, and obtaining the influencing factors of mudstone self-healing that need to be considered in this paper.The self-healing mechanism of mudstone is revealed, the permeability self-healing model is established, the secondary development is carried out on the platform of ABAQUS, the corresponding numerical calculation program is compiled, the construction process of mudstone roadway is numerically simulated, and the pore pressure and damage caused by self-healing are analyzed.The influence of the evolution law such as permeability coefficient.Taking Connecting Gallery of HADES underground laboratory in Belgium as an example, combining with the mechanical properties of mudstone, elastoplastic constitutive model and permeability evolution model, the changes of stress, deformation and pore water pressure of Connecting Gallery surrounding rock are studied.The damage evolution law and permeability evolution law are simulated and analyzed to reveal the mechanism of deformation and failure of mudstone nuclear waste disposal depot and the law of groundwater migration, which provides the basis for the stability control and safety evaluation of surrounding rock.
【學位授予單位】：武漢大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU45;TV139.1

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