本文選題：鹽巖　切入點(diǎn)：彈性應(yīng)變能　出處：《重慶大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：鹽巖不僅是一種重要的礦產(chǎn)資源，而且作為能源儲存、有毒有害廢棄物以及CO2地質(zhì)處置的理想介質(zhì)受到了各國的廣泛重視，針對鹽巖礦床開采與腔體的后續(xù)利用等問題，開展鹽巖溶腔的穩(wěn)定性研究具有重要的理論和工程應(yīng)用價(jià)值�；诖�，結(jié)合國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973）（2009CB724606），在已有研究成果的基礎(chǔ)上，從鹽巖溶腔穩(wěn)定性評價(jià)角度出發(fā)，以鹽巖屈服破壞條件研究為主線，，采用試驗(yàn)研究、理論分析與數(shù)值仿真等綜合手段，基于能量轉(zhuǎn)化的基本原理，對鹽巖屈服準(zhǔn)則及其工程應(yīng)用等進(jìn)行了較為系統(tǒng)深入的研究。本文主要研究工作和成果如下： ①通過單軸壓縮、三軸壓縮、巴西劈裂等試驗(yàn)，研究了巖鹽、無水芒硝、泥巖的強(qiáng)度與變形特征，并獲得了抗壓強(qiáng)度、抗拉強(qiáng)度、粘聚力、摩擦角、彈性模量、泊松比等力學(xué)參數(shù)；通過分級加載蠕變試驗(yàn)獲得了圍壓和偏應(yīng)力對穩(wěn)態(tài)蠕變率的影響，建立了線性穩(wěn)態(tài)蠕變率本構(gòu)關(guān)系，并探討了線性和經(jīng)典的Norton-Power蠕變模型參數(shù)的變異對等速蠕變率的影響。 ②以彈性應(yīng)變能為基礎(chǔ)，通過定義能量分散系數(shù)建立了基于彈性應(yīng)變能整體破壞推廣準(zhǔn)則，結(jié)果表明該準(zhǔn)則所得理論值與三軸壓縮的試驗(yàn)值較為吻合；分析表明，單軸抗壓強(qiáng)度對該準(zhǔn)則的理論值影響比較明顯，而泊松比對該準(zhǔn)則的影響相對較小。 ③為使基于彈性應(yīng)變能的屈服與破壞準(zhǔn)則較好的適用于鹽巖，建立了基于彈性應(yīng)變能鹽巖的廣義屈服與破壞準(zhǔn)則，泊松比等于0.5時(shí)該準(zhǔn)則將蛻化為D-P準(zhǔn)則。分析表明粘聚力、泊松比對該準(zhǔn)則的影響基本是線性的，而摩擦角對該準(zhǔn)則的影響是非線性的；分別采用M-C準(zhǔn)則與廣義屈服與破壞準(zhǔn)則對巖石的強(qiáng)度進(jìn)行了計(jì)算，結(jié)果表明鹽巖廣義屈服與破壞準(zhǔn)則的計(jì)算結(jié)果與試驗(yàn)值較為接近。 ④基于理想彈塑性模型，以鹽巖廣義屈服與破壞準(zhǔn)則為剪切屈服函數(shù)，并考慮拉伸破壞，建立了可應(yīng)用于鹽巖的本構(gòu)模型。通過C++程序，對該本構(gòu)模型進(jìn)行了二次開發(fā)，并嵌入FLAC3D軟件用于數(shù)值計(jì)算。通過試驗(yàn)?zāi)M分析驗(yàn)證了二次開發(fā)本構(gòu)模型程序的正確性和合理性。 ⑤利用鹽巖理想彈塑性本構(gòu)模型二次開發(fā)的計(jì)算程序，對鹽巖溶腔的靜力穩(wěn)定性與長期穩(wěn)定性進(jìn)行了數(shù)值分析。重點(diǎn)研究了溶腔塑性區(qū)、溶腔腔體位移、溶腔體積收斂及安全礦柱等隨儲氣內(nèi)壓與蠕變時(shí)間的變化規(guī)律，確定了溶腔的最小內(nèi)壓、中淡化段厚度以及礦柱寬度。 ⑥鹽巖、泥巖力學(xué)參數(shù)的變異對鹽巖溶腔穩(wěn)定性影響的研究表明：鹽巖粘聚力、摩擦角對雙溶腔塑性區(qū)擴(kuò)展影響不明顯；而泥巖摩擦角對雙溶腔塑性區(qū)擴(kuò)展影響較為明顯。
[Abstract]:Salt rock is not only an important mineral resource, but also a kind of energy storage, toxic and harmful waste and ideal medium for CO2 geological disposal. The research on the stability of salt karst cavities has important theoretical and engineering application value. Based on this, combined with the national key basic research and development plan, 2009CB724606, based on the existing research results, from the point of view of the evaluation of the stability of salt karst cavities, Based on the basic principle of energy conversion, this paper takes the study of yield failure condition of salt rock as the main line, adopts comprehensive means such as experimental study, theoretical analysis and numerical simulation, etc. The yield criterion of salt rock and its engineering application are studied systematically and deeply. The main work and results of this paper are as follows:. 1 through uniaxial compression, triaxial compression and Brazilian splitting tests, the strength and deformation characteristics of rock salt, anhydrous mirabilite and mudstone are studied, and the compressive strength, tensile strength, cohesion, friction angle and elastic modulus are obtained. The influence of confining pressure and deflection stress on steady state creep rate is obtained by step loading creep test, and the constitutive relation of linear steady state creep rate is established. The influence of the variation of the parameters of the linear and classical Norton-Power creep model on the constant velocity creep rate is also discussed. 2 on the basis of elastic strain energy, by defining the energy dispersion coefficient, the generalized criterion of global failure based on elastic strain energy is established. The results show that the theoretical value obtained by the criterion is in good agreement with the experimental value of triaxial compression, and the analysis shows that, The uniaxial compressive strength has obvious influence on the theoretical value of the criterion, but Poisson's ratio has little effect on the criterion. In order to make the yield and failure criterion based on elastic strain energy more suitable for salt rock, a generalized yield and failure criterion based on elastic strain energy is established. When Poisson's ratio is equal to 0.5, the criterion will degenerate into D-P criterion. The influence of Poisson's ratio on the criterion is linear, and the influence of friction angle on the criterion is nonlinear. The strength of rock is calculated by M-C criterion and generalized yield and failure criterion, respectively. The results show that the calculated results of the generalized yield and failure criteria of salt rock are close to the experimental values. Based on the ideal elastic-plastic model, taking the generalized yield and failure criterion of salt rock as the shear yield function, and considering the tensile failure, a constitutive model of salt rock is established. The constitutive model is redeveloped by C program. The FLAC3D software is embedded in the numerical calculation, and the correctness and rationality of the secondary development constitutive model program are verified by the experimental simulation and analysis. 5. The static stability and long-term stability of salt karst cavity are numerically analyzed by using the calculation program of the ideal elastoplastic constitutive model of salt rock. The plastic zone of the cavity and the displacement of the cavity are studied emphatically. The minimum internal pressure, the thickness of the middle desalination section and the width of the ore column are determined by the variation of the volume convergence of the dissolved cavity and the safety pillar with the gas storage internal pressure and creep time. 6 the influence of variation of mechanical parameters of salt rock and mudstone on the stability of salt karst cavity shows that the cohesive force and friction angle of salt rock have no obvious influence on the expansion of plastic zone of double solution cavity, while the angle of friction of mudstone has more obvious effect on the expansion of plastic zone of double solution cavity.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU45

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