本文選題：花崗巖 + 礦物��； 參考：《工程地質(zhì)學(xué)報(bào)》2017年06期

【摘要】：巖石工程性質(zhì)取決于巖石中不同礦物的微觀特征,本次研究將從微觀角度計(jì)算北山花崗巖中主要礦物(石英、黑云母和鈉長石)的物理性質(zhì)和力學(xué)性質(zhì)。礦物的微觀物理性質(zhì)使用體積和密度來表征,礦物的微觀力學(xué)性質(zhì)使用楊氏模量和泊松比來表征;礦物的初始晶體結(jié)構(gòu)、初始晶胞參數(shù)、單晶胞模型和超晶胞模型使用公開數(shù)據(jù)庫獲得;礦物晶胞的穩(wěn)定構(gòu)象由幾何優(yōu)化方法來實(shí)現(xiàn);使用分子力學(xué)模擬,得到了不同礦物穩(wěn)定構(gòu)象的微觀物理性質(zhì)參數(shù)和微觀力學(xué)性質(zhì)參數(shù);使用分子動(dòng)力學(xué)模擬,分析了溫度和壓強(qiáng)對(duì)這些微觀物理力學(xué)性質(zhì)參數(shù)的影響。結(jié)果表明,花崗巖的3種主要礦物中,晶胞體積大小順序是鈉長石、黑云母、石英,晶胞密度大小順序是黑云母、石英、鈉長石;石英的楊氏模量為161.70~168.78GPa、泊松比為0.25,黑云母的楊氏模量為164.85~579.93GPa、泊松比為0.16~0.31,鈉長石的楊氏模量為110.72~112.49GPa、泊松比為0.27;壓強(qiáng)為0.0001GPa、溫度從300K變化到500K時(shí),石英晶胞體積增大0.17%、密度減小0.15%、楊氏模量和泊松比沒有明顯變化,黑云母晶胞體積增大0.24%、密度減小0.26%、楊氏模量增大140.55%、泊松比減小26.92%,鈉長石晶胞體積減小3.76%、密度增大3.91%、楊氏模量增大319.71%、泊松比減小7.41%;溫度為298K、壓強(qiáng)從0.010GPa變化到0.020GPa時(shí),石英晶胞體積、密度、楊氏模量和泊松比沒有明顯變化,黑云母晶胞體積和密度沒有明顯變化、楊氏模量增大53.79%、泊松比減小23.81%,鈉長石晶胞體積和密度沒有明顯變化、楊氏模量減小36.24%、泊松比增大29.41%。研究結(jié)果對(duì)分析巖石宏觀物理力學(xué)特性的微觀機(jī)制具有一定的參考價(jià)值。
[Abstract]:The engineering properties of rocks depend on the microscopic characteristics of different minerals in rocks. In this study, the physical and mechanical properties of the main minerals (quartz, biotite and albite) in the Beishan granite will be calculated from the microscopic point of view. The microphysical properties of minerals are characterized by volume and density, the micromechanical properties of minerals are characterized by Young's modulus and Poisson's ratio, the initial crystal structure, initial unit cell parameters, The unit cell model and supercell model are obtained by using open database; the stable conformation of mineral unit cell is realized by geometric optimization method; and the molecular mechanics simulation is used. The parameters of microphysical properties and micromechanical properties of different mineral stable conformations are obtained, and the effects of temperature and pressure on these parameters are analyzed by molecular dynamics simulation. The results show that among the three main minerals of granite, the order of unit cell volume is albite, biotite, quartz, and the order of cell density is biotite, quartz and albite. The Young's modulus, Poisson's ratio, biotite's Young's modulus and Poisson's ratio of quartz and biotite are 161.70, 168.78, 0.25, 164.85 and 0.16, 0.31, 110.72 and 0.27, respectively, and the pressure is 0.0001GPa. the temperature changes from 300K to 500K. The volume of quartz cell increased by 0.17 and the density decreased by 0.15.The Young's modulus and Poisson's ratio did not change obviously. The volume of the crystal cell of biotite increases by 0.24, the density decreases by 0.26, the Young's modulus increases by 140.55, the Poisson's ratio decreases by 26.92, the volume of the albite cell decreases by 3.76, the density increases by 3.91, the Young's modulus increases by 319.71, the Poisson's ratio decreases by 7.41, the temperature is 298K, and the volume of quartz cell changes from 0.010GPa to 0.020GPa. The density, Young's modulus and Poisson's ratio did not change obviously, but the volume and density of biotite cell did not change obviously, the Young's modulus increased 53.79, Poisson's ratio decreased 23.81, and the volume and density of albite cell did not change obviously. The Young's modulus decreases 36.24 and the Poisson's ratio increases 29.41. The results have some reference value for analyzing the microscopic mechanism of macroscopic physical and mechanical properties of rock.
【作者單位】： 上海大學(xué)土木工程系;
【基金】：國家自然科學(xué)基金項(xiàng)目(41472254)資助
【分類號(hào)】：TU45

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1 李燕芳;高溫后花崗巖巖爆的聲發(fā)射特征研究[D];廣西大學(xué);2017年

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本文編號(hào)：1867748