本文選題：風(fēng)化花崗巖 + 顆粒離散元�。� 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：花崗巖廣泛分布于華南地區(qū)，，受亞熱帶濕熱多雨氣候影響，巖石本身發(fā)生不同程度的風(fēng)化。本文選取廣州從化地區(qū)不同風(fēng)化程度的花崗巖，基于細觀力學(xué)的研究方法，揭示其變形機制以及破壞機理。論文研究不同風(fēng)化程度花崗巖材料從細觀到宏觀層次的力學(xué)行為，并以試驗與數(shù)值仿真相結(jié)合，研究其變形、損傷和非線性斷裂的宏觀規(guī)律，建立巖石材料破損行為的細觀離散元模型；建立從多相細觀到宏觀聯(lián)系的多尺度研究方法，為研究巖石類非均質(zhì)準(zhǔn)脆性材料破裂機制奠定基礎(chǔ)。論文主要研究工作和創(chuàng)新成果有： （1）對風(fēng)化花崗巖的破損行為進行了巴西劈裂及單軸壓縮試驗研究，研究了不同風(fēng)化程度花崗巖的強度及變形破壞規(guī)律。 （2）基于數(shù)字圖像處理技術(shù)，結(jié)合電鏡掃描試驗鑒定礦物成分，建立反映巖石細觀真實結(jié)構(gòu)的離散元模型�；谠撃Ｐ蛯ζ脚_巴西試驗中細觀結(jié)構(gòu)、平臺中心角及端部摩擦的影響進行了仿真分析，初步驗證了模型的可靠性。 （3）基于花崗巖不同風(fēng)化程度試件的斷面圖片，生成細觀結(jié)構(gòu)與之對應(yīng)的數(shù)值仿真試件，對風(fēng)化花崗巖的強度及破損行為進行了數(shù)值仿真研究。 （4）引入空間相關(guān)隨機場表征巖石細觀結(jié)構(gòu)的非均質(zhì)性，實現(xiàn)空間相關(guān)隨機場的數(shù)值生成，并將成果導(dǎo)入顆粒離散元程序PFC中生成相應(yīng)的細觀離散元模型。 （5）基于空間相關(guān)隨機場的細觀離散元模型，進行了風(fēng)化花崗巖的巴西劈裂及單軸壓縮數(shù)值仿真試驗，并將仿真結(jié)果與物理試驗結(jié)果進行了對比分析，結(jié)果證明該模型是可靠的。
[Abstract]:The granite is widely distributed in South China and weathered in different degrees under the influence of subtropical humid and rainy climate. In this paper, granites with different weathering degrees in Conghua area of Guangzhou are selected to reveal their deformation mechanism and failure mechanism based on the research method of meso-mechanics. In this paper, the mechanical behavior of granite materials with different weathering degrees from meso to macroscopic level is studied, and the macroscopic laws of deformation, damage and nonlinear fracture are studied by combining experiments with numerical simulation. A mesoscale discrete element model for the failure behavior of rock materials and a multi-scale method for studying the relationship between multiphase meso and macroscopical relations were established, which laid a foundation for studying the fracture mechanism of rock heterogeneous quasi brittle materials. The main research work and innovative achievements are as follows: 1) the fracture behavior of weathered granite was studied by Brazilian splitting and uniaxial compression tests, and the strength and deformation failure of granite with different weathering degrees were studied. 2) based on digital image processing technology and SEM scanning test, a discrete element model is established to reflect the real structure of rock. Based on this model, the effects of the mesoscopic structure, the center angle and the end friction of the platform are simulated and analyzed, and the reliability of the model is preliminarily verified. 3) based on the cross-section pictures of granite samples with different weathering degrees, the corresponding numerical simulation specimens with meso-structures are generated, and the strength and damage behavior of weathered granite are studied numerically. 4) the spatial correlation random field is introduced to characterize the heterogeneity of rock meso-structure, and the numerical generation of spatial correlation random field is realized, and the results are introduced into the particle discrete element program PFC to generate the corresponding meso-discrete element model. 5) based on the mesoscopic discrete element model of spatial correlation random field, the Brazilian splitting and uniaxial compression numerical simulation tests of weathered granite are carried out, and the results of simulation and physical test are compared and analyzed. The results show that the model is reliable.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU45

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