【摘要】：天然巖石是一類各向異性,非均質(zhì),不連續(xù)的材料,含有大尺度的節(jié)理、斷面和薄弱層,宏觀裂隙、孔洞和夾雜,以及微裂紋和孔隙結(jié)構(gòu)。為了有效描述巖石漸進(jìn)破壞過程中內(nèi)部裂隙的萌生和擴(kuò)展機(jī)理,正確識(shí)別巖石破壞的前兆預(yù)測信號(hào),本文以紅砂巖的室內(nèi)實(shí)驗(yàn)為例,開展了完整巖石和具有不同裂隙角度下裂隙巖石的力學(xué)性質(zhì)研究,分析了巖石破壞過程中能量轉(zhuǎn)化規(guī)律和機(jī)理,并和數(shù)值模擬結(jié)果作對比。主要工作和成果包括:1)使用希爾伯特黃變換分析巖石破壞過程的聲發(fā)射信號(hào),以頻譜分析為手段研究巖石力學(xué)性質(zhì);使用Biot理論分析孔隙結(jié)構(gòu)對聲發(fā)射信號(hào)的傳播特性影響;探討裂隙角度對能量演化與裂紋擴(kuò)展規(guī)律的聯(lián)系。2)提出基于試件表面全場位移的巖石失效過程能量演化分析方法;對比裂隙角度對能量釋放過程的影響;對比體積變形與畸變形對裂紋擴(kuò)展方式的影響;討論夾雜對能量釋放和裂紋擴(kuò)展路徑的影響。3)基于位移相關(guān)法提出一種適用于擴(kuò)展有限元的應(yīng)力強(qiáng)度因子計(jì)算格式;證明經(jīng)典一階格式不收斂;討論高階格式的參數(shù)選擇方案;數(shù)值實(shí)驗(yàn)驗(yàn)證算法的正確性。4)使用Matlab實(shí)現(xiàn)巖石表面能量演化分析算法;使用Matlab實(shí)現(xiàn)并行化的聲發(fā)射頻譜分析系統(tǒng);使用C++語言實(shí)現(xiàn)應(yīng)力強(qiáng)度因子算法,并把上述算法和程序運(yùn)用于本文的裂隙巖石破壞過程研究。
[Abstract]:Natural rocks are a class of anisotropic, heterogeneous, discontinuous materials containing large scale joints, sections and weak layers, macroscopic fractures, pores and inclusions, as well as microcracks and pore structures. In order to effectively describe the initiation and propagation mechanism of internal cracks during progressive rock failure and correctly identify the precursor prediction signals of rock failure, this paper takes the laboratory experiment of red sandstone as an example. The mechanical properties of intact rock and fractured rock with different fracture angles are studied. The law and mechanism of energy transformation during rock failure are analyzed and compared with the results of numerical simulation. The main work and achievements are as follows: 1) the acoustic emission signals of rock failure process are analyzed by Hilbert-Huang transform, and the mechanical properties of rock are studied by spectrum analysis; Biot theory is used to analyze the influence of pore structure on the propagation characteristics of acoustic emission signals, and the relationship between fracture angle and energy evolution and crack propagation is discussed. 2) an energy evolution analysis method for rock failure process based on full-field displacement of specimen surface is proposed. The effects of fracture angle on energy release, volume deformation and distortion on crack propagation are compared. The influence of inclusions on energy release and crack propagation path is discussed. 3) based on the displacement correlation method, a stress intensity factor scheme for extended finite element is proposed, and it is proved that the classical first-order scheme does not converge. The parameter selection scheme of high order scheme is discussed, the correctness of the algorithm is verified by numerical experiments. 4) the energy evolution analysis algorithm of rock surface is implemented by Matlab, and the parallel acoustic emission spectrum analysis system is implemented by Matlab. The algorithm of stress intensity factor is realized by using C language, and the above algorithm and program are applied to the study of fracture rock failure process in this paper.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU45

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本文編號(hào)：2427327