裂隙岩石破坏过程的实验分析与扩展有限元研究
发布时间：2019-02-20 21:59
【摘要】：天然岩石是一类各向异性,非均质,不连续的材料,含有大尺度的节理、断面和薄弱层,宏观裂隙、孔洞和夹杂,以及微裂纹和孔隙结构。为了有效描述岩石渐进破坏过程中内部裂隙的萌生和扩展机理,正确识别岩石破坏的前兆预测信号,本文以红砂岩的室内实验为例,开展了完整岩石和具有不同裂隙角度下裂隙岩石的力学性质研究,分析了岩石破坏过程中能量转化规律和机理,并和数值模拟结果作对比。主要工作和成果包括:1)使用希尔伯特黄变换分析岩石破坏过程的声发射信号,以频谱分析为手段研究岩石力学性质;使用Biot理论分析孔隙结构对声发射信号的传播特性影响;探讨裂隙角度对能量演化与裂纹扩展规律的联系。2)提出基于试件表面全场位移的岩石失效过程能量演化分析方法;对比裂隙角度对能量释放过程的影响;对比体积变形与畸变形对裂纹扩展方式的影响;讨论夹杂对能量释放和裂纹扩展路径的影响。3)基于位移相关法提出一种适用于扩展有限元的应力强度因子计算格式;证明经典一阶格式不收敛;讨论高阶格式的参数选择方案;数值实验验证算法的正确性。4)使用Matlab实现岩石表面能量演化分析算法;使用Matlab实现并行化的声发射频谱分析系统;使用C++语言实现应力强度因子算法,并把上述算法和程序运用于本文的裂隙岩石破坏过程研究。
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU45
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU45
【相似文献】
相关期刊论文 前10条
1 蔡祖煌;;各向异性介质中地下水动力学基础——在裂隙岩石及倾斜层状岩石中如何精确经济迅速地求算涌水量?[J];地质论评;1959年07期
2 詹炳善;;裂隙岩石渗透空间结构特性概念模型述评[J];上海地质;1984年02期
3 刘东燕,朱可善,胡本雄;含裂隙岩石受压破坏的声发射特性研究[J];地下空间;1998年04期
4 王国艳;李树忱;杨磊;;单裂隙岩石损伤断裂过程的试验研究[J];辽宁工程技术大学学报(自然科学版);2009年04期
5 汪福p，
本文编号：2427327
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2427327.html
