复杂节理岩体离散块体建模及其工程应用

发布时间：2018-05-31 13:35

  本文选题：结构面网络模拟 + 节理岩体模型　； 参考：《长沙理工大学》2014年硕士论文

【摘要】：土木工程建设中,经常遇到工程岩体的稳定性问题。由于岩体的复杂结构特性,如何正确的模拟复杂节理岩质边坡并分析其稳定性一直以来是岩石力学中的一个难题。而块体模型在结构性岩体的分析方面具有连续介质分析方法无法替代的优势和特点,现已成为分析复杂节理岩体稳定性的主要方法。块体模型分析方法中,模型的几何建立是很关键的,其直接反应了结构面的分布规律。因为结构面控制了岩体力学性能,所建立的块体模型也控制了分析结果,其对分析结果的影响远远大于连续体分析的模型如有限元模型。然而迄今为止,以离散单元法(Discrete Element Method, DEM)等分析方法为代表的块体模型分析方法,仍无法在岩体工程分析中表现出与有限元等连续介质分析方法同样的受到重视并发挥其作用；同时其发展和应用仍然受到一些关键技术的制约和影响,其难点之一就是如何快速的建立与岩体结构面分布规律相符合的块体分析模型。本文利用结构面网络模拟技术的优势,通过Matlab编程对模拟的岩体节理数据做了预处理,自动生成结构面网络模拟图和离散元软件UDEC的建模命令文件。在UDEC软件中调入建模命令文件,就可以快速得到与节理分布模型对应的块体分析模型。结合边坡实例,将生成的块体分析模型进行边坡稳定性分析,通过与UDEC原有的统计节理生成器生成的块体分析模型相比较,发现本文建立的块体分析模型,其块体划分符合岩体结构面的分布规律,而且所计算的安全系数离散程度较小。实例说明了本文的建模方案行之有效,为复杂节理岩体块体分析模型建模提供了一有效途径。
[Abstract]:In the construction of civil engineering, the stability of the rock mass is often encountered. Because of the complex structural characteristics of the rock mass, it is always a difficult problem to correctly simulate the complex jointed rock slope and analyze its stability. The block model can not replace the continuous medium analysis method in the analysis of structural rock mass. The advantages and characteristics of the generation have now become the main method to analyze the stability of complex jointed rock mass. In the method of block model analysis, the geometric establishment of the model is critical, which directly reflects the distribution of the structural plane. Because the structural plane controls the mechanical properties of the rock mass, the established block model also controls the analysis results. The effect of the fruit is far greater than the model of the continuum analysis, such as the finite element model. However, so far, the block model analysis method, represented by the discrete element method (Discrete Element Method, DEM) and so on, is still unable to show the same importance as the finite element method of continuous medium analysis in the rock mass engineering analysis. At the same time, its development and application are still restricted and influenced by some key technologies. One of the difficulties is how to quickly establish a block analysis model which is consistent with the distribution law of rock mass. In this paper, using the advantages of the network simulation technology of structural surface, the simulated rock jointing data is pre placed through Matlab programming. The structure surface network simulation graph and the modeling command file of the discrete element software UDEC are automatically generated. The block analysis model corresponding to the joint distribution model can be quickly obtained by adjusting the modeling command files in the UDEC software. Compared with the block analysis model generated by the joint generator, it is found that the block analysis model established in this paper conforms to the distribution law of the structural plane of rock mass, and the calculated safety coefficient is small. The example shows that the modeling scheme is effective and provides the model modeling for complex jointed rock mass block. An effective way.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU45
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本文编号：1959903