深部断续节理岩体中渗流对巷道稳定性影响的研究

发布时间：2018-02-21 03:21

本文关键词： 深部开采断续节理渗流-应力-损伤耦合巷道稳定性数值模拟　出处：《贵州大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着国民经济的提高和科学技术的发展,对浅层矿产资源开发利用不能满足人们的需求,使矿山地上开采逐渐转向地下,从浅部开采到深部矿山开采的转变。在深部开采过程中,遇到的困难程度也逐渐增加。矿井深部开采工程环境中存在的“三高”(地应力、温度、渗流压力)和“一扰动”(开采扰动)影响,都给深部开采技术和保障人员安全带来了很大的困难。而岩石是一种非均匀的天然物质,其内部存在十分复杂的几何特性,如节理、裂隙等。而这些弱介质构造的存在又对渗流应力耦合机制产生影响,最终影响巷道围岩的稳定。因此,研究处在深部渗流裂隙带内的巷道在多因素影响下的稳定性情况是非常必要的。本文利用岩石真实破裂过程分析软件渗流版本RFPA2D-FLOW,对地质构造和工程环境复杂的深部矿井开采问题进行工程仿真分析,研究的主要内容包含下列几个方面:(1)针对目前深部渗流裂隙带内的巷道稳定性研究尚不完备,工程实例模型尚不贴合,监测数据尚不完善的现状,广泛了解国内外相关领域研究现状,整理并提取有用信息,确定模型参数,构建数值模型。(2)深部开采过程高地应力对巷道稳定性的影响的模拟分析,包括巷道围岩的破裂模式,应力场分布状态,裂隙萌生发展过程,围岩失稳的声发射时空分布等。(3)对渗流、应力联合加载情况下含节理岩体的破坏过程进行数值模拟分析,研究了岩体中断续节理的演化过程,从数值方面分析了裂纹损伤扩展机理,对更全面地认识了解渗流-应力-损伤机制有着重大的帮助。(4)对含有断续节理软弱结构面的深埋巷道模型进行数值模拟分析,分析其在渗流-应力-损伤耦合作用下的安全稳定性,研究结果对复杂环境下深埋巷道的安全稳定性评价具有十分重要的意义。(5)分析探讨了深埋巷道渗流裂隙带的常用安全防护措施。本文通过对各个模型的模拟分析研究,取得了一些具有建设性的结论及成果,对断续节理岩体中深埋巷道稳定性影响及渗流-应力-损伤耦合作用机制的研究具有一定的理论及应用价值,对深埋巷道渗流裂隙带的安全防护方法提供参考帮助。
[Abstract]:With the improvement of national economy and the development of science and technology, the exploitation and utilization of shallow mineral resources can not meet the needs of people. The transformation from shallow mining to deep mining. In the process of deep mining, the difficulty degree also increases gradually. The "three high" (ground stress, temperature) existing in deep mining engineering environment, The influence of percolation pressure) and "disturbance" (mining disturbance) has brought great difficulties to deep mining technology and ensuring the safety of personnel. Rock is a kind of non-uniform natural material, and its interior has very complex geometric characteristics, such as joints. The existence of these weak media structures has an impact on the seepage stress coupling mechanism, and ultimately affects the stability of the surrounding rock of the roadway. It is necessary to study the stability of roadway in deep seepage fracture zone under the influence of many factors. In this paper, RFPA2D-FLOW is used to analyze the true fracture process of rock, which is very complex to geological structure and engineering environment. The engineering simulation analysis of the mining problem in the Ministry of Coal Mine is carried out. The main contents of the study include the following aspects: (1) aiming at the present situation that the stability study of roadway in deep seepage fracture zone is not complete, the engineering example model is not suitable, and the monitoring data are not perfect, The present situation of research in related fields at home and abroad is widely understood, useful information is sorted out and useful information is extracted, model parameters are determined, numerical model. 2) the simulation analysis of the influence of high ground stress on roadway stability during deep mining process, including the failure mode of surrounding rock of roadway, is presented. Stress field distribution state, crack initiation and development process, acoustic emission space-time distribution of surrounding rock instability, etc.) numerical simulation analysis of the failure process of jointed rock mass under the condition of seepage and stress combined loading is carried out. The evolution process of discontinuous joints in rock mass is studied, and the mechanism of crack damage propagation is analyzed numerically. It is of great help to understand more fully the mechanism of seepage stress damage. (4) numerical simulation analysis of deep buried roadway model with discontinuous joint weak structural plane is carried out. Its safety and stability under the coupling of seepage, stress and damage are analyzed. The results are of great significance to evaluate the safety and stability of deep buried roadway under complex environment. (5) the common safety protection measures of deep buried roadway seepage fracture zone are analyzed and discussed. The simulation analysis of each model is carried out in this paper. Some constructive conclusions and achievements have been obtained, which have certain theoretical and practical value for the study of the influence of the stability of deep buried roadway and the mechanism of seepage stress damage coupling in intermittent jointed rock mass. It provides a reference for the safety protection method of seepage fracture zone in deep buried roadway.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD322.4

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