【作者】 张颖；

【导师】 左宇军；

【作者基本信息】 贵州大学 ， 矿业工程， 2015， 硕士

【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。更多还原

【Abstract】 With the development of national economy and the improvement of science and technology, the exploitation and utilization of shallow mineral resources has been far from satisfying the needs of people. Hence, the coal mining have to transfer from ground to underground and from shallow to deep mining exploitation. However, there are more and more difficulties bud in the deep mining exploitation. It is harmful to the mine workers because of the complex deep mining environment such as high stress,high temperature, high osmotic pressure and strong disturbance. Rock as a non-uniform natural substances, include the joint, cracks and so on the complex geometrical properties. These weak medium structures can impact on the seepage flow stress coupling mechanism, finally, can affect the stability of surrounding rock.Therefore, the research of high stress, seepage water pressure and fracture structure on the stability of the tunnel in the deep discontinuous jointed rock is very necessary.In this paper, use the real coupling analysis system RFPA2D-flow to simulation analysis the process of deep mining in complex geological structure and engineering environment and so on. The specific research contents are following:(1)According to the current research of deep tunnel seepage in fractured zone is complete, not the fit engineering model, and the imperfect monitoring data. Extensive collection the literatures at home and abroad, collect and extract the useful information, determine the model parameters and construct the numerical model.(2)Simulation analysis the stability of tunnel under high stress in the deep mining,contains the fracture model of surrounding rock, the distribution of stress field, the process of crack development and the acoustic emission distribution in rock instabilityetc.(3)Numerical simulation the failure process under the seepage-stress coupled effect in the joint rock, study the process of propagation and coalescence in the discontinuity crack from the other sides. It is helpful to correct understanding the interaction mechanism of rock mass fracture and flow.(4)Numerical simulation the intermittent joint weak structural plane in the deep tunnel, analysis the safe stability under the seepage-stress-damage coupling effect, the results are very important significance to evaluate the safety and stability in the deep tunnel under complex environment.(5)Analysis of the common security measures of seepage flow fractured zone in deep tunnel.All in all, in this paper, some conclusions and achievements has been established through the simulation model, has certain value of theory and application to the research of stability in the intermittent joint rock mass and seepage-stress-flow coupling mechanism, to provide the reference for safety protection method in deep tunnel seepage fractured zone.更多还原