基于分布式光纤采场底板变形破坏特征测试研究

发布时间：2018-05-20 18:32

本文选题：采场底板 + 采动变形　；参考：《安徽理工大学》2017年硕士论文

【摘要】：煤炭是我国的重要的基础能源和化工原料。随着煤炭资源开采深度和开采范围将不断向深部延伸和扩大,其开采条件也随之改变,矿井水害防治将面临更多的技术难题。研究底板水威胁煤层安全开采的问题,对充分、有效的开发煤炭资源、实现老矿挖潜、新老矿井合理接替以及可持续发展我国的煤炭工业具有重要的现实意义。论文通过开展底板变形破坏理论、技术的调研和文献检索,了解与掌握底板变形破坏研究现状、重要学术成果和发展趋势;利用分布式光纤线性测量优点,开展分布式光纤室内岩石压裂试验,探究分布式光纤在岩石破裂演化测试的可行性和可靠性;基于室内试验基础,结合工程现场地质条件构建煤层底板钻孔光纤传感监测系统,根据工作面不同回采进度条件下底板岩层应变场参数的响应,测试与分析煤层底板破坏与开采过程在时间和空间变化的关系。研究获得分布式光纤测试技术岩体破裂变形测试中对比MTS测试系统结果误差为13.2%。同时,分布式光纤测试技术现场原位实测获得采场底板在采动过程的形变特征,动态获得底板破坏应力场状态,获得采场底板破坏区深度范围为0-7.2m,扰动影响深度范围7.2-26.3m,超前应力影响范围36m。研究分布式光纤对于岩体破裂演化测试的可行性和有效性,为岩体宏观损伤演化和现场工程岩体的宏观断裂失稳提供借鉴和思路。工程应用中实现对底板岩层变形破坏的精细化判别与定量解释。新技术的应用有利于全面、充分认识采场底板变形破坏及岩层位移特征,对矿井底板水害防治、采场空间稳定性有着重要实践意义和指导意义。但技术应用过程中在施工、耦合、解释等方面依然存在不足,需要进一步深入研究。
[Abstract]:Coal is an important basic energy and chemical raw material in China. With the coal mining depth and mining scope will continue to extend and expand to the deep, the mining conditions will also change, the mine water disaster prevention will face more technical problems. It is of great practical significance to study the problem that floor water threatens the safe mining of coal seams, which is of great practical significance for the full and effective exploitation of coal resources, the realization of tapping potential of old mines, the reasonable replacement of new and old mines and the sustainable development of coal industry in our country. Through developing the theory of bottom plate deformation and failure, technical investigation and literature retrieval, the paper understands and grasps the present situation, important academic achievements and development trend of bottom plate deformation and failure, utilizes the advantages of distributed optical fiber linear measurement, and makes use of the advantages of distributed optical fiber linear measurement. In order to explore the feasibility and reliability of distributed optical fiber in rock fracture evolution test, a fiber optic sensing monitoring system for coal seam floor drilling is constructed based on laboratory test and engineering geological conditions. According to the response of the strain field parameters of the floor strata under different mining schedule conditions, the relationship between the failure of coal seam floor and the change of time and space in the mining process is tested and analyzed. In this paper, the error of the MTS test system in the distributed optical fiber testing technique for rock mass fracture deformation measurement is 13. 2%. At the same time, the in-situ measurement of distributed optical fiber testing technology obtained the deformation characteristics of the stope floor in the mining process, and the dynamic state of the failure stress field of the floor was obtained. The depth range of failure zone of stope floor is 0-7.2 m, the influence depth range of disturbance is 7.2-26.3 m, and the influence range of leading stress is 36 m. The feasibility and effectiveness of distributed optical fiber for rock mass fracture evolution testing are studied, which provides a reference for macroscopic damage evolution of rock mass and macroscopic fracture instability of field engineering rock mass. In engineering application, the detailed discrimination and quantitative interpretation of deformation and failure of floor rock are realized. The application of the new technology is beneficial to the comprehensive understanding of the deformation and failure of the stope floor and the characteristics of the rock displacement. It is of great practical significance and guiding significance for the prevention and control of the mine floor water hazard and the stope spatial stability. However, there are still shortcomings in construction, coupling and interpretation in the process of technology application, which need further study.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD745.2

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