深井高应力大断面硐室围岩稳定性分析和支护机理研究

发布时间：2018-05-04 15:54

本文选题：深井 + 大断面硐室　；参考：《山东科技大学》2017年硕士论文

【摘要】：随着煤炭资源近几十年的开采,矿山的采掘活动正逐步的向深部发展转移。深井条件下的大断面硐室,具有高地应力埋藏深,断面积大的特点,深部大断面硐室的开挖与支护过程是一个应力重新分布的过程。进行该类硐室的支护设计要兼顾影响围岩稳定的各方面影响因素。本文是在结合于赵楼矿实际的地质资料和工程概况,对影响深井高应力条件下的大断面硐室围岩稳定性的自然因素和人为因素进行分析;对大断面硐室常见的支护方式进行了梳理总结。总结出围岩的围岩场和围岩应力场的变化规律从而确定出了锚注支护的最佳支护方案。最后对赵楼矿的中央泵房硐室分开挖和几种支护方案进行数值模拟。对于深井高应力大断面硐室围岩稳定性分析及支护机理研究采取的技术路线是通过查阅资料收集文献后,利用实验室试验实现工程的现场应用和监测,利用理论计算分析和数值模拟分析得出硐室围岩变形破坏规律、围岩加固方法。继而通过模拟验证加固方法的可行性。(1)对于深井大断面硐室围岩稳定的影响因素进行分析,将影响稳定性的因素归类为自然因素和人为因素。自然因素主要包括围岩岩性、地质构造和地应力、地温和水化损伤等;人为因素包括开挖和掘进施工、回采影响、施工质量、支护设计的不合理等。(2)利用地应力实测、实验室矿物组分分析等得出硐室围岩的矿区组分、岩石的基本力学参数、深井大断面硐室一定区域内的应力状况,利用诸多的试验手段为硐室支护方案的设计提供参数依据。(3)利用数值模拟软件FLAC3D对于中央泵房硐室在锚网喷、锚网索喷、锚注不同支护条件下的围岩位移变形、塑性区、锚杆受力等进行模拟分析对比得出:锚注支护可以作为深井高应力条件下大断面硐室的可靠支护方式。(4)针对于赵楼煤矿深部高应力条件下大断面硐室破坏的特点和实际工程地质状况提出二次支护方案,对中央泵房硐室、副井马头门、清理撒煤硐室提出具体的支护设计方案。(5)针对于该课题后续研究提出部分展望。因目前缺乏大量实验数据和工程实践的规律性总结,要提高对该条件围岩性质的认识,需做进一步探讨;高应力条件下围岩的工程特性发生的微观机理分析不够,裂隙发展规律、遇水岩性变化的微观演化过程尚需进一步分析;针对工程实际情况和现场条件调整使用不同注浆材料或者研究使用具有微膨胀性的注浆材料。
[Abstract]:With the mining of coal resources in recent decades, mining activities are gradually moving to the deep. The large section chamber under the condition of deep well has the characteristics of deep buried high ground stress and large fault area. The excavation and support process of deep large section chamber is a process of stress redistribution. The supporting design of this kind of chamber should take into account the factors affecting the stability of surrounding rock. Combined with the actual geological data and engineering survey of Zhaolou Mine, this paper analyzes the natural and human factors that affect the stability of surrounding rock of large section chamber under the condition of deep well and high stress. The common supporting methods of large section chamber are summarized. The law of variation of surrounding rock field and surrounding rock stress field is summarized and the best supporting scheme of bolt-grouting support is determined. Finally, the excavation and several supporting schemes of the central pump chamber in Zhaolou Mine are simulated numerically. For the analysis of surrounding rock stability and supporting mechanism of deep well with high stress and large section chamber, the technical route is to realize the field application and monitoring of engineering by using laboratory test after consulting data and collecting documents. The deformation and failure law of surrounding rock and the reinforcement method of surrounding rock are obtained by theoretical calculation and numerical simulation. Then, the influence factors of surrounding rock stability of large section chamber in deep wells are analyzed by simulation. The factors that affect stability are classified as natural factors and human factors. Natural factors mainly include surrounding rock lithology, geological structure and in-situ stress, ground temperature and hydration damage, etc. Human factors include excavation and excavation construction, mining effect, construction quality, unreasonable design of support, etc. The composition of the surrounding rock, the basic mechanical parameters of the rock and the stress in a certain area of a large section chamber in a deep well are obtained by the analysis of the mineral composition in the laboratory. Using many test methods to provide parameter basis for the design of supporting scheme of chamber.) using numerical simulation software FLAC3D, the displacement deformation and plastic zone of surrounding rock in the central pump room under the conditions of bolting mesh spraying, bolting cable spraying and bolting grouting under different supporting conditions are studied, and the numerical simulation software FLAC3D is applied to the surrounding rock displacement deformation and plastic zone of the central pump room under different supporting conditions. Through the simulation analysis and comparison of bolt force and so on, it is concluded that bolting and grouting support can be used as a reliable support method for large section chamber under high stress conditions in deep wells. (4) aiming at the characteristics of large section chamber failure in Zhaolou coal mine under the condition of high stress in depth. And the actual engineering geological conditions. For the central pump room chamber, auxiliary well horse head door, cleaning coal chamber concrete support design scheme. 5) in view of the subject of follow-up research put forward some prospects. Due to the lack of a large amount of experimental data and a regular summary of engineering practice at present, further discussion is needed to improve the understanding of the surrounding rock properties of the condition, and the microscopic mechanism analysis of the engineering characteristics of the surrounding rock under high stress conditions is not enough. The law of fracture development and the microcosmic evolution process of water lithologic change need to be further analyzed, and different grouting materials are used according to the actual engineering conditions and field conditions, or the grouting materials with micro-expansion are used in the research.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD354

【参考文献】