液压支架合理初撑力及其智能调控原理研究

发布时间：2018-06-30 20:10

本文选题：智能开采 + 合理初撑力　；参考：《中国矿业大学》2017年硕士论文

【摘要】：煤矿井下工作条件恶劣,安全隐患和危害职业健康的因素多,加强煤矿智能化开采装备技术的研究和应用,淘汰落后的开采方法和装备,引导煤矿向安全高效绿色开采方向发展,提升装备的自动化和智能化水平,逐步实现少人化、无人化开采是煤炭综采技术发展趋势和矿井现代化生产的必然要求。本文以煤矿开采的智能化、无人化为大背景,以支架合理初撑力的控制为切入点,通过理论分析、数值模拟、现场实测等方法进行研究,提出了支架合理初撑力的控制方式,并得出了以下主要结论:1)支架与围岩之间的受力关系将在支架的整个工作循环过程中处于一种动态平衡的状态。随着工作面的推进和顶板的运移,支架将持续受到顶板逐层传递的静载荷和阶段性的受到顶板断块运动而带来的动载荷的影响。2)支架的升柱初撑阶段为支架循环工作中唯一的主动控顶过程,合理大小的初撑力将对直接顶的离层及工作面“支架—围岩”系统整体刚度有较好的控制作用。3)通过数值计算,分析了不同工作阶段支架的刚度特性及控顶效果,得出当支架主要处于增阻阶段时,控顶效果最好;处于恒阻阶段时,支架整体刚度下降,控顶效果明显下降。4)通过数值模拟的对比计算得出:(1)支架初撑支护强度PS受到直接顶与煤层懫高比值N的影响。在工作面非来压期间,PS随着N的增大线性减小;在工作面来压期间,PS随着N的增大呈现出先减小再增加近似于抛物线的关系。(2)在工作面非来压期间,支架合理初撑支护强度随直接顶强度增大而应适度增加;在工作面来压期间,支架合理初撑支护强度随直接顶强度增大而应适度减小。5)通过数值计算分析及现场实测验证,得到了支架合理初撑力与其影响因素的关系,在对原有自动化控制系统进行分析的基础上,设计了支架合理初撑力参数判断和设置的流程。
[Abstract]:Working conditions in coal mines are poor, safety risks and occupational health hazards are many, the research and application of intelligent mining equipment technology in coal mines should be strengthened, and backward mining methods and equipment should be eliminated. To guide the development of coal mine towards safe and efficient green mining, to improve the level of automation and intelligence of equipment, and to gradually realize less artificial mining are the inevitable requirements of the development trend of fully mechanized coal mining technology and the modern production of coal mine. In this paper, the intelligent and unmanned coal mining as the background, with the support reasonable initial support force control as the breakthrough point, through theoretical analysis, numerical simulation, field measurement and other methods to study, put forward the support reasonable initial support force control method. The main conclusions are as follows: 1) the stress relationship between the support and the surrounding rock will be in a dynamic equilibrium state during the whole working cycle of the support. With the advance of the working face and the movement of the roof, The support will continue to be subjected to the static load transmitted by the roof layer by layer and the dynamic load caused by the movement of the roof broken block. 2) the initial bracing stage of the support will be the only active roof control process in the cyclic work of the support. A reasonable initial bracing force will have a good control effect on the overall stiffness of the "brace-surrounding rock" system of the direct roof and the face. 3) by numerical calculation, the stiffness characteristics and the roof control effect of the support in different working stages are analyzed. When the support is mainly in the phase of resistance increase, the roof control effect is the best, while in the constant resistance stage, the overall stiffness of the support decreases. The results of numerical simulation show that: (1) the support strength PS is affected by the ratio N of direct roof to coal seam height. PS decreases linearly with the increase of N during the non-pressure period of working face, and decreases first and then increases as parabola with the increase of N in the working face. (2) during the non-pressure period of the working face, the PS decreases first and then increases as parabola. (2) in the non-pressure period of the working face, The reasonable initial support strength of support should increase moderately with the increase of direct roof strength, and with the increase of direct roof strength, the support strength of support should be reduced moderately with the increase of direct roof strength during the working face pressure period. The relationship between the reasonable initial bracing force and its influencing factors is obtained. Based on the analysis of the original automatic control system, the flow chart of determining and setting the reasonable initial bracing force parameters of the support is designed.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD355.4

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