大断面软岩巷道支护技术研究

发布时间：2019-06-13 17:05

【摘要】：毕节市煤炭资源丰富,以往煤炭开采小型煤矿居多,开采工艺为炮采和普采,回采巷道断面小。近几年随着煤矿兼并重组的推进,煤矿生产规模不断扩大,综合机械化开采要求更大的巷道断面。现有煤矿对大断面巷道认识不充分,技术经验欠缺,加之一些特殊的围岩条件,导致巷道维护困难。因此,针对毕节市煤矿实际地质条件开展大断面软岩巷道支护技术研究具有重要的理论价值和实际意义。本文以毕节市红林煤矿39110工作面运巷为工程背景,综合采用现场调研勘察、理论分析、数值模拟以及现场试验等方法,对大断面软岩巷道围岩变形破坏机理和特征以及支护技术做了系统的研究。论文阐述了巷道围岩变形破坏机理,分析影响大断面软岩巷道变形破坏的影响因素主要为巷道围岩岩性、巷道断面尺寸及形状和支护方式及参数。在此基础上,采用数值模拟详细研究分析了巷道断面尺寸对围岩应力、位移和塑性区分布的影响,揭示了大断面软岩巷道围岩变形具有来压快、变形速度快、变形量大和具有时间效应的特征。研究提出了针对大断面软岩巷道的锚网索耦合支护技术,并研究分析了不同的支护参数下,即锚杆间距、排距、长度、锚索数量变化的情况下围岩变形规律,最终确定了合理的锚网索支护参数。论文最后在红林煤矿39110工作面运巷进行了工业性试验,进行了一系列矿压观测分析,对巷道围岩变形量以及锚杆、锚索载荷的分析结果表明,巷道采用锚网索耦合支护方式及设计的支护参数下,巷道围岩变形量小,并逐渐稳定,巷道围岩控制效果显著。
[Abstract]:Bijie City is rich in coal resources. In the past, most of the small coal mines were small coal mines, the mining technology was blasting mining and general mining, and the section of mining roadway was small. In recent years, with the promotion of coal mine merger and reorganization, the scale of coal mine production continues to expand, and comprehensive mechanized mining requires a larger roadway section. The existing coal mine is not fully aware of large section roadway, lack of technical experience, coupled with some special surrounding rock conditions, which leads to the difficulty of roadway maintenance. Therefore, it is of great theoretical value and practical significance to study the supporting technology of large section soft rock roadway according to the actual geological conditions of Bijie Coal Mine. Based on the engineering background of roadway transportation in 39110 working face of Honglin Coal Mine in Bijie City, this paper makes a systematic study on the deformation and failure mechanism and characteristics of surrounding rock and supporting technology of large section soft rock roadway by means of field investigation, theoretical analysis, numerical simulation and field test. This paper expounds the deformation and failure mechanism of roadway surrounding rock, and analyzes the main influencing factors of deformation and failure of large section soft rock roadway are the lithology of roadway surrounding rock, the size and shape of roadway section, the supporting mode and parameters. On this basis, the influence of roadway section size on the stress, displacement and plastic zone distribution of surrounding rock is studied and analyzed in detail by numerical simulation, and it is revealed that the deformation of surrounding rock of large section soft rock roadway has the characteristics of fast incoming pressure, fast deformation speed, large deformation and time effect. The coupling supporting technology of anchor mesh and cable for large section soft rock roadway is studied and put forward, and the deformation law of surrounding rock under different supporting parameters, that is, bolt spacing, row distance, length and the number of anchor cables, is studied and analyzed, and the reasonable supporting parameters of anchor mesh cable are finally determined. Finally, the industrial test of roadway transportation in 39110 working face of Honglin Coal Mine is carried out, and a series of mine pressure observation and analysis are carried out. the results show that the deformation of surrounding rock of roadway is small and gradually stable under the coupling support mode of anchor, mesh and cable and the designed support parameters, and the control effect of surrounding rock of roadway is remarkable.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

【共引文献】