【作者】 许岩；

【导师】 惠兴田；

【作者基本信息】 西安科技大学 ， 桥梁与隧道工程， 2009， 硕士

【摘要】 巷道围岩应力状态与矿井开拓布置以及煤柱留设尺寸有关。巷道布置方式、围岩的力学性质和结构特征以及次生应力状态等决定着巷道矿压显现的特征。传统的回采工作面设计方法是在巷道布置中将相邻工作面留设15～30米的保护煤柱,但这样会造成煤炭资源的严重浪费。因此在动压条件下采用合理的煤柱尺寸和巷道支护方案,有着重要的现实意义。本课题以韩城矿务局象山煤矿为工程背景,采用理论分析、数值计算和现场观测论证相结合的研究方法,从现场观测入手,分析研究了动压巷道围岩变形规律;通过分析动压巷道围岩变形破坏机理,确定动压巷道围岩的控制原则;通过FIAC^3D数值模拟软件,分析工作面回采不同时刻及不同煤柱宽度下巷道围岩在主应力分布、塑性区扩展及位移的变化情况;在分析锚杆索控制围岩机理的基础上,根据具体巷道的实际地质条件进行支护参数设计,并通过数值模拟,对设计巷道的支护参数进行检验;通过现场实测,对锚网索支护进行监测反馈。本课题结合象山煤矿11502采区实际情况,以研究成果指导生产实践,优化煤柱宽度,采用锚网索支护,并对优化参数后的经济效益进行分析。监测结果表明:受采动影响和移动性支承压力的作用,巷道矿压显现表现出一定的周期性;煤柱宽度为7m时,巷道处于应力降低区,且避开了侧向支承压力高峰区;根据自稳隐形拱理论提出的锚网索支护方式,解决了原有的工字钢支护不足的地方,提高了煤矿的经济效益。该课题的研究为动压作用下巷道围岩稳定性研究、煤柱优化设计与巷道支护设计提供了科学依据和实践经验。更多还原

【Abstract】 The stress state of roadway is affected by the mine exploit disposal and coal pillar dimension. Roadway disposal manner, mechanical properties and structural characteristics of the surrounding rock and the secondary stress state determines the pressure behavior characteristic. It is must waste the coal resource that left 20～30m coal pillar. Therefore how to adopt reasonable size of coal pillars and roadway support program on the dynamic conditions is important.This topic, based on engineering background of Xiangshan mining area, Hancheng, makes use of the method which is based on theoretical analysis and spot observation to research; According to observation on the locale, the paper analyses and researches deformation law of roadway under dynamic pressure; The paper use the numerical simulation software analysis the distributing of main stress, the development to Plastic zone and the displacement of surrounding rock of different time segment as well as different coal pillar width. Based on analysis for mechanism of bolting with wire meshes and cables controlling rock around roadway, and classification on rock around specific roadway and controlling principles, goes on design of supporting parameters; Through numeric simulation, goes on check up supporting parameters of roadway designing; Utilizing observation on the locale, goes on monitoring and feedback of bolting with wire meshes and cables.Combined with the subject of 11502 coal mining area, this topic makes use of research results to instruct production, optimizing the dimension of coal pillar, adopt bolting system, and analysis the economic benefits. Monitoring results show that: Affected by mining and mobile support of the pressure, mining pressure performs certain cyclical; The roadway locate in low stress area and avoid lateral supporting pressure zone when the coal pillar width of 7m; The bolting system which according to the theories of self-stabilized hidden arch solves the problem that I-steel can’t play a good supporting role. It also enhances economic efficiency. This topic provides a scientific basis and practical experience for the study on surrounding rock stability under the dynamic pressure, optimal design of coal pillar and design of roadway support system.更多还原