【作者】 宋秀群；

【导师】 付厚利；

【作者基本信息】 山东科技大学 ， 岩土工程， 2010， 硕士

【摘要】 随着现代化矿井高产高效综合机械化开采技术的不断发展,煤矿的开采强度和规模大幅度增加,矿井开采不断向纵深方向发展,地质条件越来越复杂,地应力越来越高,煤矿巷道普遍存在着施工难度大、支护结构变形开裂、使用寿命短、修复率高等特点。同时,为满足矿井通风、运输及大型设备的安装等要求,巷道断面尺寸也越来越大。巷道埋藏深、断面大显著增加了支护难度,特别是在围岩松软破碎条件下,大断面巷道支护问题尤为突出,巷道极易出现冒顶、片帮和底鼓等,给巷道的维护带来了很大的困难,严重影响了煤矿的安全高效生产。高应力大断面破碎煤层巷道的支护技术已成为一个亟待解决的问题。论文以龙固煤矿北区胶带运输大巷支护问题为背景,在对工程特性充分认识的基础上,从研究高应力大断面破碎煤巷围岩变形破坏机理入手,详细分析了破碎煤巷的围岩变形破坏特征、变形破坏影响因素及破坏机理,并从力学角度对围岩变形机制进行了深入分析；在详细分析了巷道的支护理念及支护形式选择的基础上,提出了高应力大断面破碎煤层巷道的支护原则,并针对实际工程提出了重点加固两帮、帮角和顶板的固帮强顶注浆支护技术；通过UDEC离散元软件对破碎煤层巷道锚网索带喷注浆联合支护效果进行模拟分析,将理论分析和实际工程紧密地联结在一起,验证了滞后注浆加固技术的合理性;通过对滞后注浆加固特点进行分析,确定了主要注浆参数,并利用数值模拟方法对巷道支护锚杆的布置间距、锚杆长度、注浆压力及注浆加固范围进行了优化设计。通过上述分析和研究,本文建立了针对高应力大断面破碎煤层巷道支护的较为完整的理论体系和支护措施,对同类工程具有较高的参考和应用价值。更多还原

【Abstract】 With the development of full-mechanized mining technology with high production and high efficiency of modern mine, mining intensity and scale of mine increased greatly, mine mining gradually developing in depth, the geological conditions becoming more and more complicated and the in-situ stress increasingly high, all the above cause the phenomena of big construction difficulties, supporting structure deformation and cracking, short service life and highly repair rate universal existence. Meanwhile, in order to meet the need of ventilation, coal transportation, equipment installation and so on, roadway section also becomes larger and larger. The support difficulties significantly increased with deep burial and big section of the tunnel. Large section roadway supporting questions especially prominent, in the condition of it’s surrounding rocks weak and friable, which brings great trouble to the maintenance of roadway and seriously affected the safety and high effective product of coal mines. The supporting technology of broken seam roadway with high stress and large section has become an imperative problem to be solved.The paper uses the support questions of beiqu belt conveyer transportation tunnel of Longgu Mine as its background. On the basis of fully understand of its engineering characteristics, the paper firstly studied the surroundings’deformation and failure mechanism of broken seam roadway with high stress and large section, detailed analysis are made to describe the distortion and failure features, influence factors and failure mechanism of broken seam roadway, moreover, a deep analysis was made for the surroundings’deformation mechanism from the mechanical point of view. On the basis of detailed analysis of roadway supporting ideas and the selection of supporting form, the paper puts forward a supporting principle of broken seam roadway with high stress and large section. Also, the of reinforcing sides and roof grouting support technology, mainly reinforce the roof, two sides and bottom angle, was proposed according to the practical project. The supporting effect of bolt-net-cable-belt-shotcrete-grouting combined support was simulated and analyzed by UDEC distinct element analysis software, which closely connect with theory analysis and actual project, further verified the reasonability of lag grouting reinforcement technology. Finally, the grouting parameters were determined through the analysis of lag grouting reinforcement characteristics, and the method of numerical simulation was used to optimize the parameters of anchor space, anchor length, grouting pressure and grouting depth.Through the above analysis and research, the paper established a more complete theoretical system and support measures, which has higher reference and application value for similar engineering.更多还原