【作者】 韩承强；

【导师】 张开智；

【作者基本信息】 山东科技大学 ， 采矿工程， 2007， 硕士

【摘要】 正确认识回采巷道围岩结构特征及其变形和破坏等矿压显现的机理及规律是有效进行巷道围岩控制的前提。本文根据不同的巷道布置方式及布置位置按两帮边界条件将区段巷道分为实体煤巷道、煤体——煤柱巷道和煤体——无煤柱（小煤柱）巷道（主要指沿空掘巷），针对三种不同煤柱宽度条件巷道，结合微山崔庄煤矿23上11综放面实际条件，在总结和研究大量区段合理煤柱参数确定方法的基础上，分别通过力学理论分析、数值模拟、现场实测三种研究方法，分析了三种巷道的围岩结构特征、受力条件及其在走向与侧向上主应力分布，塑性区扩展及位移变形规律，据此总结其围岩变形破坏机理。首先根据煤柱上应力分布规律，考虑到煤岩类介质的屈服受体积应力的影响，利用煤岩介质的极限平衡理论，艾里应力函数及广义米赛斯准则推导出了煤柱中塑性区扩展深度公式及护巷煤柱中部弹性区的临界宽度公式，分析认为煤柱中塑性区的扩展是由上至下，煤柱上的应力集中是造成其破坏的主要原因，讨论了各种因素对煤柱宽度的影响，计算得到适合崔庄煤矿的合理煤柱宽度为5.6m。其次运用FLAC^3D数值模拟软件分析了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。共设计了16个模型，分别模拟工作面推进10m、20m、30m、40m、50m、60m和煤柱宽度为4m、6m、8m、10m、15m、20m、25m、30m、35m、40m时巷道围岩变形破坏情况，分析认为，崔庄煤矿类似条件下，沿空掘巷合理的煤柱宽度应为6m～8m。最后通过现场观测，收集煤柱变形、应力分布和巷道变形等资料，认为小煤柱的破坏形态呈“不对称马鞍”状。更多还原

【Abstract】 Realize the surrounding rock structure character and the mechanism and law of itsdeformation and destroy exactly is the precondition to control it efficiency. This paper baseson the different lay system and different lay position divide the entry into three different kinds,roadway driving in integrated coal, roadway protected by big coal pillar and roadway drivingalong next goaf. To these 3 kinds of different coal pillar width situations, and combine theactual condition of 2311 full mechanized sublevel caving working face of Cuizhuang coalmine, use 3 kinds of research methods such as mechanics theoretic analysis, numericalsimulation and actual observation on-site analysis the surrounding rock structure character,stress condition and the main stress distributing, plastic zone development and thedisplacement distortion value in the line of strike and side direction. Based on these analysisthe mechanism of the roadway surrounding rock.First of all, based on the distributing law of stress on the coal pillar, considering that theyield of coal and rock class medium is influenced by the volume stress, using the limitingequilibrium theory, Airy stress function and the broad sense Mises yield criterioneducing the plastic zone development depth formula and the critical width formula of elasticrange in the middle of coal pillar. It shows that the development of the plasticity zone is fromtop to bottom, the main reason for the coal pillar’s destroy is the stress centralize, and also hasappraised the impact on width of coal pillar of various factors, and calculates the reasonablewidth of the protection coal pillar through the actual situation of 2311 working face at WeishanCuizhuang coal mine is 5.6m. Secondly, use the numerical simulation software analysis thedistributing of main stress, the development of plastic zone and the displacement ofsurrounding rock of different time segment, different coal pillar width. And we design 16models in all, simulate the roadway ground behavior and its surrounding rock deformationdestroy law when the advanced distance of working face is 10m, 20m, 30m, 40m, 50m, 60mand the width of coal pillar is 4m、6m、8m、10m、15m、20m、25m、30m、35m、40m respectively.It shows the reasonable width of coal pillar should between 6m to 8m. Finally, we disposedsurveyed area in the working face to observe, collect and analyze the data of the deformationfield and stress field of coal-pillar and the deformation of roadway surrounding rock. The observation result shows the destroy shape of the small coal pillar is "asymmetry saddleshape".更多还原