弱胶结围岩条件下邻近巷道掘进扰动影响因素

发布时间：2018-07-02 06:47

本文选题：扰动效应 + 巷道　；参考：《采矿与安全工程学报》2016年05期

【摘要】：深部开采条件下,弱胶结围岩条件下邻近大巷掘进相互扰动影响较大。针对弱胶结砂岩强度、相邻巷道间距、巷道间层位、巷道掘进顺序、巷道掘进错距等影响巷道掘进的扰动因素,采用理论分析和数值模拟等手段研究不同影响因素对巷道围岩稳定性影响规律。结果表明:1)随着水平间距逐渐变大,巷道周围应力分布逐渐规则,水平间距≥40 m时,先掘巷道围岩的变形量变化不大,巷道互相干扰程度逐渐减小;间距为20 m时,先掘巷道非对称变形严重,沿巷道掘进方向,先掘巷道右帮变形量是左帮变形量的2.4倍;2)邻近巷道间距不变,邻近巷道间垂直距离在-34~34 m范围内变化时,垂距为0时,巷间扰动效应最弱,巷间水平距离的增加则巷道间的掘进扰动效应明显减弱;3)巷道以左中右顺序掘进时,先掘巷道净移近量最小为15.2 mm,总变形最小为0.11 m,按左中右顺序掘进为最优方案;4)邻近巷道掘进前后错距为60 m时巷道关键点的位移变化率显著,左侧巷道围岩受扰动程度为右帮顶板左帮底板。在此综合分析基础上,提出巷道掘进影响因子并建立巷道稳定性评价指标,对巷道采掘及支护有一定的指导意义。
[Abstract]:Under the condition of deep mining, under the condition of weak cementation surrounding rock, the disturbing factors of the roadway driving are influenced by the weak cementing sandstone strength, the distance between adjacent lanes, the interval of the roadway, the order of the tunnel heading and the drift distance of the tunnel, and the different influence factors on the roadway are studied by means of theoretical analysis and numerical simulation. The effect of the stability of the surrounding rock shows that: 1) as the horizontal distance becomes larger and larger, the stress distribution around the roadway is gradually regular, and when the horizontal distance is more than 40 m, the deformation of the surrounding rock is not changed, the interference degree of the roadway is gradually reduced; when the distance is 20 m, the unsymmetrical deformation of the tunnel is serious, and the roadway is excavated first along the direction of the roadway. The roadway first digs the alley. The deformation of the right side is 2.4 times that of the left deformation; 2) the distance between adjacent lanes is constant, when the vertical distance between adjacent lanes is changed in the range of -34~34 m, when the vertical distance is 0, the disturbance effect between the lanes is the weakest and the increase of the horizontal distance between the lanes decreases the disturbing effect of the drift between the laneways obviously; 3) the drift of the laneway is moved close to the net first when the lane is heading in the left middle right order. The minimum amount is 15.2 mm, the total deformation is 0.11 m, and the best scheme is heading in the right order in the left middle right order. 4) the displacement rate of the key point of the roadway is remarkable when the error distance of the adjacent roadway is 60 m, and the disturbance degree of the surrounding rock is the left side floor of the right roof. On the basis of this comprehensive analysis, the influence factors of the tunnel driving are put forward and the alley is set up. The evaluation index of road stability has certain guiding significance for roadway excavation and support.
【作者单位】：北京科技大学土木与资源工程学院;内蒙古伊泰广联煤化有限责任公司;
【基金】：国家自然科学基金项目(51174015)
【分类号】：TD263;TD353

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