论文部分内容阅读
巷道顶板的变形量是评价巷道顶板稳定性的一个重要指标,巷道顶板裂隙的间距分形维是综合反映顶板裂隙发育、分布特征的一个重要参数,尝试建立二者之间的数学关系。利用多基点位移计对双河煤矿采动巷道顶板的变形量进行了监测,利用钻孔电视成像仪对顶板内裂隙的发育和分布状况进行了监测,并且计算出顶板内裂隙间距的分形维。结果表明,顶板0~2 m内裂隙最为发育,在此范围内,裂隙线密度与裂隙间距分形维具有相同的变化趋势,二者具有线性关系;顶板的变形量与相应的裂隙间距分形维具有相同的变化趋势,顶板裂隙的间距分形维增大,相应的围岩变形量增大,二者之间存在线性关系。研究结果表明,顶板裂隙的间距分形维是综合反映巷道顶板稳定性的一个指标,可以作为巷道顶板稳定性的指标,对巷道顶板稳定性进行评价,为支护设计提供可靠依据。
The deformation of roadway roof is an important index to evaluate the stability of roadway roof. The fractal dimension of roadway roof cracks is an important parameter that comprehensively reflects the development and distribution of roof cracks, trying to establish the mathematical relationship between the two. The deformation of the roadway roof in Shuanghe Coal Mine was monitored by using a multi-base displacement meter. The development and distribution of the cracks in the roof were monitored by a borehole television imager, and the fractal dimension of the crack spacing in the roof was calculated. The results show that the fractures are the most developed within 0-2 m of the roof. Within this range, the linear density of the fractures has the same trend as the fractal dimension of the fractures. The fractal dimension of the roof has a linear relation with the corresponding fractal dimension In the same trend, the fractal dimension of roof fissure increases, and the corresponding deformation of surrounding rock increases. There is a linear relationship between them. The results show that the fractal dimension of roof cracks is an index that can comprehensively reflect the stability of roadway roof. It can be used as an index to the stability of roadway roof to evaluate the stability of roadway roof, and provide a reliable basis for supporting design.