双河煤矿采动巷道顶板裂隙的分形研究

发布时间：2019-03-14 08:38

【摘要】：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。
[Abstract]:The deformation of roadway roof is an important index to evaluate the stability of roadway roof. The fractal dimension of space between roadway roof fissures is an important parameter which comprehensively reflects the development and distribution characteristics of roof fissures, and tries to establish a mathematical relationship between them. The deformation of roof in mining roadway of Shuanghe Coal Mine is monitored by using multi-base point displacement meter. The development and distribution of cracks in roof are monitored by means of borehole television imager, and the fractal dimension of the spacing between cracks in roof is calculated. The results show that the fracture is the most developed within 0 m and 2 m of roof. Within this range, the fractal dimension of fracture line density and fracture spacing has the same change trend, and they have a linear relationship. The deformation of roof has the same trend as the fractal dimension of crack spacing. The fractal dimension of roof crack spacing increases and the deformation of surrounding rock increases. There is a linear relationship between them. The results show that the space fractal dimension of roof fissures is an index to comprehensively reflect the roof stability of roadway. It can be used as an index of roof stability of roadway to evaluate the roof stability of roadway and provide a reliable basis for supporting design.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;
【基金】：国家自然科学基金资助项目(No.51134018,No.51234005,No.51204187)~~
【分类号】：TD322

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