【摘要】：巷道頂板的變形量是評(píng)價(jià)巷道頂板穩(wěn)定性的一個(gè)重要指標(biāo),巷道頂板裂隙的間距分形維是綜合反映頂板裂隙發(fā)育、分布特征的一個(gè)重要參數(shù),嘗試建立二者之間的數(shù)學(xué)關(guān)系。利用多基點(diǎn)位移計(jì)對(duì)雙河煤礦采動(dòng)巷道頂板的變形量進(jìn)行了監(jiān)測(cè),利用鉆孔電視成像儀對(duì)頂板內(nèi)裂隙的發(fā)育和分布狀況進(jìn)行了監(jiān)測(cè),并且計(jì)算出頂板內(nèi)裂隙間距的分形維。結(jié)果表明,頂板0~2 m內(nèi)裂隙最為發(fā)育,在此范圍內(nèi),裂隙線密度與裂隙間距分形維具有相同的變化趨勢(shì),二者具有線性關(guān)系;頂板的變形量與相應(yīng)的裂隙間距分形維具有相同的變化趨勢(shì),頂板裂隙的間距分形維增大,相應(yīng)的圍巖變形量增大,二者之間存在線性關(guān)系。研究結(jié)果表明,頂板裂隙的間距分形維是綜合反映巷道頂板穩(wěn)定性的一個(gè)指標(biāo),可以作為巷道頂板穩(wěn)定性的指標(biāo),對(duì)巷道頂板穩(wěn)定性進(jìn)行評(píng)價(jià),為支護(hù)設(shè)計(jì)提供可靠依據(jù)。
[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.
【作者單位】： 中國(guó)礦業(yè)大學(xué)(北京)資源與安全工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(No.51134018,No.51234005,No.51204187)~~
【分類號(hào)】：TD322

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