頻繁互層型砂泥巖地層地質(zhì)強(qiáng)度指數(shù)GSI與裂隙密度ε間關(guān)系研究
發(fā)布時(shí)間：2018-11-12 12:07
【摘要】：以頻繁互層型砂泥巖地層為研究對象,利用Hoek-Brown準(zhǔn)則確定了砂泥巖樣品的GSI,利用Biot相恰理論確定了各樣品裂隙密度,探討了GSI、裂隙密度ε及品質(zhì)因子Q之間的關(guān)系。結(jié)果表明,GSI能在一定程度上表征巖體強(qiáng)度及宏觀裂縫的發(fā)育程度,與裂隙密度ε具有一定負(fù)相關(guān)性。隨著GSI增加,裂隙密度ε降低,品質(zhì)因子升高。不同巖性GSI與力學(xué)參數(shù)如楊氏模量及三軸強(qiáng)度間相關(guān)性明顯好于GSI與裂縫參數(shù)如裂隙密度ε及品質(zhì)因子間相關(guān)性。表明對于砂泥巖頻繁互層型地層而言,其中裂隙分布特征及聲波衰減特征具有明顯差異,因此在具體力學(xué)及裂縫交會圖方面研究中,應(yīng)區(qū)分巖性分別進(jìn)行擬合。該研究揭示了不同尺度條件下巖石裂縫特征的異同,及利用力學(xué)和聲學(xué)方法研究巖石裂縫特征的有效性。
[Abstract]:Taking the frequent interbedded sand and mudstone strata as the research object, the GSI, of sand and mudstone samples is determined by Hoek-Brown criterion. The fracture density of each sample is determined by Biot phase coincidence theory, and the relationship between GSI, fracture density 蔚 and quality factor Q is discussed. The results show that GSI can characterize the strength of rock mass and the development degree of macroscopic fracture to some extent, and has a certain negative correlation with fracture density 蔚. With the increase of GSI, the fracture density 蔚 decreases and the quality factor increases. The correlation between different lithologic GSI and mechanical parameters such as Young's modulus and triaxial strength is better than that between GSI and fracture parameters such as fracture density 蔚 and quality factor. The results show that there are obvious differences in the characteristics of fracture distribution and acoustic wave attenuation for the frequent interbedded sand and mudstone strata. Therefore, in the study of concrete mechanics and fracture cross plot, the lithology should be fitted separately. This study reveals the similarities and differences of rock fracture characteristics under different scales and the validity of using mechanical and acoustic methods to study rock fracture characteristics.
【作者單位】： 中國科學(xué)院滲流流體力學(xué)研究所;中石油勘探開發(fā)研究院廊坊分院;
【分類號】：P313.1
本文編號：2327064
[Abstract]:Taking the frequent interbedded sand and mudstone strata as the research object, the GSI, of sand and mudstone samples is determined by Hoek-Brown criterion. The fracture density of each sample is determined by Biot phase coincidence theory, and the relationship between GSI, fracture density 蔚 and quality factor Q is discussed. The results show that GSI can characterize the strength of rock mass and the development degree of macroscopic fracture to some extent, and has a certain negative correlation with fracture density 蔚. With the increase of GSI, the fracture density 蔚 decreases and the quality factor increases. The correlation between different lithologic GSI and mechanical parameters such as Young's modulus and triaxial strength is better than that between GSI and fracture parameters such as fracture density 蔚 and quality factor. The results show that there are obvious differences in the characteristics of fracture distribution and acoustic wave attenuation for the frequent interbedded sand and mudstone strata. Therefore, in the study of concrete mechanics and fracture cross plot, the lithology should be fitted separately. This study reveals the similarities and differences of rock fracture characteristics under different scales and the validity of using mechanical and acoustic methods to study rock fracture characteristics.
【作者單位】： 中國科學(xué)院滲流流體力學(xué)研究所;中石油勘探開發(fā)研究院廊坊分院;
【分類號】：P313.1
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