频繁互层型砂泥岩地层地质强度指数GSI与裂隙密度ε间关系研究

发布时间：2018-11-12 12:07

【摘要】：以频繁互层型砂泥岩地层为研究对象,利用Hoek-Brown准则确定了砂泥岩样品的GSI,利用Biot相恰理论确定了各样品裂隙密度,探讨了GSI、裂隙密度ε及品质因子Q之间的关系。结果表明,GSI能在一定程度上表征岩体强度及宏观裂缝的发育程度,与裂隙密度ε具有一定负相关性。随着GSI增加,裂隙密度ε降低,品质因子升高。不同岩性GSI与力学参数如杨氏模量及三轴强度间相关性明显好于GSI与裂缝参数如裂隙密度ε及品质因子间相关性。表明对于砂泥岩频繁互层型地层而言,其中裂隙分布特征及声波衰减特征具有明显差异,因此在具体力学及裂缝交会图方面研究中,应区分岩性分别进行拟合。该研究揭示了不同尺度条件下岩石裂缝特征的异同,及利用力学和声学方法研究岩石裂缝特征的有效性。
[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.
【作者单位】：中国科学院渗流流体力学研究所;中石油勘探开发研究院廊坊分院;
【分类号】：P313.1

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