CHEN Xiang, SUN JinZhong, ZHANG Jiekun, et al. The Unloading Effect of Rock Samples and the Quality Evaluation of Engineering Rock Masses[J]. Journal of Civil and Environmental Engineering, 2009, 31(6): 53-59.
CHEN Xiang, SUN JinZhong, ZHANG Jiekun, et al. The Unloading Effect of Rock Samples and the Quality Evaluation of Engineering Rock Masses[J]. Journal of Civil and Environmental Engineering, 2009, 31(6): 53-59. DOI: 10.11835/j.issn.1674-4764.2009.06.010.
For most evaluating methods of engineering rock mass
the integrality index is an important assessment factor. However
sometimes the value of integrality index would be more than 1.0 because of unloading effect of rock samples and differentia of frequency between the measurements of rock samples and rock mass. In order to solve this problem
unloading index and frequency correcting coefficient were put forward to revise the integrality index. Moreover
the BQ evaluating method proposed in the national standard (GB 50218-94) was improved with the revised method. With the case study of the project of water sealed underground oil tank in Huangdao
it was found that the quality of rock mass in the site was grade I or II.