IS 13365-2-2019 巖體定量分類系統(tǒng) 指南 第2部分：地下洞室支撐壓力、支撐系統(tǒng)和工程特性預(yù)測(cè)巖體質(zhì)量（第一次修訂）
Quantitative Classification Systems of Rock Mass a€” Guidelines Part 2 Rock Mass Quality for Prediction of Support Pressure, Support System and Engineering Properties in Underground Openings ( First Revision )