STRENGTH ESTIMATION OF COLUMNAR JOINTED BASALTIC MASS BASED ON GEOLOGICAL STRENGTH INDEX
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摘要: 节理岩体的强度是岩体工程设计的重要参数, 柱状节理岩体作为一种具有柱状镶嵌结构的特殊节理岩体, 缺乏相似的工程案例, 其岩体强度的确定是目前水电工程中的热点问题。本文综述了国内外相似工程中柱状节理岩体强度的研究进展, 以白鹤滩水电工程为例, 结合Hoek和Brown最新提出的地质强度指标法和强度准则估算了不同爆破损伤下的柱状镶嵌块状结构和柱状镶嵌碎裂结构柱状节理岩体的强度参数, 并得到白鹤滩水电站的原位试验成果的验证, 计算表明基于地质强度指标法的Hoek和Brown强度准则能较好的反映柱状节理岩体的强度参数。
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关键词:
- 柱状节理 /
- 岩体强度 /
- 地质强度指标法 /
- Hock-Brown强度准则
Abstract: The strength parameters of jointed rock mass are important to rock engineering design.The columnar jointed basaltic mass is special with columnar mosaic structure and the similar engineering case la cks.The strength of columnar jointed basaltic mass currently becomes an advanced research hotspot in hydropower project.This paper reviews domestic and international researches on strength of columnar jointed basaltic mass.Taking the columnar jointed basaltic at Baihetan Hydropower Station as an example, the GSI and Hoek-Brown Criterion are applied to estimate strength parameters of columnar mosaic blocky and cataclastic basaltic masses under different blasting damages.The result is proved by in situ tests at Baihetan Hydropower Station.It is concluded that the GSI-based Hoek-Brown Criterion can better reflect real strength parameters of columnar jointed basaltic masses. -
表 1 基于GSI估算的白鹤滩水电站柱状节理玄武岩体强度
Table 1. Strength parameters of columnar jointed basalt estimated by GSI at Baihetan hydropower station
表 2 岩体抗剪断试验成果
Table 2. Shear test results of rock mass
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