岩体质量多因素综合评分方法效果分析

Effect Analysis of Multiple Factors Comprehensive Scoring Methods of the Rock Mass Quality

岩体质量是评价岩体稳定性的关键。简述了水利水电围岩工程地质分类法、岩体RMR系统分类法、Barton系统分类法等岩体质量多因素评分方法,并以某水电站右岸坝基某一开挖面为例,在综合考虑岩体强度、地下水、地应力、结构面参数、工程地质性状、风化卸荷,以及钻孔资料等的基础上,探讨了不同岩体质量多因素综合评分方法在岩体质量分级中的一致性和精确性。结果表明:以花岗岩为主的坝基开挖面,岩体质量分级采用岩体RMR系统分类法、Barton系统分类法较准确,且具有良好相关性。

Rock mass is the key to evaluate the stability of rock mass.This article briefly described the scoring methods of multiple factors including rock mass surrounding rock of water conservancy and hydropower engineering geology classification,RMR rock mass classification,and Barton system classification.Taking an excavation face on the right bank foundation of a southwest hydroelectric power station as an example,in comprehensive consideration of the multiple factors which were consist of rock strength,groundwater,crustal stress,structural plane parameters,engineering geology character,weathering unloading and borehole date and so on,the consistency and accuracy of different rock mass quality multiple factors grading methods in rock mass quality classification multiple factors were discussed.The results show that the main granite dam foundation excavation,rock mass classification by RMR rock mass classification or Barton system classification is more accurate,and has good correlation.