国标《工程岩体分级标准》的应用与进展

ADVANCEMENT AND APPLICATION OF THE STANDARD OF ENGINEERING CLASSIFICATION OF ROCK MASSES

依据已发表的与《工程岩体分级标准》(GB50218—94)(简称《国标》)相关的各类文献成果的整理与分析,对《国标》执行以来的工程应用实践效果、《国标》与RMR,Q系统及HC法等分级方法的相关性、在行业标准制订上的推动作用、以及基于《国标》的研究方法进展及相关完善建议等进行总结和综述。基于多个工程200余组实测数据的统计分析,给出《国标》BQ值与RMR分值间的综合统计回归公式,对《国标》BQ法与RMR法级别划分的对应性进行验证。研究表明,该分级方法体系严谨,具有很强的科学性和可操作性。利用岩体基本质量指标BQ,减少分级的主观性,提高分级的精度,降低工作难度,方便不同设计阶段的工程应用。另一方面,在已有实践基础上,有必要对该分级方法作进一步的修订和完善。

Based on detailed analysis of all available literature and technical reports in China, a comprehensive review for advancement and application of the Standard of Engineering Classification of Rock Masses（GB50218-94）, ＂national standard＂ for short herein, is conducted. Moreover, practical effects for engineering applications of the national standard are evaluated. The relations between the national standard and other rock mass classification methods, including RMR（rock mass rating） system, Q system and HC method used in surrounding rock classification of hydroelectric projects in China, are described. In addition, promotion, advancement and suggestions, for some currently-employed professional standards and rock classification method in the framework of the national standard, are also proposed. Based on the statistic analysis of more than 200 sets of measurement data, a regression formula for rock mass basic quality（BQ） associated with RMR in the national standard is given; and the reasonability of the above-mentioned classification methods for rock mass is further validated. It is shown that rock evaluation system in the national standard is reasonable with strong scientific significance and flexible operability. By using the index of rock mass BQ in the national standard, artificial disturbance during site investigation can be significantly decreased, which can improve the accuracy and effectiveness of rock mass classification, and reduce the laborious work in field. The BQ method is also proven to be convenient for engineering applications at different design stages of projects, but with various experiences accumulated inactual engineering applications, modification of the rock classification method is needed.