岩体基本质量定量分级标准BQ公式的研究

Study of BQ formula in national standard of quantitative classification for basic quality of rock mass

自1995 年7 月1 日起,我国施行“工程岩体分级标准”GB50218 94 ,该标准为强制性国家标准。本文论证了该标准中岩体基本质量定量分级BQ 公式的主要问题:分级因素,分级挡数和分级模式。介绍了以9 变量103 项岩体工程的野外和实验室测试数据为基础,通过相关分析,聚类分析,逐步回归和逐步判别等多种数学手段获得 BQ

From 19950701 in China a forced standard for engineering classification of rock masses(GB 5021894) is exectued This paper deals with main results concerning quantitative classification for basic quality of rock mass: criterion for classification,number of classes and mode of classification formula.Based on field and laboratory measured data of 9 variables from 103 engineering projects,a formula used to calculate BQ index of basic quality of rock masses was obtained through sufficient mathematical analysis,such as correlative analysis,cluster analysis,reliability analysis,stepwise regressive analysis and stepwise discriminative analysis.