岩体分级RMR与国标BQ经验关系的应用研究

Study on Application of Empirical Relationship between Rock Mass Rating RMR and National Standard BQ

摘要: 岩体质量综合评价是指导岩石工程设计与施工的重要前提。本文首先对国内外岩体工程界最为常用的两类评价体系——岩体分级RMR和国标BQ进行了简单的介绍，并对两者的经验关系进行了简单的分析，最后利用两者之间的经验关系，采用岩体工程现场测试获得的BQ值对RMR值进行了预测。研究结果表明：1) RMR体系的评分指标更为细化，但存在对部分指标重复评分的缺点；2) BQ体系虽然评分指标很少，但岩体完整性指数这一评分项以间接的方式考虑了RMR体系中的诸多评分指标；3) 基于两者之间的经验关系，在已知其中一个指标的情况下可快速、准确地估算到另一指标，且两者对岩体质量的评级结果十分接近。

Abstract: Comprehensive evaluation of rock mass quality is an important prerequisite work for guiding rock engineering design and construction. This paper firstly briefly introduces the two most commonly used evaluation systems in rock engineering at home and abroad, namely, rock mass rating RMR and basic quality BQ, and then briefly analyzes the empirical relationship between the two systems, finally, based on the empirical relationship of the two systems, the RMR value is predicted by using the BQ value obtained from field tests of rock engineering. The results show that: 1) The RMR system is more refined on the rating index, but there is a shortcoming of repeated scoring for some indicators; 2) Although fewer rating indexes are involved in the BQ system, many rating indexes in the RMR system are indirectly considered in the rock mass integrity index scoring items; 3) Based on the empirical relationship between the two systems, another indicator can be quickly and accurately estimated when one of the indicators is known, and the rating results of the two systems on rock mass quality are very close.