工程岩体的超声波分类及强度预测

针对目前在岩石工程中广泛采用的隧洞围岩分类Ｑ系统和ＲＭＲ工程岩体分类，利用统计结果将岩体的超声波速与岩质量指数Ｑ和岩体分类指数ＲＭＲ联系起来，建立了由岩体超声波速估计岩体分类指数ＲＭＲ的计算公式，通过测定岩体的超声波可对岩体进行分类。为了预测岩体的变形及强度参数，引入Ｈｏｅｋ－Ｂｒｏｗｎ准则，给出了岩体变形及强度参数的预测方法。在三峡工程永久船闸高边坡岩体的应用中，超声波预测的力学参数与ＲＭＲ分类

THE ULTRASONIC IDENTIFICATION OF ROCK MASS CLASSIFICATION AND ROCK MASS STRENGTH PREDICTION

Rock mass classification and rock strength predication are widely applied in rock engineering. Several classifications have been developed for rock mass, e.g. the RMR and Q-system, and the Hoek-Brown criteria is the most accepted for rock mass strength predication. A combination of the RMR and Q-system is related to ultrasonic velocity based on the foregoing investigations and experience formulae, so that the rock mass elassification can be assessed according to the measured ultrasonic velocity of rock mass in situ. Also by the existed relationship between the RMR and Hoek-Brown criteria, a prediction for the strength parameters of rock mass is reached. An example taken from the Three Gorges Project of Yantze River has shown the application significance in rock engineering.