关键词: 岩石力学, 稳定计算方法, 主控结构面模型, 锁固段, 危岩

Abstract:

Based on dominant fissure characteristics of unstable rock mass, we discuss the deficiencies in selection of equivalent shear strength parameters in "specification method" and "penetration rate method" of dominant fissure models of unstable rock mass, and a new dominant fissure analysis model that considers dominant fissure of cut-through portion and locking portion is proposed. Meanwhile, we build physics and mechanics models for the stability calculation of three types of unstable rocks based on locking portion of dominant fissure, and propose a stability coefficient calculation method for the three unstable rocks. Based on verification analysis of 5 typical unstable rocks in Wanzhou, Chongqing, it is indicated that the results obtained by the new method conform to the original exploration data and in-situ observation from 2009 to 2013. Thus the new analysis model makes up the deficiencies in stability calculation of unstable rocks of Chongqing local standard, and offers theoretical basis for further revise of the specification.

Key words: rock mechanics, stability calculation method, dominant fissure model, locking portion, unstable rock