基于主控结构面锁固段模型的危岩稳定性计算

基于危岩体主控结构面地质结构特征,探讨了危岩体主控结构面模型中“规范法”和“贯通率法”在等效抗剪强度参数取值上的不足,提出了包含主控结构面贯通段和锁固段的危岩主控结构面计算模型。建立了基于主控结构面锁固段的三类危岩体稳定性计算的物理模型和力学模型,提出了三类危岩体危岩稳定系数计算方法。以重庆万州首立山5个典型危岩体为例开展了算例验证。分析结果表明,利用提出的计算方法得到的结果与原始勘探资料及2009~2013年现场观测资料相符合,弥补了重庆市地方标准在危岩体稳定性计算方面的不足,为规范的进一步修订提供了理论依据。

Analysis for unstable rock stability based on locking portion model of dominant fissure

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.