基于岩体爆破累积损伤效应的Hoek-Brown准则修正公式  

Amended expressions of Hoek-Brown criterion based on blasting cumulative damage effects of rock mass

作　　者：闫长斌[1] 李国权[1] 陈东亮[1] 刘振红[1] 刘建磊[1] 

机构地区：[1]黄河勘测规划设计有限公司,郑州450003

出　　处：《岩土力学》2011年第10期2951-2956,2964,共7页Rock and Soil Mechanics

基　　金：国家"十一五"科技支撑计划项目资助(No.2006BAB04A06);黄河勘测规划设计有限公司自主研究开发项目资助(No.2009-ky01)

摘　　要：爆破开挖作业引起的扰动与损伤,特别是频繁爆破产生的累积损伤效应,必然导致岩体完整性降低,岩体力学参数弱化,从而威胁岩体工程稳定性。考虑岩体爆破损伤及其累积效应,指出了Hoek-Brown(赫克-布朗)准则及其改进公式的不足,引入完整性系数K v和损伤因子D,建立了可以表征岩体爆破累积损伤效应、岩体爆破扰动状态及其力学参数弱化程度的mb和s的取值方法。基于声速变化与爆破累积损伤效应之间的联系,建立了以岩体声速降低率η为基准量的岩体爆破累积损伤扩展模型,并将该模型成功应用于提出的Hoek-Brown准则修正公式中。根据现场模拟爆破试验与声波测试数据,对提出的修正公式进行了分析,结果表明,建立的考虑岩体爆破累积损伤效应的Hoek-Brown准则修正公式是合理的。The disturbance and damage induced by excavation and blasting,especial blasting cumulative damage effects resulted from frequent blasting,will play down the integrity of rock mass,weaken the mechanical parameters of rock mass and threaten the stability of rock engineering surely.Considered the blasting cumulative damage effects of rock mass,the shortages of Hoek-Brown criterion and its modified expressions were pointed out.The methods of obtaining the value of and s which could reflect the blasting cumulative damage effects,blasting disturbed state and the lowering degree of its mechanical parameters,were found by introducing integrity coefficient and damage factor D.The cumulative expanded models of rock mass blasting damage were found with the baseline of rock mass sound velocity reducing ratio and the models were used in the amended expressions of Hoek-Brown criterion,based on the relationship between sound velocity variation and blasting cumulative damage effects.The analysis of the amended expressions was carried out based on the simulative blasting tests in-situ and the data of sonic measurement.The research results show that the amended expressions of Hoek-Brown criterion taken blasting cumulative damage effects of rock mass into account are reasonable.

关 键 词：岩石力学 爆破累积损伤效应 岩体力学参数 HOEK-BROWN准则 修正公式 

分 类 号：TU452[建筑科学—岩土工程]