摘要
阐述了岩体力学参数研究的工程意义,介绍了国内外常用的几种岩体力学参数的确定方法,指出了Hoek-Brown强度准则和有关改进公式中存在的不足,建立了可以考虑岩体受扰动程度的修正系数Km,Ks,给出了Hoek-Brown强度准则的改进公式。修正系数Km,Ks由完整性系数Kv来表征,既能反映岩体受扰动程度,又方便获取,克服了Hoek-Brown公式和前人改进公式的不足。提出的改进公式,能够更好地确定介于扰动和未扰动之间的岩体力学参数。以厂坝铅锌矿岩体力学参数研究为例,分别用提出的改进公式和其他几种方法进行计算,结果表明,所提出的改进公式在确定介于扰动和未扰动之间的岩体力学参数时与实际情况更为接近。在对比研究的基础上,进一步说明了提出的改进公式的合理性。
The importance of study on mechanical parameters of rock mass, and some methods to determine mechanical parameters of rock mass are introduced. Hoek-Brown strength criteria is considered as the authoritative method to get rock mass mechanical parameters from rock mechanical parameters which are got from laboratory. While Hoek-Brown criterion does not give the calculation expressions for rock mass between disturbed and undisturbed. Zhang Jianhai finds this shortcoming and gives his modified expressions, however, only simple average treatment for Hoek-Brown criterion, and the disturbed degree of rock mass can not be described in his modified expressions. H. Sonmez and R. Ulusay consider the disturbed degree of rock mass and give their modified expressions, the shortcoming of Hock-Brown strength criterion and above modified expressions of which are pointed out： and the modificatory coefficients Km, Kswhich can take the degree of disturbed rock mass into account are constituted： then the modified expressions for Hoek-Brown strength criteria are brought forward. Km, Ks are based on integrality coefficient Kv, so they can not only reflect the distributed degree of rock mass, but also be got easily. The shortcomings of Hoek-Brown criterion and its former modified expressions are overcome. The modified expressions can determine the mechanical parameters of rock mass between disturbed and undisturbed better. The calculation is carded out through the modified expressions and other methods, respectively, where the study on mechanical parameters of rock mass from Changba Lead-zinc Mine. It is found that the modified expressions in this paper is more suitable to determine the mechanical parameters of rock mass between disturbed and undisturbed; and the result form this method is closer to the measured one. Based on comparative study, the rationality of these modified expressions is further explained.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第22期4030-4035,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重大项目(50490272)
国家"十五"科技攻关项目(2003BA612A–10–2)
中南大学博士学位论文创新工程项目(040109)
关键词
岩石力学
岩体力学参数
HOEK-BROWN强度准则
修正公式
工程应用
rock mechanics
mechanical parameters of rock mass
Hoek-Brown strength criterion
modified expressions
engineering application
作者简介
闫长斌（1980-），男，2001年毕业于中南工业大学建筑工程专业，现为博士研究生，主要从事岩土工程与地下工程方面的研究工作。E—mail：yanchangbin-2001@163．com。
