MODIFICATION OF HOEK-BROWN EXPRESSIONS AND ITS APPLICATION TO ENGINEERING
MODIFICATION OF HOEK-BROWN EXPRESSIONS AND ITS APPLICATION TO ENGINEERING
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发表时间：
2005
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通讯作者：
Xu Guo-yuan
中科院分区：
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作者：
Xu Guo-yuan
介绍了研究岩体力学参数的重要性，以及确定岩体力学参数的几种方法。Hoek-Brown强度准则被认为是从室内获得的岩石力学参数中提取岩体力学参数的权威方法。而Hoek-Brown准则没有给出扰动和未扰动之间的岩体的计算公式。张建海发现了这一缺点，并给出了他的修正公式，但对Hoek-Brown准则只做了简单的平均处理，不能用他的修正公式来描述岩体的扰动程度。指出了Hoek-Brown强度准则及其修正公式的不足，建立了考虑岩体扰动程度的修正系数Km、Ks，提出了Hoek-Brown强度准则的修正表达式。Km、Ks是以整体性系数Kv为基础的，不仅能反映岩体的分布程度，而且容易获得。克服了Hoek-Brown准则及其以前修正公式的缺点。修正后的公式能更好地确定扰动与未扰动之间的岩体力学参数。针对厂坝铅锌矿岩体力学参数的研究，分别采用修正公式和其他方法进行了计算。结果表明，本文修正后的公式更适合于确定扰动与未扰动之间的岩体力学参数，其结果更接近实测值。在对比研究的基础上，进一步说明了这些修饰语的合理性。
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. U1usay consider the disturbed degree of rock mass and give their modified expressions,the shortcoming of Hoek-Brown strength criterion and above modified expressions of which are pointed out;and the modificatory coefficients Km,Ks which 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 carried 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 disturbedand 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.