中文摘要：

在节理岩体工程的数值计算及稳定性评价中，强度参数的确定至关重要．在原位试验受到各种限制无法进行时，经验确定方法不失为一种好的选择，在大量收集国内外节理岩体强度参数经验确定方法的基础之上，提出了改进的节理岩体强度参数经验的确定方法，即对完整岩石进行“尺寸效应折减”与“节理化折减”的二次折减法，并应用于某坝址区工程实例中，所得的计算值与现场实测抗压强度值接近，较以往的经验确定方法更加准确，证明了节理岩体强度的降低是尺寸效应与节理化综合作用的结果，为节理岩体强度参数的研究提供了一条新的思路。

英文摘要：

During the course of numerical computation and stability evaluation on the jointed rock masses engineering, the determination of strength parameters is very important. When in-situ tests cannot be taken due to certain causes, the empirical determination is a good choose. This paper, based on collecting many empirical determinations of strength parameter for jointed rock masses all over the world, puts forward the improved empirical determination of strength parameters, that is to say, ＂size effect reduction factor＂ and ＂jointed rock reduction factor＂ of the intact rock specimen for the study on jointed rock mass strength parameter, and applies to the a typical location of the dam, which proves that this methodology is feasible and rational, and a new way for study of strength parameter in jointed rock masses is established.