围岩中关键块体的真伪识别及具体位置的确定

A New Method to Distinguish the Key Block in the Adjacent Rock and Confirm its Location

石氏块体理论的基本假设中只考虑结构面的产状,而不考虑它在空间中的具体位置。所采取的赤平投影方法和矢量分析法均是平移结构面进行计算。因此,由其得出的某些关键块体由于其结构面长度的有限性并不是真正的关键块体而且关键块体具体的空间位置亦不能确定。本文针对上述不足进行了初步探讨,并给出了关键块体具体位置的确定方法。

The basic assumption of Shi＇s block theory only includes the dip and dip direction of the discontinuous surfaces without their specific locus. Two methods, the stereo-analytical method and the time-vector method used for calculation are ones through parallel moving discontinuous surfaces. So, many key blocks obtained from this theory aren＇t true because the length of discontinuous surface is limited and the specific locus can＇ t be determined. In this paper, a primary discussion is carried out on the limitation above mentioned and a method to determine the specific locus of key blocks is given.