There were also a lot of results on the research of trace length in the past. A large amounts of the former research paper on the orientation, size and density have been published, for example, an research on the orientation of discontinuous rock mass proposed by Mahtab, et al (1972, 1984), a study on the spacing of discontinuities was provided by S. 1984) and the discontinuous deformation analysis (G. 1995), the distinct element method (Lorig.
Three basic geometry parameters of discontinuities are the orientation distribution, size and size distribution and densities of discontinuities, these three basic parameters were emphasized to be studied in the research field of rock mechanics, engineering geology and geological disasters evaluation, it is a very important study for the evaluation of the stability of rock engineering and for the numerical modeling method in the research field of rock mechanics, such as 3-D numerical network modeling for the randomly distributed discontinuities in the rock mass (Kulatilake et al. The stability of rock mass or rock engineering is dominated by discontinuities developed in the rock mass.
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