Abstract: The key of structural plane model mechanical test is to make similar surface morphology model sample to the natural rock structural plane. Based on the making particularity of rock structural plane in different scales，sample modes in series scales with perfect match to upper wall and bottom wall were developed; and the making process of model sample was designed. Through this, the natural rock structural plane can be used repeatedly, which will increase the using efficiency, reduce the sample cost and trial cycle. What’s more, the different scales of structural plane model making on the same natural rock structural plane are achieved. In the second part of the work, the similar evaluation results of surface morphology show: the model sample made by inverse controlling technology is capable of duplicating the same surface morphology of rock structural plane and highly match between upper wall and bottom wall model samples, which is suitable for the demand of making model samples in different scales. The inverse controlling technology is able to overcome the problems of low match to upper wall and bottom wall model samples and unable to get samples in multiscale of natural rock structural plane, which provides conditions for experimental research on shear strength scale effect of real surface morphology rock structural plane.

Key words: rock structural plane, inverse controlling, model sample, series scales, surface morphology, similarity evaluation