Test research on negative Poisson's ratio of rock mass

Some polymer materials with negative Poisson's ratio had been developed, but negative Poisson's ratio effect was seldom observed for rockmass. Based on the first underconstruction undersea tunnel as engineering background, a brief introduction of indoor test on the rockmass specimens was given; and negative Poisson's ratio effect was observed during test. A new microcosmic deformation mechanism-lattic-rotation model which could interpret the observed test phenomenon was proposed; and a credible data proceeding method to obtain the actual value of Poisson's ratio was proposed too.