Triaxial shear tests on RSM Poisson¢s ratio with 10 kinds of rubber content and four kinds of confining pressure are accounted. Results indicate that：(1) Poisson's ratio of RSM with low rubber content shows similar behavior with pure sand，and Poisson¢s ratio values greater than 0.5 is observed due to dilatancy effect. For RSM with medium rubber content，its Poisson¢s ratio increases with axial strain or stress level monotonically. For RSM with high rubber content，the Poisson¢s ratio of it decreases firstly and then increases with axial strain or stress level. (2) The initial Poisson's ratio of RSM shows V type variations with rubber content，that is it decreases first and then increases with the increase of rubber content of RSM，and the turnover rubber content is proved between 35 percent to 40 percent. (3) The Poisson's ratio of RSM approaches to 0.5 in damage stage. (4) Confining pressure influences RSM Poisson¢s ratio slightly. The mechanism of RSM Poisson's ratio variation with rubber content and stress level is attributed to different stress bearing skeleton form by sand or rubber particle in RSM mixtures. Finally，empirical equations for estimation of RSM Poisson¢s ratio dependent on stress level are proposed，and comparison with tests results demonstrates that the proposed equations could simulate RSM Poisson¢ ratio properly.
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2017, Vol. 36 
