Identification of Rheological Model of the Layer Composite Rock Mass and Its Application

摘要

The layer composite rock mass is composed of soft rock and hard rock. The difference of their mechanical characteristics is obvious. So it is difficult to describe comprehensively the complicated property with the existent constitutive model. Based on the rheological properties of soft rock and hard rock in the composite rock mass and the creep experiment curves, the rheological model can be used by connecting Burgers model in series with a plastic component. The rheological curves of the composite model under diverse stress level can be attained by multi-staged loading. The simulated result is proved good by comparing the theory curves and the experiment curves. The rheology principium of the complicated rock mass can be illuminated well by the model so that it could be popularly used in engineering practice.