Geomechanical model tests on slope hazards of typical high bedding rock slopes

Based on the reinforcement engineering of the high bedding rock slope of Wanzhou Liangping Expressway,two models,among which one was reinforced and the other was not reinforced,were compared by geomechanical model tests.A method to simulate slope hazards of high bedding rock slope was given.During the tests,the influence of rain on slopes was simulated by the uniform capillary flooding method.The variation of displacement of slopes under excavation,rainfall and reinforcement and the variation of stress in anti-slide structures were presented.It was shown that,without anti-slide structure,the sliding mass moved in an accelerating pull type and the mass points on surface moved with a larger speed than that of the points in sliding body,but the effect of anti-slide structure could not only limit the displacement of sliding mass but also make the sliding mass moving in a push type.Rain fall caused a great loss of prestress of anchor wires.As for the anchor wires in anchor cable-pile,the percentage of loss was about 10%;repeated rain fall might have a disastrous effect on the long-term reliability of the structure with regard to the anchor wires in anchor frames.