Study Of Stability Evaluation And Pre-reinforcement Method On Bedding Slope Based On Deformation

This thesis is based on the project of national science and technology support program(NO: 2015BAK09B01).The thesis analyzes the relationship between the deformation evolution law of the bedding rock slope and the stability of the bedding rock slope by combining the theoretical analysis with the model test,and explores the new type of support structure based on the deformation.The reinforcement effect of the layer rock slope.The main research work and achievements of the thesis are as follows:(1)Evaluation method based on the stability of the deformed bedding rock slope: under the influence of external factors such as excavation,rainfall,earthquake,and so on,the increase in the sliding force of the bedding rock slope or the decrease in anti-slip will cause the stability of bedding layer to decrease.The slope along the level of the bedding rock slope is generated along the slope,and the ratio of the shear displacement corresponding to the peak value of the shear strength of the layer is defined as the stability safety factor based on the dynamic displacement,and make judgments about the stability of bedding rock slope.(2)Let the shear bolt make the shear characteristics test: through the direct shear test on the structural surface,the changing law of the shear strength of the structural surface under different anchorage conditions and the changing law of the peak critical displacement are obtained.The shear strength of the structural surface without anchor bolts is provided by the structural surface itself;the shear strength of the structural surface of ordinary anchor bolts is composed of the structural surface itself and the shear resistance of the bolt itself,with the increase of shear displacement,the anchor is affected by the shear strength of the rod and produces the yield failure.In the early stage of the direct shear test of the shear bolt anchorage structure,the anchor rod body is not axially elongated by the shear force,and the normal stress increases the shear resistance of the structural surface.When the shear displacement increases to a certain value,the axial elongation of the anchor due to the shear displacement has not yet reached the yield strain of the anchor rod,and the rod itself begins to shear and yields under the shear force.(3)Experimental study of letting type anti-slide pile work performance: through the physical model test in the room,the displacement caused by the bedding rock slope under excavation and rainfall conditions and the lateral pressure acting on the anti-slide pile are obtained.For pressure-resistant anti-slide piles,because of the use of low elastoplastic materials,the pressure layer is allowed to allow the rock body to have a larger displacement along the sliding surface than the ordinary anti-sliding piles.The rock mass undergoes a certain amount of deformation,which is conducive to exerting the shear strength of the rock layer.Ultimately,the lateral pressure on the pressure-resistant antislide pile is smaller than the lateral pressure on the ordinary anti-slide pile.