Study On Stress And Deformation Characteristics Of Stacked Slope Under The Action Of Prestressed Anchor Cable

With the continuous development and progress of science and technology,anchorage technology has been widely used in slope,foundation pit,tunnel and other projects.The action mode of anchorage is to bury the anchor rod or anchor cable under the stratum and closely fit the rock mass,so as to enhance the frictional resistance to prevent the slide of the rock block and achieve the purpose of strengthening the stratum.Anchorage is widely used in slope engineering,among which prestressed anchorage is more common.Under the action of prestressed anchorage,the stability of slope soil can be enhanced,and the natural disasters such as landslide and collapse can be effectively prevented.When the anchor cable or bolt is preloaded,the soil of the slope will produce deformation and additional stress,and deformation is the external manifestation of stress.In this paper,numerical simulation was carried out by FLAC3 D to simulate the action law of anchor cables in different soil slopes with concentrated tension,so as to obtain the action law of anchor cables with different soil properties and different prestress sizes.Taking the accumulation slope of a hydropower station in Yunnan Province as the research background,FLAC3 D is used to conduct numerical simulation to obtain the deformation data under the action of single anchor cable and multi-anchor cable,and the displacement change data is also obtained through the solution of Boussinesq theory.Then,it verifies whether the law of Boussinesq ’s theory can be applied in the accumulation body slope through drawing comparison and analysis of Origin.The main research results of this paper are as follows:1.For different types of rock and soil mass under the action of a single anchor,the soil near the anchor pier will have stress concentration.With the increase of tensile load,the area of stress concentration will increase,and the soil in the inner anchorage section will have a joint area of tensile stress and compressive stress,and the free end is the compressive stress zone.Under the action of group anchors,the compressive stress area at the end of the free end and the tensile stress area of the anchorage section will be superimposed.2.Single anchor cable anchorage state and mechanical characteristics and deformation law of slope is similar to other types of the slope rock and soil mass,but due to the relatively loose soil deposit slope is unstable,so when the anchor cable prestress of the deformation of rock and soil mass is bigger,and the stress is concentrated,due to the stress concentration in the surface layer of slope will make anchor pier surrounding rock mass stress is larger,The surrounding soil will also be squeezed,resulting in tensile stress,which has some negative factors on slope management.3.The boussinesq theory by single anchor cable in slope deposit under the action of deformation calculation is applicable in surface soil,three anchor deposit slope under the action of the surface layer of soil is also applicable to boussinesq theoretical solution for deposit slope anchoring result provides a set of reference data,the parameter design of anchor cable play a supporting role.Figure [37] Table [11] Reference [60]...