Analysis On Stability And Protection Of Ion-type Rare Earth Mine Slope

In recent years,in order to meet the development demand,weathered and leachable rare earth ores have been continuously mined as the major source of rare earths,and in-situ leaching has dominated extraction,but in rare earth mining stopes where in-situ immersion techniques are used,There are hidden dangers such as landslides,mudslides,and other geological hazards that cause serious damage.The reason lies in the continuous injection of liquid and rainfall in the mining stope,which results in serious soil erosion,and changes in the properties and structure of the rock and soil such as moisture content and shear strength,and vegetation destruction.Instability in slopes has led to geological disasters such as landslides and collapses.Rare earth mines,such as landslides and other disasters,have a great impact on the working area of the mining area,the mining area and the surrounding environment of the mining area.Some mines are still undergoing production.There have been landslides and slopes where landslides have occurred.Due to the danger of landslides,it is of great significance to analyze the slope stability of rare earth mines and design simulations of effective support measures for slopes.This paper takes Longnan rare earth mine as the research object,carries out field geological survey in the study area to obtain geological survey data and samples for soil experiment.After measuring the rare earth mine leaching,the rare earth mine slope rock and soil moisture content,weight After obtaining the geological survey data and experimental data,the use of Midas GTS NX software to analyze the slope stability and ascertain the stability of the slope.At the same time,performance tests,microstructures,and particle size experiments were carried out on slope soils to analyze the effects of leaching and rainfall seepage on the properties of rock and soil.On this basis,the support measures for the slope protection of rare earth mines were designed,and the support effects were simulated and analyzed.The following conclusions were drawn:(1)By using the soil samples in the study area to compose the mud with different concentrations and determine the rotational viscosity.The results show that the viscosity ? and the shear stress are positively correlated.The greater the viscosity,the greater the shear stress,so the soil in the flow process to the surrounding The stronger the shear stress produced by the soil.The macroscopic performance is the movement under the hydrodynamic conditions such as mud and rainfall.The shearing stress of the fluid increases,which intensifies the erosion,shearing,and infiltration of water on the surrounding saturated rock mass,making the rock mass structure Changes continue to occur,which reduces slope stability.(2)After observing the visualization of the microstructure before and after the comparison of the soil samples,the results show that after soaking,the inter-particle pores are significantly changed and become larger due to the pore water pressure,and the morphology and composition of the cement between some particles and particles occur.Changes and loss of clay minerals are affected.Soil particles are weakened and the stability of aggregates is also weakened.The content of cement,the degree of cementation,and the cementation method will change,resulting in a change in the physical and chemical properties of the macroscopic soil.The result is that the compactness of the soil is weakened,and the values of c,? and so on are weakened,which has a greater negative effect on the stability of the rock and soil mass in the slope of the study area.(3)After analyzing the particle size distribution of soil samples,it was found that most of the soil in the study area was clay minerals with small particles,and the particles and cohesive particles were mostly bonded between the coarser particles.The weathering effect was obvious during the leaching and precipitation.After infiltration,the loss of some particles in the rock and soil is serious and the structure of the soil changes.In the weathered soil layer,the content of powder particles is small,and the content of medium and coarse particles is relatively large.The weathering effect of the soil layer is relatively weak,and the permeability coefficient is relatively large.It can provide a reliable channel for the infiltration of infiltration liquid and rainwater and increase the infiltration rate.The influence of rainfall and leaching on the rock-soil structure of slopes affects the slope stability.(4)By using Midas GTS NX software to simulate the slope under natural conditions,it was found that the safety factor was 2.4 and the slope was in a relatively stable stage;under the conditions of leaching and rainfall infiltration,the slope safety factors were 1.27656 and 1.05469,respectively.After the leaching conditions,the safety factor dropped drastically,and the slope was basically at the edge of a critical landslide.Under the influence of heavy rain,the safety factor continued to drop to a dangerous value,and landslides may have occurred.(5)Aiming at the complex conditions of rare earth mines in situ dipping mine slopes,combined with the research on slope instability mechanism,support engineering cost,ecological environment protection and other factors,it is proposed to use bamboo as the main material to make bamboo.An ecological slope protection structure consisting of a bamboo lattice frame and a bamboo reinforced body supports the slope before and after leaching.(6)By using Midas GTS NX software to simulate the slope protection,it is found that the safety factor of the supporting slope is 2.93125 under natural conditions,and the slope safety factor is 1.775 after leaching-rainfall,and the slope is stable.After being supported,sex gains considerable improvement and is basically stable,The ecological slope protection structure is simple in material,low in cost and easy to implement,and can serve rare earth mines.