Analysis Of Factors Affecting Stability Of Reinforced High-filled Slope

In the southwest region,there are often construction problems caused by complex terrain conditions in the construction of mountain airports.In order to solve this kind of problem,mountainous airports in the southwestern region often use high filling methods to build the airport foundation.As an important form of high fill engineering,the stability of reinforced soil slope plays a vital role in the quality and safety of the entire project.Many scholars at home and abroad have made a series of researches on the stability of reinforced high-filled slopes,but in order to simplify the model,the research object is often special.In order to further obtain the influencing factors and influence rules of the stability of the reinforced high-filled slope,this paper takes the high-filled slope of No.2 ditch of Wushan Shennvfeng Airport in Chongqing as the basic research object,and uses centrifugal model tests and numerical simulation as means The effects of different fillers,different slopes,and rainfall conditions on reinforced soil slopes under the same reinforced form were explored.The main research results are as follows:?1?Testing the properties of the fillers under different grades.Through in-situ tests and laboratory tests,the properties of the filler such as non-uniformity coefficient,curvature coefficient,natural gravity,saturation gravity,cohesion and internal friction angle were obtained.The properties of the fillers were evaluated,and parameters were provided for subsequent centrifugal simulations and numerical simulations.?2?Tensile tests and pull-out tests are performed on the three types of geogrids used at the project site.The tensile strength of the three types of geogrids used at the project site and the interfacial friction characteristics of different grids with different filler moisture content and fillers were obtained through experimental tests.From the microscopic perspective,the influence of moisture content of different fillers on the interfacial characteristics of reinforced soils of different grids is obtained.?3?Simplify and scale the engineering prototype at a scale ratio of 130,obtain model fillers through scale gradation,calculate appropriate scale grid materials through scale ratio calculation,and use standard bricks and cement mortar to build the foundation.Rock to make a centrifugal test model.And the project prototype is extended to a total of 8 centrifugal models under 3 types of cross-variables,including 3types of slopes,2 types of grading fillers,and 2 types of conditions?natural conditions and heavy rain conditions?.The distribution conditions and changes of soil pressure,pore water pressure,grid strain and slope displacement in each model were tested by sensors.And by observing the experimental phenomena,we obtain the macro law that the variables affect the deformation and stability of the reinforced slope affected by the variables.Through comparison,it is found that in the course of the experiment,the deformation tendency of the reinforced slope often has the deformation tendency of"slope shoulder settlement-slope top crack-slope bulging in the middle and lower part of the slope surface".By monitoring the strain of the grid under natural conditions,it was also found that under natural conditions,with the increase of the slope,the potential fracture surface inside the slope changed from"arc-shaped"to"0.3H polyline"And it was found that under the same conditions,the rain conditions have a great influence on the stability of reinforced soil slopes with more fillers and fine grains.Therefore,the reinforced fill slope filler should not contain too many fine particles.?4?The PLAXIS numerical simulation software was used to simulate slopes with different slopes and different grades of fillers under natural conditions corresponding to the centrifugal model.Through analysis of the stress and deformation inside the numerical model,it was found that The potential rupture surface originated from the interior of the soil between the reinforcement near the slope foot,and the experimental results of the centrifugal model were compared and verified.And through 72 numerical simulations of 8 slopes and 9 grading fillers,it was found that the average stability coefficient of the reinforced slope is the smallest when the content of filler P₅?particle size greater than 5mm particle size?is 55%,and The slope stability under this gradation is more sensitive to slope changes,so a filler with a P₅of about 55%is the most unsuitable for reinforced fill slopes.?5?Geostudio numerical simulation software was used to simulate slopes with different slopes and different fillers under the grading storm conditions corresponding to the centrifugal model.Through analysis of pore water pressure,seepage vector and stability in the numerical model,it was found that The potential rupture surface of the reinforced slope tends to move inward;the slope has a greater effect on the seepage vector and the center of the seepage in the slope,and the filler has a greater effect on the pore pressure inside the slope.At the same time,it was found that the stability of the reinforced slope with more clay particles in the filler is more affected by rainfall when the slope is larger.