Stability Analysis Of Earth-rockfill Extended Dam Of Landfill Reinforced By Geotextile

In modern society,people’s living standards are constantly improving,and the output of domestic waste is also increasing.Existing landfills have been unable to meet the needs of today’s cities due to insufficient estimates of urban development,low economic benefits,and insufficient design capacity during construction.However,urban land resources are becoming increasingly tight,making it difficult to relocate new landfills.Therefore,it is an effective method to increase the storage capacity of the landfill on the basis of the original landfill.In this thesis,a series of large-scale direct shear tests are carried out to obtain the physical strength parameters of the soil and stone materials of the extension dam body,which is then simulated and analyzed by finite element software,taking the gravel soil reinforced geotechnical construction of the landfill dam stop project as the background.The engineering problems encountered in the extension of the dam.The main research contents and conclusions of this article are as follows:The design can be used for a large-scale inter-site test system.It can be used to construct an earth embankment in the same way as the dam construction,and carry out in-situ tests on site to obtain the physical strength parameters of the soil.In the field test,the particles with a pore diameter of more than 10 mm accounted for about 19% of the total mass.When the shear displacement of the sample was less than 5mm,the shear stress increased rapidly with the increase of the shear displacement,and then the shear stress gradually stabilized and slightly softened.Phenomenon,the shear stress-shear displacement curve has a slight sawtooth feature,and there is no double peak.The measured cohesive force c = 53.0k Pa,and the internal friction angle φ = 26.4 °.Carry out the compaction test on the soil required by the project to obtain the optimal moisture content and loosening coefficient.The engineering species should be controlled at the moisture content of cohesive soil ≤ 15%,the moisture content of cohesive soil mixed with stone powder is 16% to 22%,the moisture content of graded crushed stone is more than 22% or the rainfall is more than 10 mm and not more than 25 mm.Using finite element software to analyze the key factors that affect the stability of the dam,the calculation results show that the reinforcement spacing of the new dam body has a significant correlation with the overall deformation of the dam body.The reduction of the reinforcement spacing significantly reduces the displacement of the dam body;certain reinforcement of the garbage pile body can reduce the displacement of the garbage pile body.Due to the enhanced stress transfer effect,the displacement of the dam body will be increased to a certain extent.In addition,the strength of the connection cushion between the new and old dams and whether or not anchors are placed between the new and old dams will have a greater impact on the displacement of the dam structure.The greater the strength of the cushion,the smaller the displacement of the dam.Displacement and inhibit the expansion of the plastic zone between the dams;the strength parameters of garbage dumps change significantly with the depth and age of the landfill,and the displacement of the dam increases as the strength of the garbage dump decreases.Combining engineering examples,combining the results of finite element calculations and field results to analyze and evaluate the stability of the landfill,and the analysis of the finite element analysis results and the actual monitoring situation.The project provides a certain reference basis.