| This article takes the research object of the dump in Pingzi Village,Anning City,which is the proposed dump in the mine,in order to clarify whether the effects of rainfall and earthquakes will affect the later use of the dump.Under the conditions of rainfall and earthquake,the internal seepage characteristics of the dumping site in Pingzi Village,the internal stress and displacement changes of the slope under the coupled conditions of rainfall and earthquake,and the sensitivity of different influencing factors to the stability of the dump site Carry out research;and use it to determine the degree of influence of different working conditions and different influencing factors on the stability of the dump slope.First of all,according to the specific situation of Pingzi Village,relevant physical and mechanical tests were carried out on-site sampling to determine the relevant mechanical parameters of the soil in the dumping site.Using SPSSAU data online analysis software,comprehensively select 7factors affecting the stability of the dumping site to carry out the impact analysis,and carry out the ranking of the impact degrees of the influencing factors;strictly based on the experimental data and the real situation of the dumping site,the dumping technology research and Comprehensive use of two-dimensional and three-dimensional numerical simulation to analyze the effects of earthquake and rainfall conditions on its stability.The GEO-STUDIO software is used for foundation reinforcement treatment and two-dimensional seepage analysis under different rainfall conditions;with the help of Midas GTS NX software,a three-dimensional analysis model is established according to the surveyed actual terrain,and the stability change characteristics of the dump under different accumulation elevation conditions are analyzed.Provide a reference for the subsequent dumping of soil in the dumping site of Pingzi Village,monitoring of the dumping site,and landslide prevention.The specific research work of this paper is as follows:(1)According to the site survey and the design data provided by the mine,calculate the dumping parameters of the dumping site in Pingzi Village,and design the relevant stacking plan,and determine Pingzi Village after a brief analysis of the plan.Finally,the dump site uses multi-step covered dumping.(2)Consult relevant domestic and foreign references in Chinese and English,master the relevant basic theories of slope rainfall infiltration and seismic dynamic response,and provide a theoretical basis for later numerical simulations.In order to ensure the accuracy of the numerical simulation,a detailed survey of the current dump site was carried out,and the surrounding relationship of the dump site and the topography of the dump site were mastered.At the same time,a number of representative locations were selected for sampling,the samples were retrieved in strict safety-related test procedures for processing,the soil physical and mechanical tests were carried out,and the relevant physical and mechanical parameters were measured.(3)A total of 7 influencing factors,including bulk density,cohesion,internal friction angle,seismic intensity,slope water level,rainfall intensity,and soil permeability coefficient,are selected comprehensively,using SPSSAU data online analysis software,using orthogonal design and gray The two methods of correlation analysis are used to analyze the degree of influence of influencing factors on the stability of the dump slope.The order of the correlation(sensitivity)of the influencing factors is: internal friction angle>seismic intensity>severity>cohesion>permeability coefficient>rainfall>groundwater level.It can be seen that the physical and mechanical properties of the dumped soil have a greater impact on the stability,so the layered rolling method should be used in the stacking process to control the compactness of the soil at each step and increase the cohesion and internal cohesion of the dumped soil.Friction angle.(4)Strictly based on the experimentally measured data,with the help of GEO-STUDIO software for foundation reinforcement and two-dimensional numerical simulation analysis: First,the dumping yard is treated with foundation reinforcement.Based on the reinforcement model,the SEEP/W module is used to study the dynamic change process of rainwater and groundwater inside the dump slope under different rainfall types,different rainfall intensities,different rainfall durations and multiple rainfall conditions.Studies have shown that the migration of infiltration rainwater inside the Pingzi Village dump will reduce the stability coefficient of the dump,but the Pingzi Village dump meets the requirements of safety regulations under all rainfall conditions.Rainwater has an obvious erosion effect on the slope toe of the dump,and incremental rainfall and extreme rainfall(long-term rainfall and heavy rainfall)will have a transient saturated area on the surface of the dump,which is not conducive to the stability of the dump in Pingzi Village,Pay attention to monitoring and prevention in the later use process.With the help of the QUAKE/W module,the influence of different seismic intensities on the slope internal stress,strain,displacement,permanent displacement,displacement acceleration and other indicators under the seismic-rainfall coupling conditions is studied.Studies have shown that the Pingzi Village dump site is more likely to slip under the magnitude 9 earthquake,but the dump site's seismic intensity is level 8,and the overall seismic intensity meets the requirements for later safety production.(5)Use Midas GTS NX software to build a three-dimensional dump slope analysis model based on the real topographical conditions of the dump slope and Google Earth,and simulate and analyze the dumping process of the dump.It can be seen that The safety factor gradually decreases with the increase of the stack height,but the overall displacement and strain changes of the dump site are within the safe allowable range. |
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