| China's overall land use planning clearly requires that we vigorously promote the process of comprehensive land consolidation,especially to strengthen the reclamation and utilization of mining wasteland.Mentougou District of Beijing is an important ecological conservation function area and key construction site of ecological restoration in mining area in Beijing.It is also a key prevention and control area of geological hazards.Its geological hazards are characterized by complex causes,scattered distribution,huge impact and difficult monitoring and control.From the point of view of land consolidation and ecological construction,it is undoubtedly of great significance to carry out a thorough investigation of hidden geological hazards in this area,and then carry out the reclamation and consolidation of abandoned industrial and mining areas.Taking Wangping Town in Mentougou District as the specific research object,based on the strength reduction principle,the Moore-Coulomb model is selected to evaluate and analyze the stability of Wangping Town waste rock dump by FLAC3 D.The main contents of this paper include: 1.Based on literature review,numerical simulation method is selected to simulate the collapse of gangue hill,including data pre-processing and geological body three-dimensional modeling by using ArcGIS and GOCAD,meshing and numerical simulation by importing FLAC3 D through interface program,and evaluation of the stability of gangue hill and calculation of its safety factor.2.Finite difference mesh is established based on FALC3 D,and the elastic-plastic pressure-strain analysis of gangue hill is carried out by using Mohr-Coulomb model based on strength reduction principle.Then,the deformation of the gangue hill is analyzed by the numerical simulation results to get the dangerous area.According to the dangerous area,the slope model is constructed and the safety factors of different slopes are calculated,and the simulated critical slope table of the gangue hill is obtained.3.Combining with field investigation and empirical research,the stability of the gangue slope in the study area is summarized and discussed from the aspects of gangue deformation and safety factor comparison,which provides suggestions and considerations for its treatment.Based on the above work,the main conclusions of this paper are as follows: 1.According to the numerical simulation of the whole region,the slope in the northeast is the most dangerous area.The relative height of the slope is 10 m,the horizontal distance is 18 m,and the bottom of the slope has about 4 m steps.2.The simulation results show that the stability of the slope is still acceptable at present.If the next step of slope treatment is done,the model data can be used for reference.According to the simulated critical gradient table of gangue hill,excavation in horizontal direction can only be carried out at a maximum of 5.5m depth,and accumulation in vertical direction at a maximum of 2.8m can ensure the stability of gangue slope.3.The results of this study provide a comprehensive solution for UAV to obtain high-precision data,ArcGIS,GOCAD,FLAC3 D multi-platform numerical simulation for complex geological bodies with complex morphology and large potential hazards,and have a good reference value for the risk simulation of basement collapse of mining wasteland reclamation in Mentougou area,Beijing. |
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