| According to the related theories of slope engineering and rock and soil mechanics,a detailed investigation of the engineering geology,hydrogeology and rainfall of Puyang Open-pit Coal Mine No.1 dump was carried out.Through the field survey of the dump slope landslide and the slope monitoring data,combined The rock and soil properties,base form and slope structure of the dump site have determined the key factors affecting the dump site slope stability,analyzed the physical and mechanical parameters of the loose materials,and established the dump site slope mechanical model,revealing the difference The variation law of the safety factor of the dumping yard slope under the working conditions comprehensively evaluates the stability of the dumping yard slope,and the treatment plan of the dumping yard slope is optimized and determined.Based on the site investigation and monitoring data of the landslide of dump,the elevation change value,horizontal displacement and deep displacement monitoring point displacement of the surface displacement monitoring point are analyzed and evaluated,and the natural settlement of the dump material is obtained,and the displacement direction is controlled by the original topography.The slope is stable and there is no landslide,and it is generally in a stable state.The potential landslide failure mode is the shallow sliding in the form of arc in the dumped material;sliding along the contact surface between the dump and its base;sliding along the base of the dump with the combination of the above three failure modes.According to the engineering geology of the slope of Puyang Coal Mine No.1dump,the concept of zoning landslide mode was proposed.Based on the rigid body ultimate equilibrium theory,the foundation mechanics model of the dump was established.The calculation found that the stability of the foundation in the complicated slope engineering area(Zone I)of the dump is relatively poor,and it is easy to cut out the landslide along the silty clay layer.Based on the Morgenstern-Price method,Geo-studio is used to evaluate the slope stability of the No.1 dump in four working conditions: natural state,groundwater state,seismic state,and groundwater and seismic coupling state,and its seismic and groundwater coupling.The slope stability coefficient of the dumping site has the largest weakening range,and the slope is in a state of instability under this working condition.The current slope stability of the dumping yard is about 1.1,which is really close to the actual stability of the slope of the No.1 dump.Based on the strength reduction method and the Mohr-Coulom failure criterion,Rhino6.0 is used as the pre-processing for modeling,and FLAC3D6.0 is used as the numerical calculation software.Considering the influence factors of groundwater,a three-dimensional phreatic surface model is established,and the actual slope of the dump is obtained by numerical calculation.The slope stability coefficient is 1.214.The maximum horizontal displacement of the slope occurs on the wastes on the Quaternary clay and silt clay layer,and it shows certain settlement deformation.It is recommended that the whole bedrock drainage tunnel in the drainage plan for the bottom water area of the dump as the main plan for comprehensive treatment of the slope of the dump,and the low-lying local location is not conducive to the drainage treatment plan and the southern part of the dump has an inverted slope.The treatment plan that the steps collapse and block the drainage ditch is used as a supporting plan.There are 77 figures,22 tables and 104 references in this paper. |
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