| The study of slope stability has been of great interest in the field of geotechnical engineering and is a classic research topic.In order to study slope stability,it is necessary to start with the influencing factors.Geotechnical parameters greatly determine slope stability,where water plays an important role in the deformation and damage of geotechnical bodies and is one of the most important factors causing deformation,damage and stability of geotechnical bodies.Considering the effect of water variation on the mechanical properties of geotechnical bodies is of great significance to slope stability and has therefore attracted the attention and research of many scholars in this field.In this thesis,a comprehensive evaluation study on the geotechnical parameters and stability of the slope of the Muyin opencast coal mine in Indonesia is carried out by means of site investigation,physical and mechanical property testing,rigid body limit equilibrium method and FLAC numerical simulation calculations,etc.Taking the Muyin opencast coal mine in Indonesia as the research background,a comprehensive evaluation study on the geotechnical parameters and stability of the slope is carried out.The main results achieved are as follows:(1)The overall stability of the slope of the south end gang(1-1′ section)and the south section of the non-working gang(2-2′ section)is good,but with the gradual excavation of the 4 coal seam,the south end gang and the bottom plate of the 4 coal seam form a cascade slope with a long slow dip angle,and once the excavation face is formed,the rheological characteristics of the rock body will lead to the downward creep-slip deformation of the south end gang and the cascade slope with a long slow dip angle of the bottom plate of the 4 coal seam,further leading to the formation of the south end gang Tension cracks,surface water or groundwater into the tension cracks,will probably make the south end of the gang and the 4 coal seam base plate slow dip angle of the long smooth slope to form a flat slide,large scale,great danger,especially as mining to the west,the power plant is located in the south end of the gang,the consequences will be very serious,should pay great attention to.(2)The middle and north sections of the non-working gang(3-3′,4-4′,5-5′,6-6′,7-7′ sections),when excavated to +10m,0m,-10 m platform,are affected by the weak layer of the roof of the water barrier between 2 and 3 coal seams(the second type of weak layer),the slope as a whole is stable under storm conditions;under storm+ earthquake conditions,the overall stability coefficient of the slope is less than 1.3,which is basically stable;excavated to-10 m,0m,-10 m platform,the slope as a whole is stable under storm conditions.The slope is basically stable;when excavating to-30 m,-40 m and-50 m platform,with the increase of excavation depth,the slope is stable under the storm condition,and the stability coefficient is 1.05～1.28 less than 1.3 under the storm + earthquake condition,and the overall is less stable or basically stable.(3)In the north end gang(8-8′ section),when the excavation depth increases and the excavation reaches-50 m platform,the slope as a whole is stable under the rainstorm condition;under the rainstorm + earthquake condition,the overall stability coefficient of the slope is 1.05～1.16 less than 1.2,and the slope as a whole is less stable or basically stable.The thesis has 68 figures,40 tables and 116 references. |
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