Failure Models Of Nearly Horizontal Rock Slopes With The Upper Hard And Lower Soft

January27,2006,a collapse disaster occurred in YaoYanJiao slope.HouChang, WeiNing country,about the size of5000m3,buried a private coal hole, fortunately caused no casualties. Combined Guizhou Provincial Department commissioned project "Guizhou geological disaster monitoring and early warning and decision support platform for research",I repeated with the research group carried out a site survey and related research. The survey found that the level of landslide disasters occurred in Nearly Horizontal rock Slopes with the upper hard and lower soft,and that place has5ancient landslide.This type of slope is typical southwestern slope types.Based on this,thesis select houchang slope an example of this type of slope deformation mechanism and conditions, I mainly get the following results:(1) Based on field surveys,analysis deformation-failure with the slope and reasons for the formation disaster.Figure out the slope of the geological structure of the area.This area of high and steep slope,there are three types of mode for slope instability in this region:dumping-cracking,flowing-cracking,creeping-cracking.(2) To better understand the analysis of the causes of disasters,we carried out some experiments physico-mechanical properties of rock,including uniaxial compression tests, direct shear test, tensile test, triaxial compression test, etc.Analysis of standard reference works Houchang rock slope rock mass quality classification for, and obtain the relevant physical and mechanical parameters. (3) Through the process of investigating the collapse occurred, collapsed accumulation body characteristics, collapse zone deformation characteristics and influencing factors of the investigation,I made a theoretical analysis of the formation mechanism of collapse,and the establishment of slope deformation and destruction "concept model", and according to this model to establish a computational model. Analysis of the case of coal mining in the lower slope of the stress and deformation failure mechanism of evolutionary mechanisms.I think collapse instability mode is "dumping-cracking" collapse.(4) We investigated the high slope of three dangerous rocks and a deformable body,and to analyze the deformation and failure mechanisms.According to the1-Rocks and2-Rocks establish a conceptual model,and establish a corresponding model to simulate.Simulate mining conditions at the bottom of dangerous rock mass stress evolution and deformation characteristics, and calculate the safety distance mining.(5) Through investigation and analysis features of the ancient landslide accumulation body, there are three deformation and failure modes of houchang ancient landslide:creeping-cracking, dumping-cracking, flowing-cracking.(6) For nearly horizontal rock slopes with the upper hard and Lower Soft,the natural state of deformation and failure mode has three-creep ing-cracking, dumping-cracking, flowing-cracking.Under the influence of human engineering activities has two;dumping-cracking, slumping-cracking.(7) Combined with houchang slope model, Analysis of mining conditions such lower slope instability mechanisms and safe distance by numerical simulation. When the exploitation rate is not the same, gob rate is higher, the higher the stress level of stress concentration areas, the easier slope instability, the greater the distance mining safety. When the shallower seams when the role of the soft layer is small, gob impacts a small range, mining safety distance is small; when seam deepened, increasing the role of the soft layer, gob increase the scope to influence, mining safety distance increases, the mining area can be reduced;when the seam to a certain depth, the soft layer thick gob of smaller, mining safety distance and begins to decrease,the mining area can be increased.