Research On Seepage Stability Of High Fill Slope In Guizhou Petrochemical

Weak economic foundation of the western region with the country's western development strategy,the facilities construction has made rapid development.The western region,especially the Yunnan-Guizhou Plateau unique environment,geological conditions and rainy weather conditions,so that the construction of high mountain formed deepened fill slope stability problem is particularly prominent.Guizhou Zhijin petrochemical area high fill slope surface elevation 1200 meters,fill the design elevation 1250 meters,slope height 50 meters,is expected to fill up 4100 Articles.Based on previous research results,Guizhou Zhijin petrochemical high fill site formation works for the object,proven engineering geological and hydrogeological conditions of the study area;According to the analog visual modflow field of groundwater seepage field found in the study area the presence around the fill area,generally little effect on the natural groundwater flow field,the higher-lying area groundwater level changes within 1 meter,high embankment where large changes in water level,and the maximum of about 4 meters.Seepage field shows the original topography of the site after fill groundwater seepage field Redistribution greater impact.Using FLAC 3D software,combined with the seepage coupling mechanism to simulate three different conditions Zhijin petrochemical field area fill after the formation of high slope stability under rainfall infiltration conditions.According fill slope model can be drawn in under three different conditions rainfall intensity,with different slope rainfall infiltration time stress strain reflect different distribution characteristics.(1)In the first condition and intensity of rainfall is 25 millimeters per day,continued infiltration of rain.As the rainfall is small,small amount of rainwater infiltration,water interaction is weak,the shear strain increment is not sensitive to rainfall infiltration of slope rock and soil less affected.Shear strain increment mostly in the slope and the slope of the interface,the maximum shear strain increment of about 0.003,in line with slope deformation displacement field.(2)With the rainfall intensity increases,50 millimeters per day in the second operating mode,continuous rainfall infiltration after 24 h,the incremental shear strain and displacement field have a more substantial change.Maximum shear strain increment and the maximum displacement reached 0.0035 and 3.64 millimeters,slope foot part of stress concentration,may appear larger dislocation and affect the slope stability.(3)In the 180 millimeters per day working condition of heavy rainfall,slope after continuous rain infiltration function,quickly reaches a certain value,shear strain and displacement were 0.13,21 millimeters,the weakest appear a slope within a certain range of the slippage distance band.Once the storm continued,most likely fill slope in this weak zone degeneration destroyed slip instability.Slope stability is extremely unfavorable.(4)Combined with the limit equilibrium method and fluid-structure coupling calculation methods for high fill slope safety factor calculation,shows the rainfall infiltration of embankment slope stability has a great influence.Can be seen from the model prediction results,in the general conditions of embankment slope stability coefficient of more than 1 in a substantially stable state;Under heavy rain conditions,rainwater infiltration of rock and soil slope obvious impact,with strong rainfall continued infiltration,the slope may be weak zone of deformation and failure to induce sliding slope instability.Care must be taken to observe and monitor the development of the situation slope cracks and other structural strengthening perimeter slope and slope to intercept surface runoff rainwater seepage,slope protection in a timely manner and forecasting slope stability.