| The mountainous area in southern Shanxi Province is one of the areas with high incidence of landslide disasters in China.The landslide-prone area accounts for 28% of the country's land area.According to relevant data,landslide disasters account for 89.4% of geological disasters,of which over 80% are landslides.Water is the main precipitating factor for landslides.Therefore,the study of the design of drainage system in the treatment of landslides in accumulation,and the effect of rainfall on the stability of the slope,is of great significance for the regulation and protection of landslides.The application of BIM technology can effectively combine the planar model and the spatial model,and can more clearly and intuitively represent the water system of landslide row(guiding)in three dimensions.This paper uses a SEEP/W module in Zhenan County of southern Shanxi as a research object,and uses the SEEP/W module in GEO-STUDIO to simulate the landslide model's rainfall intensity,rainfall duration,slope ratio,and soil permeability coefficient.Analysis of its impact on slope stability;and drainage engineering design based on the analysis of various factors.In the surface drainage,the two measures of drainage ditch and intercepting ditch are mainly designed;the simulation compares and analyzes the effect of whether there is an intercepting ditch on the drainage effect,the stability of the slope,and the influence of the position of the intercepting ditch on it.Underground drainage designed drainage holes,drainage holes,etc.;mainly studied the location of the drainage hole,the size of the diameter of the drainage effect and slope stability,as well asset the drainage hole and no drainage hole stability analysis.Thus,the suggestions for the optimal arrangement of drainage measures are given,and the BIM visualization function is used to simulate the drainage of the landslide in three dimensions.The following results are obtained:1)The influencing factors of slope stability are ranked as follows: permeability coefficient> slope ratio> rainfall duration> rainfall intensity,so the largest factor affecting slope stability is the soil permeability coefficient,and the minimum is the rainfall intensity.2)As the rainfall time prolongs,the stability of the landslide gradually decreases,and the volumetric water content of the slope gradually increases.The pore water pressure gradually increases from the slope to the slope,and finally,the pore water pressure tends to be uniform throughout the slope.3)Under the same rainfall conditions,the steeper the slope is,the smaller the corresponding slope stability coefficient is;but as the rainfall time lasts,the stability coefficients of different slope ratios tend to be consistent and the difference is smaller and smaller;rainfall time Consistently,the greater the rainfall intensity is,the smaller the slope stability coefficient is.Under the same conditions,the larger the permeability coefficient,the larger the corresponding slope stability coefficient;with the extension of rainfall time,the slope stability coefficient shows a decreasing trend.4)Under the same rainfall conditions,slopes with drainage measures are more stable than slopes without drainage measures,indicating that drainage has an important influence on the stability of slopes.In underground drainage measures,the larger the drainage hole(without causing physical deformation of the slope)is more conducive to drainage of the slope,and the corresponding slope stability coefficient is greater under the same rainfall conditions.The position of the drainage hole is close to the trailing edge of the slope body and the water level line.The drainage effect and slope stability are better than those of the drainage hole far from the water level line.The intercepting ditch is better placed on the slope foot than on the slope foot,and the slope stability is also high.5)Visualize the landslide drainage system visually and clearly using the visualization capabilities of the BIM technology. |
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