Stability Analysis Of High Steep Rock Slope In Fugu Section Of The Along Yellow River Highway

In recent years,with the rapid development of Fugu's economy,the pace of the construction of high grade highway is obviously accelerated.the Fugu section of the along Yellow River highway construction excavation form steep slope angle,the slope failure stress distribution of the original.Because of the combined action of the joint surface,the differential weathering,the rainfall and other factors,the instability of the rock mass in the middle-upper part of the slope appears.With the further strengthening of the degree of weathering,as well as the continuous erosion of torrential rain,may eventually lead to the overall collapse of the slope.Because of this trend,it is urgent to study the stability of rock slope in this area,so as to provide the basis for the support design of rock slope.Based on the above understanding,this paper takes the rock slope of Kl+255?K1+677 section along the Yellow River Highway as an example to analyze its stability and its supporting design scheme,The main contents and conclusions are as follows:(1)factors affecting the stabili,ty of rock slope were summarized from the internal factors(rock lithology,slope shape)and external factors(rainfall,weathering)two aspects,in the mean time analyzed the mechanism of various factors on the slope stability.In this paper,the stability of slope was qualitative analyzed by using stereographic projection method,and the deformation and failure mechanism of slope was qualitative simulated by UDEC software.(2)From the qualitative analysis,the joint surface damage to the overall stability of the rock,due to the interaction of the two groups of joints,forming a wedge slope;quantitative simulation in natural condition of maximum displacement of 5-1 'and 5-2' profile for 7.33cm and 20.72cm,the stability coefficient is 1.89 and 1.85.The maximum displacement of 5-1 'and' 5-2 'profiles is 7.68cm and 30.94cm,and the stability coefficient is 1.40 and The maximum displacement of 5-1 'and 5-2' section of the water saturated conditions for weathering + 3.48M,5.72m,stability coefficient is 0.89 and 0.88;the seepage analysis of slope of crannies charge water in 5m,10m,height 20m,the slope stability coefficient were 1.36,1.32,1.27,the maximum pore water pressure in the slope increased from 0.24Kpa to 0.60Kpa.(3)It can be concluded from the qualitative analysis that under the condition of thunderstorms or continuous rainfall,rain will infiltration along the joint surface,so that the phenomenon of instability and block falling to the slop will appear;quantitative simulation analysis show that the instability of slope is better in natural conditions.Under the condition of heavy rain,the rock mass near the 5-2 section will appear to be unstable,and the stability of the slope is general,which is consistent with the results of the qualitative analysis.The collapse of the whole body will appear in the weathering and water saturated condition.Seepage analysis shows that the pore water pressure increases with the increase of the height of the filling water,and the stability of the slope decreases with the increase of the height of the filling water.(4)based on the above analysis,the slope supporting design were given,supporting scheme one:clean up the rolling stones,dangerous rock + brush side unloading + net spray mixing + passive protective net + active protective net + drainage works;supporting scheme two:clean up the rolling stones,dangerous rock + net spray mixing + active protective net +passive protective net + drainage works;the supporting design scheme can also be used as a reference for the protection of the similar high rock slope in the area.