| With the development of China’s infrastructure to remote mountainous areas,the complex geological and environmental conditions have become an inevitable problem in the construction of infrastructure in mountainous areas.In the construction of mountain roads,road widening project is particularly common,and the stability of high and steep embankment slope artificially filled becomes more and more prominent.Therefore,it is of great value for the design and construction of the filled high slope to adopt a reasonable method to analyze the stability of the slope and propose an effective reinforcement design scheme.In this paper,the stability and reinforcement measures of high and steep embankment slope are analyzed and studied in combination with the practical road widening high and steep embankment slope engineering.The sensitivity of influencing factors of embankment slope was analyzed based on grey correlation analysis method.By means of numerical simulation,the stability of the slope during the filling process and the stability of the high and steep embankment slope under the condition of rainfall are discussed.The optimal reinforcement scheme was determined based on the terrain and geomorphology of the project site and the factors affecting its stability,and the reinforcement effect was evaluated based on the numerical simulation and monitoring data.The main conclusions of this paper are as follows:(1)The sensitivity of various factors affecting the stability of the embankment slope of the road is analyzed by the grey correlation method.The results show that the primary and secondary order of factors affecting the stability of the slope is: internal friction angle >cohesion > slope rate > natural gravity > slope height.(2)Midas/GTS software is used to simulate the stability of the original slope,and it is found that the shallow slip of the slope is more likely to occur in K0 + 065 ~ K0 + 130 filling section.Therefore,it is necessary to consider the influence of the slope filling process on the stability of the original slope,so as to provide some guidance for the determination of the filling construction scheme of the slope in the actual project.(3)Determine the filling scheme,and analyze the deformation law of the slope during the filling process by MIDAS / GTS software.The results show that the filling soil in the initial stage of slope filling has a presser foot effect at the foot of the original slope,which has a positive impact on the stability of the original slope.With the increase of the height of the filled slope,the sliding surface of the slope moves from the original slope to the filled slope,and with the increase of the filling height,the circular arc of the sliding surface increases,and finally the potential sliding surface is formed throughout the filled slope The stability of the filling slope is small,which is easy to lead to the overall sliding of the filling slope.(4)The displacement of the slope will continue to increase after a short period of heavy rainfall,and the maximum displacement under all conditions appears in the shallow slope of the embankment slope.With the increase of rainfall time,the displacement will increase.Inorder to ensure the stability of the slope after filling and the safe use of the widened road,the slope reinforcement measures need to take into account the overall stability of the slope and the phenomenon of shallow sliding.(5)The reinforcement measures of "pile sheet wall + graded backfill after pile + plain grid on the surface of fill" are determined as the reinforcement scheme of the embankment slope project.Midas / GTS software is used for numerical simulation to optimize the design of anti slide pile position,and the slope stability after reinforcement is evaluated by numerical simulation.The effectiveness of engineering reinforcement measures is verified with monitoring data. |
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