| It’s often quite difficult to develop infrastructure construction in red layers and other complex terrain areas in the Southwest, which has the most prominent contradiction between available land resources and the lack of " expanse ground" for large-scale projects, this means that dig earth to filled ditch will be an important way to solve the construction land in such mountainous areas, so, it is a key problem for safe and stable operation of engineering projects is the stability of high embankment.In this paper, the study object is a reinforced soil slope in south boundary of the airport. By summarizing research status and problem on reinforced soil slope at domestic and foreign, combining with on-site investigation, laboratory analysis, to master the geological background and influencing factors of reinforced soil slope instability in the study area, finally, reveals its mechanisms of deformation and destruction.Base on analysis of geological, it applies numerical analysis method to analyze the factors that affecting stability of reinforced soil slope. It explained that the reason of deformation and destruction phenomena from mechanism and internal causes. In geological analysis based on by numerical analysis method, the influence factors of reinforced soil slope stability analysis, studies the conditions of slope seepage field characteristics and stability characteristics of rainfall infiltration, and then to limit equilibrium method calculation as the research method, by changing the influence its stability on slope ratio, of stability coefficient changes through optimization analysis, both to ensure safety and combining economic reinforcement scheme. The main research results are as follows:(1) The destruction of the reinforced slope development process can be summarized as follows: Due to heavy rains led to increased slope, the filling body’s shear strength decreases, formed through the arc-shaped slip surface in slope, bypassing the sliding surface of reinforced earth retaining wall reinforced belt, cut from a softening of the toe. By preliminary judgment, reinforced soil slope instability model is weak shear slip base layer destruction, and rainfall infiltration is a causative factor of slope instability. Combining with the characteristics of slope deformation and destruction and influence factors of stability study, the slope integral sliding failure happened.(2) After the back pressure on the reinforcement measures of the slope, combined with signs of development trend and displacement monitoring and analysis of deformation and judged that the slope at the present stage is in the slow creep stage. The main causes of the slope governance but still deformation is strong rainfall.(3) With increase of rainfall duration, infiltration of rainwater into the slope, resulting in reinforced slopes in the underground water level elevation, the underground water level rising caused by seepage field changes and characteristics of seepage field determines the distribution of slope in matric suction and matric suction changes will lead to non-saturated soil anti shear strength changes, thus affecting the overall stability of the slope.(4) With the extension of rainfall duration, slope stability factor slowly decreased to a minimum value, then began to pick up gradually after the rain stopped.(5) Under the condition of natural conditions with a slope ratio of 1:0.25, slope is in stable condition, but the safety stock is low. From a security and economic point of view, slope ratio 1:0.5 is more appropriate. Because of the complexity of the engineering, heavy rain conditions to strengthen slope drainage, especially the slope internal water should be discharged in time so as to guarantee the slope stability. |
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