| Along with the economic construction development and constant investment in the national infrastructure construction,highway traffic construction has entered a new period of development.For the benefit of the Belt and Road Initiative,the transportation network has progressively come into being which puts the southwest area to the transportation hub position.However,in the construction process of the mountainous southwest advanced highways,developers are inevitably facing countless geotechnical slope stability problems.For the reason of excavation disturbance,the instability problem of the original slope has also become one of the technical problems in the process of highway construction.To solve the problem of slope instability,one should minimize the disturbance of the original slope as far as possible.Besides,developers should also utilize reasonable reinforcement measures,which are also effective methods to ensure the smooth working and operation of highways.This paper takes the Phoenix Mountain tunnel entrance on the left side of the slope as the research object.This study aims to analyze the stability of the slope in the condition of disturbance by using FLAC3D finite element analysis software.On this basis,the present study uses the fuzzy multiple attribute decision-making method to select the emergency reinforcement measures which are reliable in technology and economical.By using these measures,one can effectively guarantee the structure stability on the import part of the Phoenix Mountain tunnel slope,and also the safety and smoothness of Dali railway,the main research contents are as follows:(1)The slope instability in the opencut tunnel session occurred in the process of cleaning up the slope foot aggradation and inverted arch excavation disturbance,the present study collected and sorted out the geological environment data of the slope.Based on this step,the present study explored the characteristics of the slope landslide by using the geological radar detection technology.Meanwhile,the present study selected the range of the sliding and also affirmed the sliding depth of the slope.(2)In line with the practical situation,the present study used FLAC3D finite element analysis software.Then,the current study simulated the slope stability under different construction stages and established the safety coefficient change curve.After completing these steps,the present study comprehensively analyzed the dynamic stress and displacement characteristics from the original state to the excavation slope instability displacement characteristics and summarized the main factors of the slope sliding and provided corresponding measures.(3)On the basis of the original reinforcement measures,the present study selected a joint emergency reinforcement measure of spray of molten steel pipe grouting anti-sliding retaining wall plus anchor cable sash girder which is technologically reasonable and economical by using the method of fuzzy multiple attribute decision-making method.The present study also comprehensively analyzed the slope stability by considering the-safety coefficient of the slope under the condition of both fine weather and rainfall days and corresponding stress and deformation of the slope so as to evaluate the effects of the emergency strengthening scheme.(4)The present study placed corresponding displacement observatory in the emergency reinforcement slope and the present study also proceeded stability monitoring of the reinforced slope sliding reinforcement.The present study compared the results of the measured data and simulating evaluation so as to judge whether the slope is stable and verify the reliability of the slope reinforcement scheme.Practice proves that the slope is stable and the scheme is feasible. |
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