Deformation Monitoring And Stabilty Analysis Research On The Sliding Slope Of A Certain High Fill Airport

With the development of the western region, the rapid development of infrastructure construction, in order to improve the western mountain and hilly areas of the three-dimensional transportation system, many airports are built in these regions under this situation. Due to the special environment of mountainous and hilly terrain, airport construction is bound to encounter high fill deep problem, and the stability of the high slope directly affects the safety of the construction period and the operation period of the project.In this paper, based on a high fill airport slip slope engineering.Firstly, through the investigation and analysis of high fill slope related information at home and abroad, systematic analysis of the high slope deformation monitoring and stability analysis methods,prevention and control engineering research present situation, and objective summary of the slope deformation and failure characteristics, the forms and effects of slope deformation destruction of the main factors;Secondly,the airport was introduced in detail, especial terrain, weather, regional stratigraphic lithology, hydrogeological conditions, deeply analyzed the form of the high fill landslide, geotechnical characteristics, geological features, and the physical parameters of the landside obtained by the indoor experiment, according to the deformation monitoring of landslide surface displacement and deep displacement, the high fill slide slope deformation of space-time evolution and accurately determine the location of slip surface. Finally,the typical profile is selected as the calculation section, and the stability analysis is carried out by using the Midas/GTS finite element software. The main achievements and conclusions are as follows:(1) According to the results of laboratory tests, relative to the internal friction angle, cohesion is affected by moisture content and density significantly. The change of water content is low, the cohesion increases with the increase of the density,and the internal friction angle is relatively small. When the water content is changing, the moisturecontent and the intensity together determine the shear strength parameters.(2)According to the result of the deformation monitoring, the high fill slide slope spatial deformation has a typical characteristic of back-push slide deformation, based onthe obvious deformation of the different position of the inclinometer tube can be inferred that the position of the sliding surface is basically located in the silty clay or contact surface of silty clay layer and sandy mudstone layer.(3)The result of finite element numerical computation of this landside shows that under the common condition, the safetycoefficientof this landsideis 0.9375 and the rainfall condition safety coefficient is only 0.7375, which can notmeet therequirmentof safety design.According to the plastic strain zone, the position of the sliding surface is consistent with the measured value.(4)According to the results of finite element numerical simulation and deformation monitoring, reveals the high fill slope landslide deformation damage causes and mechanism, and puts forward the proposal of landslide treatment.