Study On Foundation Stability Of High Fill In Suining Airport Northern Segment

Southwest Regional Airport located in the mountains, to meet the clearance conditions and site conditions, airport construction must be carried out large-scale cut and fill side. As the airport construction services in the economic construction, the construction of the airport to consider economic factors, traffic conditions, the general packing and gravelly soil excavation area, the packing characteristics of a direct impact on the stability of the high embankment. Hilly areas, multi-mudstone, mudstone with easy weathering, water softening disintegration characteristics. As a filler, the more uncertainty for the stability of the high embankment Therefore, in the beginning of the embankment design, we should attach importance to its stability analysis.The Suining airport runway length of2600m,45m wide. Filling of the study area the maximum height up to38.0m, is a high fill Airport, the north end of the study area and the victory weir reservoir near the leveling line from the library shore distance of only85m, maximum distance is only112m, while silty mudstone packing their own poor engineering properties of high embankment slope stability study is very necessary. Suining Airport, northern section of high embankment of the study, high fill side slope engineering geological conditions, the establishment of the geological background of the high embankment through the airport’s northern section, the study of the high embankment features, analysis of ground deformation internal mechanism. A generalized model of two-dimensional finite element numerical simulation software to analyze the deformation characteristics of the high embankment, the use of limit equilibrium and finite element method to study the slope stability of the fill, the following results:Research District silty mudstone filler in natural conditions, water-saturated conditions, compression tests and found that the cohesive force is too large, mainly because of its gravel soil of its own kind of "false cohesion "role in the fresh excavation broken to form a rich edges of the filler is particularly prominent, that the existence of such cohesion is reasonable.The use of two-dimensional finite element numerical analysis shows that the study area of ground deformation settlement compressive deformation foot of the slope at a shear deformation, tensile stress in the after edge of the cut and fill at the junction of the original foundation slope in the Settlement and Deformation at the same time Pull out the space, the transverse deformation of the soil and horizontal displacement. The stress concentration in filling the body with the Quaternary cover layer cross-interface region. Shear deformation of the premises, and Quaternary silty clay shear capacity is weak, the shear force transferred to the deep, the maximum shear strain concentrated in the foundation soil, the region most prone to deformation and failure, and easy along the The contact surface shear deformation occurs, cut out from the foot of the slope at.To analyze the deformation characteristics on the basis of the1-1model profile as an example the high embankment foundation in different slope angle, the intensity of the original foundation and water-saturated conditions, foundation deformation characteristics, and calculate the various regions of differential settlement deformation of the high embankment to make the appropriate assessment, and the corresponding engineering measures.The use of limit equilibrium and finite element method is most vulnerable to instability in the study area, two slope profiles3-3,4-4profile memory slope stability calculated,3-3slope in a variety of conditions are steady state in owed.4-4slope using limit equilibrium method to calculate the factor of safety, natural and toe water-filled7m slope is owed to a stable state, toe charge water14m, the slope in an unstable state; finite element numerical simulation algorithm shows that the slope stability poor, the safety factor K=0.744, the natural state in an unstable state, easily instability. Analysis of the reasons, combined with the slope of the geological conditions, the slope stability calculations, finite element algorithm is more reasonable.