Study On Shear And Moment Of Truss Anti-slide Pile Under Different Embedded Conditions

Because of the many mountains in Chongqing,high fill slopes often occur during actual project construction.In the support projects for high-fill slopes,ordinary cantilever piles are generally used to support high-fill slopes.However,due to the large sliding force of high-fill slopes and the limited bearing capacity of ordinary cantilever piles,safety accidents caused by lack of slope support often occur.In addition,only high-fill slopes are supported by cantilevered piles.Excessive costs will also be incurred and resources will be wasted.Wang Kai team based on the actual needs of the current project,put forward a new type of truss anti-slide pile support structure,and relying on the municipal research fund "a new type of truss anti-slide pile mechanical properties study" conducted a model of pile pushing test.In this paper,based on the model test of truss anti-slide pile,combined with the theory of sap2000 and vertical elastic foundation beam,using GTS finite element numerical software,the influence of different embedded conditions on the mechanical properties of trussed anti-slide pile is simulated and analyzed.In addition,the length of the main and secondary piles has been optimized.The main research contents and achievements are as follows:First,the truss type anti-sliding piles are divided into the upper structure and the embedded section.The sap2000 and vertical elastic foundation beams are used to calculate the bending moments of the main and sub-entry sections,and compared with the experimental bending moments,the difference is small.The calculation is biased towards safety,which shows that the combination of sap2000 and vertical elastic foundation beam is quite reasonable for calculating the bending moment of the embedded section of truss anti-slide pile.Second,using GTS finite element numerical software to simulate the stress characteristics of truss-type anti-slide piles with different embedded lithology conditions.Once again,the calculation method for the combination of sap2000 and vertical elastic foundation beams was verified.Force characteristics of trussed anti-slide piles under different embedded rock conditions.The results show that the lithology has certain influence on the displacement of the truss anti-sliding piles and the bending moment of the shearing beams.Under the same load,the better the lithology,the smaller the displacement of the truss anti-slide piles.The greater the shear moment is.Thirdly,according to the actual engineering conditions,the selected 0o,10 o,20o,and 30 o points of more research significance are used to simulate the situation that the truss-type anti-slide piles are embedded in different bedrock slope angles,and the situation of slope angles at different basement rocks is analyzed.The truss anti-slide pile displacement,shear force,bending moment.The results show that when the bedrock angles are 0o,10 o,and 20 o,the displacements,shear forces,and bending moments of the trussed anti-slide piles only change in value.The larger the slope angle,the smaller the displacement,and the more shearing and bending moments are.Big.When the bedrock slope angle is 30 o,the distribution of shear force and bending moment of truss anti-slide piles changes.Fourthly,according to the characteristics of main piles of truss type anti-slide piles being mainly pulled,and the secondary piles being mainly pressed,the length of the inserting length of the secondary piles is reduced,the length of the main piles is increased,and the length of the embedded sections of the main and auxiliary piles is optimized.The results show that when the length of the secondary pile is 6m,and the length of the main pile is 12 m,the main pile meets the anti-pull calculation and can fully display the bearing capacity of the truss-type anti-sliding pile.It is the best embedded pile for truss type anti-slide piles.long.