| As an artificial retaining structure,anti slide pile is widely used in the treatment of high slope engineering.In practical engineering,the rectangular anti slide pile with large section is often used.However,when the rectangular pile is used to reinforce the slope,it needs blasting and manual hole excavation,which has low efficiency and high risk.The circular pile adopts mechanical hole forming,which has the advantages of high construction efficiency,safety and economy.However,under the same cross-sectional area,the anti sliding effect of circular pile is not as good as that of rectangular pile.In view of this situation,a new anti slide retaining structure based on large-diameter circular pile,namely anchor cable cluster anti slide pile,is proposed.Aiming at this new type of anti slide pile,this paper studies the reasonable structural form of anchor cable cluster anti slide pile by means of numerical simulation.Through theoretical analysis,the calculation method of pile spacing based on rectangular pile combined soil arch and circular pile friction soil arch is proposed.Finally,through certain assumptions,the mechanical model of the new pile is established and its internal force calculation method is deduced.The main research contents and results of this paper are as follows:(1)Firstly,this paper gives the structural form of anchor cable cluster anti slide pile.Due to the rigid restraint of pile cap pier on pile top and the anchorage of rock mass on pile bottom,the cluster anti slide pile becomes a generalized anti slide pile with both ends consolidated.The numerical simulation results show that the anchor cable cluster anti slide pile has better anti slide effect than the anchor cable rectangular pile,and the reinforcement mechanism of anchor cable cluster anti slide pile on slope is analyzed.(2)Because the anchor cable cluster anti slide pile is to replace the large section rectangular anti slide pile,the equivalent conversion method between anchor cable cluster anti slide pile and rectangular pile is studied through numerical software to determine the diameter of each circular pile in a single beam.The results show that the anchor cable cluster anti slide pile based on the equivalent area conversion is more reasonable.In addition,the numerical simulation also shows that the structural layout of anchor cable cluster anti slide pile with internal clear spacing of 0.4m and internal clear row spacing of 0.5m is the most reasonable.(3)Through the finite difference software FLAC3 D,a two-dimensional numerical model is established to study the formation mechanism and influencing factors of soil arching effect between circular piles.The results show that the main reason for the formation of soil arching effect is the uneven displacement of soil between piles,and the pile spacing has the greatest influence on soil arching.(4)Based on the shortcomings of the existing theoretical research on rectangular pile and circular pile soil arch,the calculation method of reasonable pile spacing of rectangular pile under the action of combined soil arch and the calculation method of reasonable pile spacing of circular pile under the action of friction soil arch are proposed,which are verified by engineering cases.The results show that the method deduced in this paper is more reasonable than the existing methods.Finally,the effects of pile section parameters,cohesion and internal friction angle on pile spacing are discussed.The results show that the pile spacing increases with the increase of the above parameters,and the influence of parameters on pile spacing decreases under the action of large landslide thrust.(5)In this paper,the anchor cable cluster anti slide pile is divided into two parts up and down along the sliding surface.The loading section adopts the earth pressure method and the anchor section adopts the foundation coefficient method.The mechanical model of the anchor cable cluster anti slide pile is established,and the corresponding internal force calculation method is deduced.It is solved by MATLAB programming.Through an engineering case,the displacement,shear force and bending moment results of the finite element simulation are compared with the theoretical calculation results,The results show that both the numerical value and the trend are in good agreement,which verifies the rationality of the calculation method. |
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