The Study On The Plate Form Under Horizontal Force Affecting The Soil Failure Behavior Of The Extended-Pile

Based on the continuous innovation of squeezed branch pile,the Concrete Extended-Plate pile has changed the form of the previous branch,and a new type of pile has been adopted in the form of full section disk.Compared to the traditional equal diameter cast-in-place pile,it uses special drilling or expansion or rotary expansion pile machine to form a disc cavity in a good soil holding layer,which has the advantages of high bearing capacity,small settlement,cost saving and shortening the time limit,and has been gradually applied to practical engineering.At present,some achievements have been made in the theoretical research of Concrete Extended-Plate pile under horizontal load,but it is still in the initial stage,such as the plate form,the number of disc,the distance of disk and the position of the disk,etc.,these factors that affect the horizontal bearing capacity and the failure state of soil around the pile of the Concrete Extended-Plate pile needs further analysis.Because of the difference between the bearing disc formed by different pile forming machines in practical engineering and the form of theoretical design of bearing plate,therefore,this paper studies the effect of different plate form on the bearing mechanism of the Concrete Extended-Plate pile and the failure state of soil around the pile under the horizontal load by the small proportion model test method of the indoor original soil semi cross section and the ANSYS finite element software simulation.In the experimental study,the test method can be used to observe the state of interaction between pile and soil.The test results show that under the action of horizontal force,the pile and soil are compacted with each other,the region of the interaction is convergent in the shape of sliding line,the soil of the pile is gradually reaching the ultimate bearing capacity,cracking along the middle line,and through the comparison and analysis of the load displacement curve,the unsymmetrical form of bearing force is carried out.The plate is slightly larger than the symmetrical bearing plate on the horizontal bearing capacity,and the bearing disk end form has little effect on the horizontal bearing capacity of the Concrete Extended-Plate pile,which proves the applicability of the theoretical model of the calculation of the horizontal bearing capacity of the Concrete Extended-Plate pile in the actual pile.In the simulation analysis of ANSYS finite element,the data of load displacement and stress strain are compared and analyzed.The study shows that the influence of the different disc sections on the shear stress and the total soil strain in the pile is not significant,but the shear stress of the soil is greatly influenced,and the variation of the load displacement curve of the pile top is basically the same as the load displacement curve of the test.By comparing the model test with the finite element simulation,it is concluded that the simulation results are in good agreement with the test results in the range of error,and the accuracy of the finite element simulation is verified to a certain extent.In this paper,the theoretical results of the Concrete Extended-Plate pile under horizontal force are improved by the study of the bearing mechanism and the failure state of the soil pile under the different disk forms under the action of horizontal force,which provides a reliable theoretical basis for its application in the practical engineering.