Mechanical Analysis Of Screw Pile Under Lateral Load

Conform to the rapid development of science and technology in the construction market, the emergence of a more advanced type of pile. Prefabricated screw pile. Compared with the other types of piles, it has high strength and good performance, it has changed the traditional straight pile soil pile interaction model, between blades of screw pile and soil forming synergy, so screw pile per unit volume of concrete can bear larger load.Prefabricated screw pile vertical bearing capacity and displacement of theoretical research has been a breakthrough, previous to the vertical compressive, vertical uplift and construction stage by force analysis has done a lot of research work, and summarizes some applicable conclusions. However, the relative lack of research on prefabricated spiral piles under lateral loads is currently limited to the design method of lateral bearing capacity based on the theory of back bending. With the use of the nonlinear method of p-y curve method under the vertical load of prefabricated screw pile by force mechanism is analyzed, and further enrich the theory of prefabricated screw pile under the vertical load calculation method.In this paper, the mechanical mechanism analysis of spiral pile under lateral load is mainly carried out in the following aspects:1. The theoretical calculation method is used to deduce the formula of the equivalent diameter of the spiral pile, and the general formula is derived.2. Use theory formula to calculate the p-y curve of the experimental model, establish ABAQUS finite element model is derived with different diameters of p-y curves of bearing force and displacement analysis, and to verify the applicability of the calculating formula of theoretical derivation.3. An engineering example of a spiral pile is selected, and the displacement, bending moment and soil resistance of the transverse bearing spiral pile in the engineering example are analyzed by using the formula of the equivalent diameter.Through the study, the following main conclusions are drawn:1.Based on the principle of equivalent stiffness, the theoretical formula of the equivalent diameter is of general applicability.2.The p-y curves of different diameter piles are not linear, but a nonlinear relationship.3.According to the engineering example, it is known that the pile length is an important factor to determine the stability of the pile. Screw pile spiral is not the difference between diameter and diameter, but in diameter and diameter of the appropriate ratio, diameter of the assembly will affect the equivalent diameter of the application, not the use of spiral pile spiral part of the role of play.