Numerical Simulation Of Precast Pile Installation Basing On The ABAQUS

With the development of social economy, urban land is becoming more and more valuable. In order to make full use of limited ground resources, pile foundation has become a favourable foundation form in most of constructions. However, the precast pile have been produced in the factory due to its high quality, quick speed in construction, it has been widely used in the construction site. For the precast pile construction, it is need special consideration to reduce the impact on the surrounding environment during constructing in dense city area. As the squeezing effect will happen in the pile jacking, some adverse effects to the surrounding environment, the quality of the pile and the bearing capacity of the pile will appear. Therefore it is great significance to study the squeezing effect of the pile jacking. In this study, basing on the job of former researcher, numerical analysis has been carried out to study the pile sinking effect. Under the fully consideration of large formation, gravity stress of soil and other factors, mainly include the following content:(1) Numerical simulation using the displacement method, the static pressure method, hammering method for single pile sinking pile, the results show that the three methods of pile to soil compaction effect were produced by the similar rule, in the early stage of the pile, surface soil produces uplift pile attachment, within the scope of the distances from the center of the pile is about 0.5 d, when the pile sinking to 4meters get the biggest value, sinking pile was little influence on the surface. Radial displacement and vertical displacement of soil with the increasing of radial distance, in the form of logarithmic attenuation, and the closer distances from the center of the pile the attenuation degree. Radial displacement and vertical displacement of soil increases with the depth of pile, the pile tip rapidly rising then fell sharply, reach maximum at the pile bottom.(2) Based on the single pile, the numerical analysis was carried out on the piles, research results show that the elastic modulus, pile length, pile spacing, soil on the soil bulge phenomenon with similar rule, when the pile spacing for 4D, elastic modulus of soil is 20 MPa, pile length is 16 m. Soil bulge volume decreases with the increase of radial distance.(3) Based on the group of pile of tiny group of the existing pile foundation, pile sinking response is analyzed by numerical simulation. Research results show that the pile spacing is 6 D gets minimal impaction on existing pile foundation; Pile depth of pile foundation have been established. Compared with one sinking work, two sink piles has more effect on the existing pile foundation.