A Study On Displacement Of Pile Near The Abutment And The Subgrade Construction Of Deep Soft Soil Foundation At Bridge-Head

The foundation usually is high and wide, which is used to join road and bridge in freeway. Below the foundation, if it is soft soil, the foundation should be widen and higher during construction to deal with the soft soil. Under the effect of load, the settlement of subgrade will lead to the lateral distortion of soft soil. If the soft soil is deep, means the engineering characteristic of the soft soil is poor (saturated soft clay), the settlement and lateral distortion of soft soil subgrade will be very notable. The lateral distortion of soft soil subgrade at bridge-head jostles the soft soil in the area of slope-feet. When the lateral distortion of soft soil is large, inevitably, it will cause lateral load to pile. The lateral load effect largely the level displacement and curve distortion of pile foundation, it will lead to obvious flexibility distortion of pile foundation, further, it can cause structure destroy of bridge and pile foundation.Aim at the above problems, this paper summarize the existing available literature of soil pressure on passive piles, experiment conclusion and calculation methods. Based on it, site experiment was done in an actual project to study the question of the mutual effect of piles near the abutment and soil.Firstly, according to kinds of reference, this paper analyzes the study actuality of lateral distortion effect subgrade to the pile, summarizes the existing study conclusion about soil pressure on piles about the lateral distortion of soft soil, the experiment study on effect of extrusion soft soil to the piles and finite-element analysis. At the same time, the familiar distortion models of lateral distortion soil are summarized, the pile distortion mechanism is analyzed under different models, and the mechanism of causing lateral pressure on piles and several kinds of destroy models of piles are narrated.Secondly,The papersummarizes the familiar distortion model of lateral distortion soil, analyzes the pile distortion mechanism, under different models, narrates the mechanism of causing lateral pressure on piles and several kinds of destroy model of piles, and brings forward the hyperbola model and the elastic-plastic model on mutual effect and relative displacement between soil and piles.