Analytical Models for Soil-Structure Interaction during Pipe-Jacking

摘要

Jacking forces are recognized to be an important parameter for the design and installation of pipes through pipe-jacking methods. Moreover, during pipe installation, significant stresses and deformation can develop within the pipes and pipe joints. In this paper, the so called "t-z" model is utilized for the solution of soil-structure interaction problem at a given stage of the pipe-jacking operation. In this model, the resistance along the length of the soil-structure interface is represented by a series of springs. For non-linear soil springs, the governing differential equation that describes the soil-structure interaction may be discretized into a set of algebraic equations based upon finite difference methods. This system of algebraic equations can be solved to determine the load-displacement behavior and internal stresses of the structural element when subjected to a jacking force.