Small strain model based method for analysis of pile responses induced by excavation

抄録

Estimating damage potential on buildings induced by excavations is required because more and more foundation pits are excavated near existing building. Thus, displacement control becomes a critical indicator of excavation design. Unfortunately, there is nearly no simplified method that can estimate the influence of excavation on existing building supported by deep foundations and can be easy to be used. Small strain behavior of soil should also be considered when establishing method to estimate influence of excavation on adjacent building for the strain of the soil is very small under displacement control design. In order to fit the requirement for simplified method to estimate the influence of excavations on existing buildings supported by pile foundations, a two-stage method is proposed herein to estimate the responses of piles adjacent to excavations. Firstly, the empirical method based on small strain behavior of soil proposed by Mu and Huang(2013) is employed to calculate three-dimensional free-field soil displacement induced by excavation. Then, an elastic theory method is proposed to calculate the vertical and horizontal pile responses in layered soil. The method is verified through comparison with results from FEM.