Assessment of Parameters Effecting Stability of Secant piles wall Using Plaxis 3D

Secant piles wall is one of the suitable methods of wall construction, when deep vertical excavations are involved; is cast in situ before excavation is carried out. Technical and economical advantageous are considered for this technique. These piles are constructed in various forms, of them is secant form. In this paper, initially the stress and moment generated along the length and interface of soil-pile and being placed close to each other are presented. In continuation, parametric study of parameters effecting on behaviour of secant piles using Plaxis 3D Foundation software (Ver. 1.5) is conducted subsequently. Obtained results reveal the following points: Use of secant piles around trench specially with increasing internal friction angle (φ) cause reduction of displacements. Variation of displacements obey a constant trend, when value of φ≥40. Increase of value of parameters such as embedded depth (with lateral rigidity factor>0.01) and diameter of secant piles will result into reduction of their displacements. Value of piles spacing (s) increase with respect to their diameter (D) till value of s= 2.5D and then turn up to decreasing trend and finally reaches a constant value at s≥8D

Keywords:

Secant piles , model geometry , piles pattern and interface , lateral rigidity factor