兰州地铁钻孔咬合桩设计优化研究

he finite element software ABAQUS is used to establish the finite element model of diaphragm wall which is equivalent to secant pile wall, and to simulate pile displacement and bending moment under the different working conditions of foundation excavation, then to analyze the effect of secant degree , pile section size, strength of plain concrete piles and ratio of embedded depth of piles of the retaining structure for Lanzhou subway pit on the pile displacement and bending moment. The results show that, Lanzhou subway pit adopting the secant pile wall supporting structure has applicability and can achieve safety target. This paper provides the suggested value of the secant degree, pile section size, ratio of embedded depth of piles and optimum strength grade of concrete of the plain concrete piles, which offers reference and guidance to the construction and design of the secant pile wall in Lanzhou subway pit.