| As a new bracing of foundation pit type, the bored secant pill wall contains two piles: A (reinforced concrete) and B (concrete) placed side by side. One pile cuts into the second pile, so the two are in direct contact with each other and form water tight wall. This method has the excellence of credible technology, agility economy and advantage construction, which is very suitable to the foundation pit retaining in soft soil area.According to the analysis of each monitored data in the process of excavation, applying finite element software to simulate the process of excavation, the paper analyzed the influence on the displacement and stress of the retaining wall by the thickness of the retaining wall, embedded depths of bored secant pill wall, support system, the ground reinforcement in the passive zone and vertical load of temporary steel bridge. Such conclusions were got:1 According to the domestic and foreign existing research of concrete secant pile wall, the paper summarizes the construction craft of concrete secant pile with the practical application in Xin Jie Kou subway station foundation pit;2According to the analysis of each monitored data in the process of excavation, systematically study the influence of excavation on deformation retaining wall, axial force of steel support, the settlement of surrounding soil and Buildings. The deformation characteristic is summarized, and different influence factors for deep foundation pit are induced and analyzed;3Making use of numerical software, the author analyses the influence on the displacement and stress of the retaining wall by the construction parameters (thickness of the retaining wall, embedded depths of bored secant pill wall, support system, the ground reinforcement in the passive zone and vertical load of temporary steel bridge).4According to the law of parameters of construction, the author advances designing method of bored secant pill retaining wall in vertical load, complements current pit design. |
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