Construction Design of Pile Anchor Support in Deep Foundation Pit Excavation

This paper briefly introduced the deep foundation pit and deep foundation pit pile anchor support technology and then made a numerical simulation on the deep foundation pit excavation and pile anchor support structure of a high-rise building project in Xuantan community, Qianzhou street, Jishou, Hunan province, China. In addition to the original pile anchor support scheme, an optimization scheme was proposed in the case analysis. The height of the second row of anchors was adjusted from - 6 m to - 7 m, and the third row of anchor cable was adjusted from - 9 m to - 11.5 m. The simulation results showed that the error between the simulated value and measured value under different working conditions in the original scheme was within 1.22% ~ 2.21%, which had a high reference value in the engineering analysis, and the calculation model was effective. With the advancement of the working conditions, the overall horizontal displacement of the cast-in-place pile under the two schemes increased, and the original scheme had more increase, The horizontal displacement of the cast-in-place pile under the same working condition was smaller, and the position where the maximum horizontal displacement occurred moved up. The maximum settlement displacement of the surrounding surface of the foundation pit under the two schemes increased with the advancing of the working condition, the original scheme increased more. The maximum settlement displacement of the optimization scheme was smaller under the same working condition.