Abstract
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.
Highlights
In the process of urbanization, the number of buildings has increased, the area available for construction in an area is limited [1]
The height of the second row of anchor cable was adjusted from - 6 m to - 7 m, and the height of the third row of anchor cable was adjusted from - 9 m to - 11.5 m
The construction scheme of the supporting structure in the deep foundation pit excavation is as described above, and the foundation pit was monitored and data recorded during the construction process [16], including the horizontal displacement of the cast-inplace pile at different depths and the settlement of the ground around the foundation pit
Summary
In the process of urbanization, the number of buildings has increased, the area available for construction in an area is limited [1]. One of the manifestations is the loose soil at the edge of the pit, which will result in geological instability around the pit and cause geological changes such as ground subsidence and pit bottom uplift. It will increase the risk of construction, and reduce the stability of the building. A numerical simulation was carried out on the deep foundation pit excavation and pile anchor support structure of a high-rise building project in Xuantan community, Qianzhou street, Jishou, Hunan, China, using ABAQUS software. The height of the second row of anchor cable was adjusted from - 6 m to - 7 m, and the height of the third row of anchor cable was adjusted from - 9 m to - 11.5 m
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