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VACUUM ›› 2026, Vol. 63 ›› Issue (1): 103-108.doi: 10.13385/j.cnki.vacuum.2026.01.16

• Vacuum Technology Application • Previous Articles     Next Articles

Numerical Simulation of Excavation Stability of Deep Foundation Pit with Vacuum Negative Pressure Pile Anchor Support Under Complex Foundation Conditions

HU Bibo, TIAN Zhanfei, LI Shaochen, SHANG Enming, WANG Yao   

  1. China Construction Seventh Engineering Division Co., Ltd., Zhengzhou 450001, China
  • Received:2024-11-07 Online:2026-01-25 Published:2026-02-02

Abstract: Complex foundation includes conditions such as weak layer, karst area and variable geological structure. This type of foundation has problems such as heterogeneity of geological structure, uncertainty of stratum change and high groundwater level. As the key technology of deep foundation pit excavation, the stability of pile-anchor support plays a decisive role in engineering safety. To ensure the safety of deep foundation pit excavation, it is of great significance to study the numerical simulation method for the stability of deep foundation pit excavation under complex foundation conditions. Taking the deep foundation pit excavation project in a city commercial complex project as a research case, and based on the analysis of the geological conditions and soil characteristics of the deep foundation pit, the three-pile anchor support scheme and the corresponding application parameters are determined. Combined with the vacuum well point dewatering method, the vacuum pump is used to form a negative pressure in the well point tube to reduce the groundwater level. By improving the soil parameters of Mohr-Coulomb constitutive model, the element simulation properties of each structure of pile-anchor support are defined. Taking ten groups of working conditions as the boundary conditions of numerical simulation, the relevant numerical simulation under complex foundation conditions is completed. The results show that the change rate of pile top horizontal displacement is fast during excavation, and the horizontal displacement of pile top gradually increases with the advance of working conditions, but the horizontal displacement after stability is within the warning value. The soil excavation method of pile-anchor support has little influence on the surrounding strata, and the maximum settlement displacement value is also within the warning value, which has a certain stable excavation effect.

Key words: complex foundation, pile anchor support construction, vacuum well point dewatering method, earth excavation, numerical simulation

CLC Number:  TU473

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