A Method for Determining the Position of Bottom Artificial Boundary in Calculating Heave Displacement of Foundation Pit Excavation

LIU Dong; PAN Danguang; SHEN Xingrui

doi:10.3724/j.gyjzG25081804

Volume 56 Issue 10

Oct. 2026

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LIU Dong, PAN Danguang, SHEN Xingrui. A Method for Determining the Position of Bottom Artificial Boundary in Calculating Heave Displacement of Foundation Pit Excavation[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(10): 224-230. doi: 10.3724/j.gyjzG25081804

Citation:

LIU Dong, PAN Danguang, SHEN Xingrui. A Method for Determining the Position of Bottom Artificial Boundary in Calculating Heave Displacement of Foundation Pit Excavation[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(10): 224-230. doi: 10.3724/j.gyjzG25081804

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A Method for Determining the Position of Bottom Artificial Boundary in Calculating Heave Displacement of Foundation Pit Excavation

doi: 10.3724/j.gyjzG25081804

1. Beijing Urban Construction Group Co., Ltd., Beijing 100101, China;
2. Department of Civil Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2025-08-18
Available Online: 2026-11-06

Abstract

Abstract

During foundation pit excavation， the position of the bottom artificial boundary significantly affects the calculation results of heave displacement. Existing methods for determining this position， whether based on a stress ratio or a deformation ratio， usually require trial computations. In this study， an analytical expression for the stress-based bottom artificial boundary position was derived by incorporating the stress diffusion angle. To address the lack of direct exploration data for deep soil parameters， a method for determining deep soil parameters was introduced based on the resilient modulus. Subsequently， a calculation formula for the deformation-based bottom artificial boundary position was established. Numerical results show that， for deep and large foundation pits， the stress-based bottom artificial boundary position is generally far beyond the exploration depth. The model established using the deformation-based artificial boundary position effectively balances computational efficiency with accuracy.
- foundation pit excavation,
- heave displacement,
- bottom artificial boundary,
- stress diffusion angle,
- soil parameters

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References(21)

References

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