Author(s)

Zhangbo Bai ¹, Xuanyi Zhang ¹, Yangang Zhao ¹

Affiliation(s)

¹ Beijing University of Technology, Beijing, 100124, China

Corresponding Author

Zhangbo Bai

ABSTRACT

Overall sliding failure is a critical failure mode in deep foundation pit engineering, and the reliability of overall sliding is a key component in deep foundation pit risk assessment. Due to constraints in investigation conditions, soil parameter data for foundation pit projects are often incomplete, making it difficult to accurately obtain statistical moment information of soil parameters. Traditional methods for analyzing the reliability of overall sliding in deep foundation pits require assumptions about the moments of soil parameters, which cannot fully reflect actual engineering conditions. To better assess the sliding reliability of real projects, this study employs interval descriptions of soil parameter statistical moments based on actual engineering investigation data. Combining interval reliability theory, an interval evaluation method for the reliability index of overall sliding in deep foundation pits is developed. Using actual engineering data, the reliability analysis and parameter analysis of overall sliding failure modes in deep foundation pits were conducted, exploring the influence patterns of soil parameters in different layers on the reliability index interval of overall sliding. The results indicate: under conditions of incomplete data, the reliability index interval for this foundation pit is [5.02, 8.18]; increasing the mean internal friction angle of the soil significantly improves the reliability index but also enlarges the interval length, with a sharp increase in interval length when the mean reaches 37°; an increase in the coefficient of variation of the internal friction angle reduces both the reliability index and its interval length; raising the mean cohesion increases the reliability index linearly but reduces the interval length, with relatively minor effects; an increase in the coefficient of variation of cohesion decreases the reliability index while expanding the interval length. For multi-layer soil conditions, the variability of parameters in deep and thick soil layers has a more pronounced impact on the overall reliability level and the credibility of the assessment.

KEYWORDS

Deep Foundation Pit; Bottom Heave; Reliability; Incomplete Data; Interval Reliability

CITE THIS PAPER

Zhangbo Bai, Xuanyi Zhang, Yangang Zhao. Reliability of Deep Excavation Heave Stability with Incomplete Data. Journal of Civil Engineering and Urban Planning (2026). Vol. 8, No.1, 143-154. DOI: http://dx.doi.org/10.23977/jceup.2026.080114.

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