Deep foundation pit safety assessment method based on utility theory and D-S evidence reasoning

Abstract

The invention discloses a deep foundation pit safety assessment method based on utility theory and D-S evidence reasoning. The method depends on deep foundation pit project detection data, predicts the future state of a deep foundation pit based on the third-order Volterra series, and improves the prediction capability of a scheme on project potential risks. The fusion weight of the evaluation index is determined by adopting the variation coefficient and the information entropy, the representation effect of the index variation amplitude and the contained information amount on safety evaluation is considered, and the evaluation accuracy is improved; utilization of utility theories and D S evidence reasoning is used for safety assessment, and qualitative and quantitative analysis of project safety is achieved. According to the method, the finite length unit impulse response filter is used for simplifying the prediction model, model coefficients are reduced, and the state prediction speed is increased. According to the method, a complex evaluation model does not need to be established, a large amount of project risk data is not needed for model training, good scheme realizability and evaluation accuracy are achieved, intervention of too many expert personnel is not needed, and effective use and popularization of the scheme in the later period are facilitated.

Description

technical field [0001] The invention relates to the technical field of safety assessment of deep foundation pit projects, in particular to a deep foundation pit safety assessment method based on utility theory and D-S evidence reasoning. Background technique [0002] During the construction and later use of deep foundation pits, safety factors are complex and changeable. Timely and effective safety assessments and effective countermeasures are of great significance to effectively reduce the safety risks of deep foundation pits. Due to the complexity and differences of deep foundation pits, currently commonly used deep foundation pit project safety assessment methods are mostly based on expert experience or on-site investigation methods to achieve qualitative analysis, combined with some quantitative analysis methods to make a rough safety assessment classification, Or set a certain safety alarm threshold for some important indicators to avoid serious accidents. The above-me...

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