Rapid sub-grade settlement predicting method based on static sounding and BP (Back Propagation) neural network

Abstract

The invention discloses a rapid sub-grade settlement predicting method based on a static sounding and a BP (Back Propagation) neural network, comprising the following steps of: obtaining a predicted field data sample, collecting a similar field data sample, establishing a BP neural network model, training and test the BP neural network model, and predicting a sub-grade settlement. A similar field static sounding test result, a field subsidiary stress and sub-grade settlement observation data are obtained as BP neural network training and test data samples for training the BP neural network repeatedly, when a difference between a prediction value and actual measurement data is smaller than a prescriptive standard, the predicted field data sample is input into the BP neural network model subjected to training, so as to obtain a sub-grade settlement prediction value. According to the invention, sub-grade settlement and deformation can be predicted scientifically and rapidly with an on-site static sounding test and a BP neural network simulation experiment, so that the rapid sub-grade settlement predicting method disclosed by the invention can be used for predicting various sub-grade foundation settlement and deformation in the civil engineering field.

Description

technical field [0001] The invention relates to the research on foundation settlement and deformation in civil engineering, in particular to a method for predicting subgrade settlement and deformation based on static penetration and BP neural network technology. Background technique [0002] Prediction of subgrade settlement and deformation is an important content in geotechnical engineering design. The existing roadbed settlement prediction mainly uses the engineering practical calculation method represented by the layered sum method and the finite element numerical calculation method considering the complex constitutive model of the soil to predict the subgrade settlement. The practical calculation method has the characteristics of simplicity and practicality, and is the mainstream method in engineering design at present. The disadvantage of this method is that the calculation parameters are mainly determined according to laboratory tests such as compression tests. The in...

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Problems solved by technology

The practical calculation method has the characteristics of simplicity and practicality, and is the mainstream method in engineering design at present. The disadvantage of this method is that the calculation parameters are mainly determined according to laboratory tests such as compression tests. The influence of the stress state, and the disturbance of drilling sampling also has a great influence on it, especially for the soil with strong structure

The numerical calculation method is relatively perfect in theory, and can consider soil nonlinearity, elastoplasticity, heterogeneity, and stress state, etc., but the biggest difficulty lies in the reasonable establishment of the soil constitutive model, and its calculation parameters are also derived from laboratory experiments. It is difficult to overcome the influence of sampling disturbance, etc. At the same time, due to the large error of the constitutive model and parameters, the final prediction result is also difficult to be accurate

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