Correction method for determining bearing capacity of cohesive soil foundation from shear wave velocity based on bp network

Abstract

This application provides a correction method based on BP network to determine the bearing capacity of cohesive soil foundation from the shear wave velocity, including obtaining the sample value of the shear wave velocity and the sample value of the standard penetration number of the site; performing regression curve fitting to obtain the first fitting curve; obtain the actual measured value of the shear wave velocity of the site, and input it into the BP network, and obtain the second fitting curve according to the predicted value output by the BP network; use the second fitting curve to correct the first fitting curve to obtain the calibration curve , find the corresponding standard penetration hit number, and use the standard look-up table to determine the bearing capacity of the foundation according to the obtained standard penetration hit number and the obtained measured void ratio. The invention utilizes the neural network to fully consider nonlinear factors after performing linear regression fitting, and corrects the fitting curve. Compared with conventional survey methods, it can greatly reduce the influence of external factors on the progress of geological survey, reduce the workload of in-situ testing physical objects, and provide a new technical means for better and faster determination of the bearing capacity of cohesive soil foundation.

Description

technical field [0001] The invention relates to the technical field of determining the bearing capacity of a high-speed railway cohesive soil foundation, in particular to a correction method for determining the bearing capacity of a cohesive soil foundation based on a BP network based on shear wave velocity. Background technique [0002] Railway construction is changing from quantity-scale type to quality-benefit type, and the construction area is gradually expanding to difficult and complex mountainous areas, forest areas, high-steep terrain, high altitude and other areas. More and more new railways have to pass through complex terrain and geological conditions. At the same time, it is also facing increasing environmental protection and construction period requirements. It is increasingly difficult for conventional exploration methods to meet the high-precision and tight construction period survey requirements of high-speed railways. Not only that, the terrain and geologica...

AI Technical Summary

Problems solved by technology

Among them, in-situ testing has a limited depth, which is time-consuming and labor-intensive; the theoretical formula method and the standard table method also rely on the samples obtained from drilling and in-situ test results. Difficulties Encountered in Railway Engineering Exploration

Moreover, these methods are often point-to-area, unable to obtain continuous geological results, fail to meet the needs of design accuracy and adjustment, and cannot determine the bearing capacity of the foundation at the specified location without drilling

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