Correction method for determining bearing capacity of cohesive soil foundation through transverse wave velocity based on BP network

Abstract

The invention provides a correction method for determining the bearing capacity of a cohesive soil foundation through transverse wave velocity based on a BP network. The correction method comprises the steps of acquiring a transverse wave velocity sample value and a standard penetration test blow count sample value of a site; performing regression curve fitting to obtain a first fitting curve; obtaining a transverse wave velocity measured value of the site, inputting the measured value into the BP network, and obtaining a second fitting curve according to a predicted value output by the BP network; and correcting the first fitting curve by using the second fitting curve to obtain a calibration curve, searching the corresponding standard penetration test number, and determining the foundation bearing capacity by using a standard look-up table according to the obtained standard penetration test number and the obtained actually measured void ratio. According to the invention, after linear regression fitting is carried out by using the neural network, nonlinear factors are fully considered, and the fitting curve is corrected. Compared with a conventional exploration method, the method has the advantages that the influence of external factors on the geological exploration progress can be greatly weakened, the workload of in-situ testing of real objects is reduced, and a new technical means is provided for better and faster determination of the bearing capacity of the 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...

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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 Engi...

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