Nondestructive testing method for compaction quality of rock-soil filled foundation

Abstract

The invention discloses a nondestructive testing method for the compaction quality of a rock-soil filled foundation. The nondestructive testing method comprises the following steps of: acquiring wave speed data of surface waves of the rock-soil filled foundation; calculating the macroscopic shear wave speed of a rock-soil mixed material; calculating the shear wave speed of fine grained soil in a rock-soil mixed material; calculating the dry density of the fine grained soil in the rock-soil mixed material to obtain characterization compactness; calculating the compaction quality of the fine grained soil according to the characterization compactness and a standard characterization compactness value; and the like. According to the nondestructive testing method for the compaction quality of the rock-soil filled foundation, which is provided by the invention, reasonable evaluation for the compaction quality of the rock-soil filled foundation is realized by testing the compactness of the fine grained soil; by means of the shear waves and the surface waves as test means, the integral compaction condition of the lower part of the foundation can be reflected and the problem of poor representativeness of a measuring point in a traditional method is avoided; in addition, the nondestructive testing method has the advantages of high detection precision, high speed, low cost and no damage to the foundation, thus the nondestructive testing method is a detection technology which can adapt to modern construction of civil engineering and has a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of construction, and in particular relates to a non-destructive testing method for the compaction quality of soil-rock mixed filling foundation. Background technique [0002] Due to the advantages of good mechanical properties, low cost and convenient local materials, earth-rock mixture has been widely used in foundation filling of large-scale infrastructure construction such as roads, railways, and airports in plateaus and mountainous areas. The quality of soil-rock mixed filling foundation compaction is directly related to the strength and stability of the foundation, and affects the service life and operation safety of these large-scale infrastructures, thus becoming one of the key factors determining the quality of engineering construction. At present, there are many testing methods for the compaction quality of soil-rock mixed filling foundation, and the common ones are density method, resistance testin...

AI Technical Summary

Problems solved by technology

Based on the above compaction quality detection methods, the density method suitable for fine-grained soil compaction detection can not be accurately determined when the maximum dry density is used for soil-rock mixtures, and for soil-rock mixtures with large discreteness However, it is difficult to take soil from a small test pit on site to represent the compaction status of the entire soil-rock mixed subgrade; although the resistance test method can measure the overall strength and overcome the representativeness of the sampling points on site, it is affected by the weakness of the original foundation. Therefore, it cannot truly reflect the compaction status of the filler, and it is difficult to formulate a unified compaction standard, which limits its development; the test engineering method can achieve better results for a specific project, but Due to the constraints of manpower, capital and other factors, it is difficult to promote on a large scale

Therefore, the above-mentioned traditional foundation compaction quality detection methods are difficult to reasonably evaluate the compaction quality of soil-rock mixed foundation.

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