A Vibratory Compaction Test Method for Railway Subgrade Filling

Abstract

The invention relates to a vibration compaction test method for a railway subgrade filler. Soil samples with various typical water contents are prepared; the optimal vibration frequency capable of compacting the current soil samples at the fastest speed is tested; a combination of best dead weight mass and eccentric block mass capable of compacting the current soil samples at the fastest speed istested; a vibration compaction instrument is arranged with the optimal vibration frequency and the combination of the best dead weight mass and the eccentric block mass, vibration compaction parameters of the soil samples are analyzed and compared with site compaction parameters, vibration parameters are selected, a compaction test is carried out on the soil samples with all the water content, thedry density is tested, and the water content corresponding to the soil sample with the highest dry density of the soil samples is obtained as the optimal water content; and the optimal vibration parameters, the combination of the best dead weight mass and the eccentric block mass, the optimal water content and the maximum dry density are output. The vibration compaction test method can match thesite vibration compaction parameters, and the site construction is guided on the dry density under the condition that the compaction parameters of the vibration of the filler is consistent to that ofa site.

Description

technical field [0001] The invention relates to the technical field of railway roadbeds, in particular to a vibration compaction test method for railway roadbed fillers. Background technique [0002] By the end of 2018, the operating mileage of my country's high-speed railways exceeded 29,000 kilometers. Subgrade engineering is an important part of high-speed railway infrastructure, and the length of the line accounts for a large proportion. The quality of subgrade engineering construction has an important impact on the operation of high-speed railways. At present, the main filling method of subgrades at home and abroad is formed by vibratory rolling with road rollers, and the service performance of subgrades is closely related to the quality of vibration compaction. The degree of compaction during subgrade compaction requires a packing compaction (or compaction) test to determine the maximum dry density of the packing. [0003] At present, on-site railway construction and...

AI Technical Summary

Problems solved by technology

[0010] At present, the vibratory compaction instruments on the market are surface vibratory compaction or vibration forming instruments, which are generally aimed at inorganic binders (asphalt and other pavement materials) on highway pavements. The vibration compaction parameters are static pressure 1900N, exciting force 6800N-6900N, vibration The frequency is 20-30HZ; however, how to set these parameters to obtain accurate test results, there is no mature indoor vibration compaction test plan

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