Railway Subgrade Compaction Quality Detection Technology And Performance Testing And Analysis

ABSTRACT:With the emergence of high-speed railway, railway development has entered a new era. As the foundation of the railway, embankment projects are also developing visibly. There are a variety of methods for quality testing in the railway embankment nowadays. How to choose the appropriate detection method, what the difference and relationships between these methods are have become issues of concern and urgent problems.This paper is supported by the sub-project "Detection and Strengthen the Technical Test Embankment" of the National High Technology Research and Development Program (863) project "Heavy Haul Railway Bridge and Embankment Detection and Enhanced Technology Research (2009AA11Z101)". First, railway embankment detection methods were summarized and analyzed. Second, the indicator data are obtained under different conditions of compaction factors through large model tests, such as the tests on foundation coefficient K30, dynamic deformation modulus Evd, static deformation modulus Ev2, light dynamic penetration and shear strength Index based on the backfill compaction factors0.84、0.88、0.94、0.98. The relationships between the compaction coefficient K and each index data are then analyzed. At the same time, with the introduction of the Cambridge constitutive model, based on the above Ev2experimental results, drawing unearthed compression and rebound curve in e-lnp coordinate system, the parameter λ value model and κ value in Cambridge model are found by mathematic curve fitting. The reasons for the changes are then analyzed under different compaction factor, λ value, κ values and values coming from shear strength tests.