Construction Technology of Large Thickness Vibratory Compaction of Hard Rock Embankment

Abstract

In order to provide technical guidance for the construction of rock embankment with a thickness greater than 60 cm, thehigh-power roller with self-weight of 32tand supporting construction machinery have been used to carryoutfield experimentson vibration compaction of large thickness rock embankment, and several indexes of compaction quality have been comparedand evaluated, so the quality detection method and evaluation criteria of large thickness vibration compaction of rockembankment have beenobtained.The results showsthatforthe vibration compaction of the hard rock embankment with large thickness, the effective rolling thickness of the high-power vibratory roller with 32tweight is 90cm.It is suggested that the comprehensive parameters such as loosenesscoefficient, settlement difference and construction technology should be adopted toevaluatingcompaction quality. The standard of compacting quality is: the loosenesscoefficient should be greater than 1.16, the average settlement difference of the last rolling should not exceed 5mm, and the high-power roller should roll more than 6 times.

Utilization of Coal Gangue Aggregate for Railway Roadbed Construction in Practice

“…This study used the K 30 parameter to evaluate compactness, which is under the Standard TB 10414-2018 [29]. K 30 is a conventional and more reliable value for controlling the compaction quality in bridges [21] and in the railway subgrade [48]. At the job site operation, the K 30 measurement conformed to Chinese Standard [25], and the parameters were obtained by Static Plate Load (SPL) tests [21].…”

“…After being calculated by Equation (7), K30 of this roadbed was 162.9 MPa/m. Chen et al [48] reported that K30 data should be more than 130 MPa/m for gravel backfills in high-speed railway subgrades. Typically, a high-speed railway has more stringent specifications than the railway subgrade.…”