Installation of Geotextile Material to Prevent Mud Pumping on The Railroad Tracks

Abstract

Mud pumping is a critical geotechnical problem in railroad trackbeds, leading to significant ballast contamination, loss of drainage capacity, and a progressive reduction in track stability and safety. This phenomenon occurs when dynamic train loads, in the presence of water, eject fine-grained subgrade particles upward into the ballast layer. This study investigates the application and installation methodology of geotextile materials as an effective preventative and remedial measure against mud pumping. The geotextile is strategically placed at the interface between the subgrade and the ballast layer to perform two primary, critical functions: separation and filtration. As a separator, it physically prevents the mixing of the fine subgrade soil and the coarse ballast aggregate. As a filter, it allows pore water to pass freely from the subgrade while retaining the soil particles, thus preventing the formation of slurry. This paper analyzes the technical requirements for geotextile selection and details the installation procedures for both new track construction and existing track rehabilitation. The findings confirm that the proper installation of a suitable geotextile effectively mitigates mud pumping, thereby preserving the ballast's structural integrity and drainage function. This application leads to enhanced track modulus, a significant extension of the track's service life, and a substantial reduction in long-term maintenance cycles and operational costs.