A Comparative Analysis of the Elastic Modulus of the Ballast Prism When Using Volumetric Compaction Technologies and Traditional Methods of Track Straightening in Medium-Scale Railway Track Repair Conditions

Purpose: To determine the elasticity modulus of the ballast prism and its unevenness in sections straightened by the method of volumetric ballast compaction, using a string of continuous-action track machines (CTM-C and PSM), and the ballast prism levelled with the standard technology, using continuous and continuous-cyclic machines (CTM-C + Dynamic 09-3X), in a full cycle of standard track repair (TR). Methods: The measurements were obtained with the sleeper box removed to the bottom of the sleepers. The PDU-MG4.01 ‘Udar’ dynamic soil density meter was employed for this purpose, and the most suitable location for stamp installation was selected. A total of seven measurements were obtained for each cross-section of the ballast prism. Results: It has been determined that the modulus of elasticity of the track ballast prism by the method of volumetric compaction repaired as part of level-3 track overhaul and straightened by a single pass of continuous-action machines CTM-C and PSM complex, is not lower than that of the track ballast prism of sections straightened by a single pass of the Dynamic 09-3X continuous-cyclic machine performing standard double-triple piling of sleepers. The technology under discussion provides the required parameters of ballast prism track stabilization without the need for additional DSM dynamic stabilization machines. Following the implementation of the technology in question, it is anticipated that the condition of the track will permit the movement of trains at design speeds. Furthermore, it is expected that the implementation will provide throughput capacity for the section. Practical significance: The following amendments have been made to the regulatory documentation in order to establish a regulatory framework that accounts for the elasticity and deformation modulus of the ballast prism during track repair work performed by various machines. The framework must include provisions for the volumetric compaction of the ballast prism, the state of compaction, modulus of elasticity and modulus of deformation of the ballast prism and the main subgrade area, and so forth. In the course of further research, it will be necessary to develop track-straightening technologies that preserve the elastic and draining properties of crushed stone ballast and increase the life cycle of the track superstructure.