2026 Volume 21 Issue 2 Pages 219-237
The authors have been investigating the applicability of liquefied stabilized soil (LSS) as a railway embankment material, with the aim of labor-saving and rapid construction of earth structures at narrow sites where compaction using heavy machinery is difficult. This paper reports on the long-term durability of the proposed structure with a protective layer, the strength development characteristics of LSS, and practical methods for setting the design mix strength and evaluating its strength and deformation properties. Long-term monitoring results demonstrated that the protective layer effectively prevents drying and discoloration of the LSS surface. However, due to differences in curing conditions between field and laboratory environments, the target strength was not achieved at 28 days in the field. Therefore, a safety factor of 2.3 was proposed, taking into account the field-to-laboratory strength ratio. Furthermore, results from unconfined and triaxial compression tests indicated that the strength parameters of LSS under service conditions can be assumed as an angle of shear resistance 𝜑 = 0° and the cohesion 𝑐 is constant, allowing cohesion c to be estimated from the unconfined compressive strength 𝑞𝑢.
