Uneven displacement of permafrost has become a major concern in cold regions, particularly under repeated freezing-thawing cycles. This issue poses a significant geohazard, jeopardizing the safety of transportation infrastructure. Statistical analyses of thermal penetration suggest that the problem is likely to intensify as water erosion expands, with increasing occurrences of uneven displacement. To tackle the challenges related to mechanical behavior under cyclic loading, the New Geocell Soil System has been implemented to mitigate hydrothermal effects. Assessment results indicate that the New Geocell Soil System is stable and effective, offering advantages in controlling weak zones on connecting slopes and reducing uneven solar radiation. Consequently, the New Geocell Soil System provides valuable insights into the quality of embankments and ensures operational safety by maintaining displacement at an even level below 1.0 mm. The thermal gradient is positive, with displacement below 6 degrees C/m, serving as a framework for understanding the stability of the subgrade. This system also enhances stress and release the sealing phenomenon.

Fault rupture propagation through near-surface soil deposits and the anticipated damage on adjacent structures have been thoroughly investigated focusing on single fault rupture. Nevertheless, large secondary faults have also been observed in field investigations. For this reason, the development of contemporaneous fault ruptures -and the resulting soil displacements-caused by complex combinations of oblique-slip main and non-parallel secondary faults is investigated herein. Moreover, the response of buried steel pipelines crossing such geohazardous areas is also examined aiming to assess pipeline vulnerability due to the presence of secondary faults. The investigation is conducted utilizing a decoupled numerical methodology, in which soil displacements are calculated utilizing a 3D numerical model, and subsequently, they are applied to a separate numerical model for the assessment of pipeline distress. Useful conclusions are drawn regarding the developed fault rupture patterns and the sequent pipeline distress under such detrimental conditions that may occur in seismotectonic regions.