Underground Systems (United States)

Deterioration mechanisms under combined low-amplitude thermal-fatigue and sulphate attack of concrete lining materials for underground thermal energy storage

Underground thermal energy storage (UTES) is an emerging decarbonisation technology for storing heat. However, the complex working environment with fluctuating temperature and potentially varying water chemistry may pose challenges to the lining materials, threatening the stabili...

Stirring-assisted CO2 mineralization of a ternary solid-waste backfill material: Effects of temperature and CO2 pressure on carbon sequestration capacity and performance

The synergistic integration of coal mine backfill mining and CO 2 mineralization storage provides a new technical pathway for the resource utilization of bulk industrial solid wastes, stability control of mined-out voids, and long-term CO 2 fixation. In this study, a ternary soli...

A multi-angle and polarization-based retrieval algorithm for aerosol layer height of smoke and dust

The vertical distribution of aerosols in the atmosphere governs their interactions with solar radiation and cloud processes, and is therefore a key factor influencing their climatic and environmental effects. Existing passive remote sensing methods for retrieving aerosol layer he...

Numerical study on instability of rock structural planes induced by stress disturbances

<title>Abstract</title> The activities in deep underground engineering may induce variations in the stress state of the rock, increasing the risk of engineering disasters. The decrease in normal stress <italic>σ</italic>_n and the increase in shear stress <italic>τ</ita...

Paleozoic Tectonic Transition from Arc–Continent Collision to Post-Orogenic Extension in the East Kunlun Orogen: Constraints from Metamorphic Events

Abstract The tectonic evolution of the trench–arc–back-–arc basin system—encompassing back-arc spreading, subduction, basin closure, and the subsequent transition from arc–continent collision to post-collisional extension—represents a fundamental process in the evolution of the P...