Unconventional natural gas extraction has undergone rapid progress in recent years as an emerging energy source, and the amount of methane gas stored in gas hydrates is estimated to be larger than that of all other natural gas resources combined. In the process of finding suitable hydrate reservoirs for possible exploitation and other applications, it is vital to understand the effect of reservoir conditions on the formation kinetics of methane gas hydrates. The aim of this study is to investigate hydrate formation characteristics in a porous medium under different confining conditions, focusing on the effect of confining pressure on hydrate nucleation, growth, and saturation. A series of experiments was performed to simulate in-situ hydrate reservoir conditions in a custom-designed reactor to synthesise methane hydrates in a porous quartz sand medium under different confining and formation pressures. Temporal changes in gas pressure and temperature were incorporated to quantify the co
Numerical modelling has been widely used in the underground excavation design, where the in situ stress state plays a crucial role in the stability analysis. However, determination of an exact stress state for a specific geological region remains uncertain due to the complicated tectonic nature and measurement limitations. The stability is thus better analysed by considering the in situ stress as a finite spectrum and pinpointing the possible worst-case scenario. The most probable scenarios of in situ stress states in the Rožná mine area were analysed based on the varying trends in principal stress ratio and mean stress values obtained from four different measurement/analysis campaigns. The influence of different in situ stress judgement on the deformation and failure characteristics of the Bukov Underground Research Facility (URF) (Phase II, Czech) were investigated by the finite volume program FLAC3D. Results show that the increased horizontal stress anisotropy and the mean stress