• Low permeability would limit the long-term gas recovery rates of clayey reservoirs.

• Reservoirs without slope angle show the highest gas production and seabed settlement.

• There is a risk of potential damage of the production wellbore during long-term gas production.

• The diffusion law of smoke was studied. Without ventilation, smoke is effectively blocked by the smoke exhaust cross section and controlled within 2–3 smoke prevention intervals.

• The aims of this work are to study the smoke exhaust effect, compare the smoke exhaust effects of different ventilation air volumes and fan operation modes, and summarize the best smoke exhaust plan.

• ISW generates forces and shear on the seafloor and thus affects sediment suspension in the deep bottom boundary layer.

• This study provides a new perspective for an in-depth understanding of the interaction between ISW and the seafloor.

• An interdisciplinary intersection framework for urban underground space research has been proposed.

• The challenges and trends of research on urban underground space have been summarized.

• The evolution of urban underground space research in different literature databases has been profiled.

• The research results serve as a blueprint showcasing the development of research on urban underground space on a global scale.

• The results indicate that the combined support mode of 4D roof support and conventional side support is highly applicable for the stability control of surrounding rock of deep roadways with a burial depth exceeding 520 m, in that it can effectively restrain the area and depth of plastic deformation of surrounding rock.

• Moreover, 4D anchor cable support limits the accumulation range and rate of elastic strain energy, which is more conducive to the long-term stability control of roadway surrounding rock than conventional support.

• 4D support can effectively reduce the convergence deformation of roadway surrounding rock, and maintain stability for a long time, thus meeting the requirements of safety in coal mining sites.

• Dynamic demands for hydrogen energy were considered as key influencing factors.

• The significance of each index in the site evaluation method for underground hydrogen storage in salt mines was investigated.

• The Pingdingshan salt mine was identified as a suitable location for underground hydrogen storage in China.

• The reliability and accuracy of the numerical model were verified against experimental data measured from a self-built waveflow flume.

• Computational and experimental investigations were conducted on the local scour development and characteristics of submarine pipelines in the Yellow River Delta silty sandy seabed. The effects of different water depths, flow velocities, and pipeline suspension heights on the local scour characteristics of submarine pipelines were compared and analyzed.

• The spatiotemporal extension of mines was conceptualized to mirror the mining-related economic and political realities in China.

• The surface roughness index Z₂ in the axial and radial directions of the Brazilian splitting sample was calculated.

• Prediction models of dynamic splitting parameters based on Z₂2^r are proposed.

• Studies on their industrial applications have not been done earlier.

• This paper provides information on the huge resource of high-grade limemud in the Indian offshore and their suitability for various industrial applications.

• Based on the conventional triaxial instrument, the first generation of the TFD-2000/D triaxial instrument was developed, which can apply disturbing load independently, implementing the function of cyclic disturbance and combined dynamic and static disturbances.

• The second generation of the TFD-2000/D triaxial instrument is improved to achieve variable amplitude cyclic loading, low-frequency high-level ground stress loading, and cyclic dynamic disturbance alternating with creep.

• The drawbacks of the available research works on earthquake triggering are pointed out.

• Some suggestions on scientific issues of earthquake triggering for future research are proposed.

• Based on Beijing Metro Line 19, an engineering discrete element method simulation model of shield tunneling in sandy–pebble stratum was established to study the cutters’ wear combined with engineering observations, and the rationality of the uniform wear design method was verified by comparing with the original engineering scheme.

• The long-distance shield driving was predicted by the Japanese Tunnelling Society model, and the calculation result of the uniform wear scheme was 47% higher than that of the engineering scheme, which showed the superiority of the uniform wear design method.

• Rheological properties, chemical compositions, microstructure characteristics, and mechanical properties of CUC grouts are presented.

• The new high-efficiency CUC grouts are used to reinforce the broken surrounding rock and to confirm that grouting can effectively reinforce the surrounding rock.