It has become an inevitable trend of human development to seek resources from the deep
underground. However, rock encountered in deep underground engineering is usually in an …

Shale gas, although unconventional, is a prospective clean energy source. Shale gas
production is a complex multi-scale process with its spatial size ranging from the nanoscale …

After the excavation of deep underground engineering, the complex 3D high-stress
redistribution occurs in the surrounding rock, resulting in deterioration of mechanical …

Full understanding of the compression and permeability behaviors of weakly anisotropic
sandstones is a major challenge. The present work aims to address this challenging task …

To explore the mechanism of frequency on the evolution of deformation parameters, triaxial
compression tests under multi-level loading were carried out at different frequencies. The …

Unconventional natural gas, including coalbed methane and shale gas, has become
important natural gas resources. Coal and shale reservoirs are characterised by low porosity …

This paper provides a comprehensive review on the application of proppants to maintain
fracture permeability over the lifetime of a well based on published observations from …

The safe and efficient operation of coal mines is inseparable from rational production
deployment. As for outburst-prone coal mines, the production deployment is more …

The permeability of shale in unconventional subsurface reservoirs under high-temperature
and high effective stress conditions is of great significance for evaluating the extraction …

During the exploitation of deep resources, rock masses are under three-dimensional
anisotropic stress conditions owing to tectonic conditions and engineering disturbances …