This paper presents recent advancement in and applications of TOUGH-FLAC, a simulator
for multiphase fluid flow and geomechanics. The TOUGH-FLAC simulator links the TOUGH …

Coal and gas outburst is a violent mechanical instability of gas-containing coal, and its
mechanism is crucial for prevention of gas dynamic disasters. The macroscopic instability of …

Efficiently and accurately understanding the fluid flow behavior in ultra-deep natural gas
reservoirs is very challenging due to the complex geological environment and the intricate …

We have developed a new coal-permeability model for uniaxial strain and constant
confining-stress conditions. The model is unique in that it explicitly considers fracture–matrix …

As the effective stress increases, low-permeability rock undergoes fairly small porosity
changes, but significant decrease in the permeability. Empirical relationships based on …

Gas diffusion, a critical process during underground gas drainage and coalbed methane
recovery, is viewed as the bridge connecting the coal matrix and fractures. Study on gas …

During hydrostatic compression conducted within the elastic regime, P and S‐wave
velocities measured on porous rock samples generally increase with pressure and reach …

Natural rock, such as sandstone, has a large number of discontinuous, multi-scale, geometry-
irregular pores, forming a complex porous structure. This porous structure essentially …

A series of coal permeability experiments was conducted for coal samples infiltrated both
with non-adsorbing and adsorbing gases–all under conditions of constant pressure …

Uncontrolled and excessive gas emission may affect normal production and even result in
serious disasters such as gas explosion and coal and gas outburst. To find out the essence …