Through linear sandpack model and transparent micromodel experiment,this paper studies migration rules of weak gel in porous media and general characteristics of EOR.

Gas migration law of coal mining in seam with short distance to protection seam;

Studying the self migration law of Rn and its daughters is one of basic theoretical subjects.

The self?migration law of Rn has been systematically studied in lab whose condition is ideal.

In this paper, compositive research techniques including of three-dimensional numerical simulation, in-situ measurement, equivalent material simulation and theoretical analysis are carried out to investigate the stress distribution, failure mechanism and displacement and movement laws of top-coal and roof in fully mechanized top-coal caving (FMTC) face with thinner-thick seam.

8 coal seams in Xieqiao Coal Mine, comprehensive research methods combining theoretical analysis、three-dimensional numerical simulation and in-situ measurement are carried out to investigate the distribution of the complicated stress and displacement field, failure mechanism, displacement and movement laws and the interaction influence between upper /lower coal seams.