Lots of researches have proved that adsorbed gas-coal can generate swelling deformation and when the swelling deformation is restricted, swelling stress can be produced.

• 摘要己有研究表明，煤吸附瓦斯后要发生相应的膨胀变形，而当这种膨胀变形受到一定的限制时，将会产生膨胀应力。