In this paper

mineral composition

physico-mechanical properties

physico-chemical parameters

cement materials and microstructure of three typical mudstones from Shigu coal mine in Guangdong province measured are analysed in this paper

and from the point of view of physico-chemistry and mechanics

the effect of water quality change

loss of water content and microstructureal damage on swelling of mudstone is investigated

The result indicates that the clay mineral of mudstone mainly consists of kaolinite and elite

its swelling pressure is 2~5kg/cm2 and induced swelling pressure and the effect of swelling capacity on physico-chemical and mechanical factors are attributable to high clay content

fine clay aggregate

poor crystal

rarely cement materials and dense microstructure.