水-岩化学作用之岩石断裂力学效应的试验研究

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Abstract The fracture mechanics effects of chemical action of water-rock and their time-dependent and chemical environment-dependent behaviors in grey granite，green granite，grey sandstone and red sandstone are analyzed by test of KIc and COD for rock under different conditions. The fracture mechanics effect of chemical action of water-rock is evident and time-dependent. The big differences exist for the influence of different aqueous solution，different rocks，different immersion ways and different velocity of cycle flow on the fracture mechanics effects of rock. The mechanical effect of water-rock interaction on propagation of fracture is consistent with the mechanical effect on the peak strength of rock. The intensity of the fracture mechanics effect increases with the intensity of chemical action of water-rock. Iron and calcium ion-bearing mineral or cement in rock are some key ion or chemical composition，and especially iron ion-bearing mineral resulting in chemical action of water-rock is provided with both positive and negative mechanical effects on rock.

Key words： aqueous solution fracture mechanics chemical action of rock and water mechanical effects chemical damage

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