Abstract

In order to investigate the influence of water vapor pressure of surrounding environment on fracture toughness of Mode I and II of rock, a series of semi-circular bend (SCB) test under circum-stance with various water vapor pressures were performed. The water vapor is most effective agent which promotes stress corrosion of rock. The rock used in the test was Kumamoto andesite, and the region of water vapor pressure was 10−2 to 103 Pa. It is made clear that elastic modulus and fracture toughness for both modes are dependent on water vapor pressure of surrounding environment and that these relations can be linear logarithmically.

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