Abstract
Thermal fracturing of hard crystalline in situ rock has been studied by solving the quasistatic uncoupled thermoelastic equations for a semi-infinite medium subjected to transient surface heating over a circular area by a constant flux or constant temperature convective heat source. The thermoelastic stress state is related to brittle fracture in rock according to an appropriate form of the Griffith and the modified Griffith theories. The predicted zone of weakening has been experimentally investigated by lasing samples of Barre granite. Measurements of the size of the in-depth fractures correlated well with the predicted results.
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