熱による岩石の強度の変化あるいは破壊について

抄録

There has been a rapid increase of interest to unconventional methods of fracturing rocks.Particularly, mechanics of thermal fracture, either by the application of direct heat or electrothermal conversion, are most favourable for practice.
In this paper, the authors reported their experiments to measure the strength changes of rocks heated to high temperatures and the thermal fracture.
From the experiments, several fracturing mechanisms of rocks heated to high temperatures were found. Which are;
a) Thermal elastic stresses induced in rock.
b) Transformation of crystal form of the constituting minerals of rock.
c) Decomposition of the constituting minerals.
d) Melting.
e) Thermal expansion of the constituting minerals.
f) Others.
Neverthless these mechanisms are all affecting to thermal fracturing of rock, one of them is a dominant factor to fracture a particular kind of rock by heat, for example b) to granite and c) to limestone.