Experimental studies relating mineralogical and petrographic features to the thermal piercing of rocks / by James A. Soles and Lorant B. Geller. : M34-20/53E-PDF

“The mineralogical relations, petrographic features and certain other physical properties of several classical rock types are compared with the results of laboratory scale jet-flame piercing tests on large samples of the rocks. The comparison has provided information which may be used to assess the potential usefulness of jet-flame rock drills in areas where the geology is known. The compressive strength and specific heat of a rock cannot be used to predict its pierceability by a jet flame. Linear thermal expansion is an unreliable indicator of a rock's pierceability. Textural, structural and, particularly, mineralogical information, however, can be used to predict how a rock will respond to thermal shock. The rocks examined and their respective piercing characteristics are described. Quartz, nepheline and dolomite favour the spalling process; thus, rocks of the granite, quartz-rich metamorphic, nepheline syenite and dolostone classes should be pierced easily. Micas and mafic minerals tend to reduce the efficiency of the spalling process. Certain textural relationships of minerals, such as graphic intergrowth, may favour disintegration of a rock. Structural weaknesses, soft materials, and schistosity in rocks retard the piercing process"--Synopsis, p. i.

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