Heat Extraction from Hot,Dry Rock Masses.

摘要

In analytical studies of three dimensional crack growth and shape,crack orientation was studied and the condition of a circular crack has been relaxed; a method is under study to determine the crack shape when the pressure of fluid in the crack is prescribed. The growth and stability of parallel,thermally induced edge cracks was investigated as a function of a thermal wave progressing from a free surface,both analytically and by finite element numerical techniques. The geometrical theory of diffraction in three-dimensional elastodynamics was applied to the problem of diffraction by a large crack of a signal emanating from a point source. Fluid flow paths were calculated for flow within two dimensional elliptical cracks with line source near one end and a line sink near the other end.