PERMFILE111925

• Permit No: M1999002
• IBM Index Class Name: Permit File
• Doc Date: 6/18/1999
• Doc Name: OBJECTORS EXHIBITS
• Media Type: D
• Archive: No

~8 ~ M, L, JEREM(C
ateral limits of the extracted area with its maximum at
he center of the caves.
2. As a result of this displ xemenC, a curvature
~f the ground surface results. The curvature in some
_ases represents Gauss' function, when Che subsidence
reaches a final settlement. The deformaCions of the
ground surface can be described by three zones (1•'ig. 2).
• . First, the zone of maximal vertical displace-
ment (simple uniaxial compression) which should be above
the center of the "general cavern" in the rock salt forma-
tion. This zone of deformation is represented by a sinY.
hole filled in by water. It is located at the middle of
the bowl of surface subsidence and consists of broken rock
material. The profile of subsidence in this zone caused
by solution mining has a convex curvature.
4. The second zone of ground surface deformation
surrounds the sink hole. 'f he slope is repro scnCcd usually
by ~oncave curvature (flu tchinson, Kansas (2); [3arich,
Poland (3)) and it is focmed by vertical and horizontal
ground movements (shear stresses). It is interesting to
note that while the radius of curvature varies, the geo-
metrical shape is always the same.
5. The third zone represents an area of minimal
vertical movement, but Horizontal extensions occur (ten-
Bile stress). The slope of this peripheral part of sub-
sidence could be very gentle, with a larger extension
SUBSIDENCE FROM SOLUTION MINING OF SAL7 2O9
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