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Figure 9. Localized Mining Induced Slope Angle Changes <br />A. Normal assumption of flat <br />ground surface <br />Temporary tilting toward face advance <br />B. Longwall face advance in <br />direction of slope inclination <br />Temporary minorflattening of slope <br />A FLAT-LYING GROUND SURFACE SUBSIDENCE PROFILE ~Q' <br />I Sm.. <br />s~. <br />I <br />s <br />I I <br />I "~° <br /> <br />I I <br />-1- <br />---- <br />--- <br />I I <br />I I I PLAN VIEW <br />I Tension <br />I _ <br />A I ~ V/Compression <br />B CANYON FLOOR <br />~s~OQF ~ I <br />O`~~ <br />/ SU~`O~NGE P <br />s' <br />I I <br />I I <br />I ~ <br />I <br />I <br />I I I PLAN VIEW <br />( I Tension <br />I I __ <br />B I I /Compression Br <br />C. Longwall face advance against <br />direction of slope inclination <br />Temporary minor steepening of slope <br />CANYON FLOOR <br />p~g`~j / I <br />/ I <br />I <br />/~ I <br />-_~./ I I <br />I I <br />I i <br />I <br />I <br />_L I <br />PLAN VIEW I I I <br />~ I I <br />Tension I I <br />C Compression\V ~ I r~ <br /> <br />