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}IM TRTUM 8 RSSOCIRTES•• TEL: •=.995 7191 ~ Rp ~~ 1 ~~• 3 ~ 10 No .OOe P .06 Progress Re on Tatum House Bubsldonoe issuer Apti114,1896 Allan Mine Model Pace 6 The Brat stop in the analysis prnceea was to input the Woodward-Ciyde -Allen Mine data into the program. For comparison purposes the PrvSle Function Method was set up as a Room and Pillar model QNgure AM-1), and as a longwall modal (Figure AM•2, then the Iniluenae Function method was modeled transversely. (Figure AM- 8). The mine plan u calculated by the program is ahowa ea Figure AM-4. $ubsidence carvoe are su~erimpoted a, in Figure AM 6 and show a reasonable fit with the Profile Fuactron room and pillar curve. UsiaB the same parameters, a longitudinal model was calculated, Figure AM•6. Notice that it does not match the transverse model ahowittg the different way the surface disturbance is calculated. Neat tho parameters were ac~usted eo tbat the modiSed subsidence curve closely matches a curve drawn with actual field data, taking into account that it does not reflect fall subsidence. This was done by adjuc the ankle of influence, and the edge effect„ which in turn acljusta the subaideaos ihctor. The new mine model is shown as Figure AM-8, sad the eubeideaos curve is shown is Figure AM-9. The key parameter for matching was to develop a significant (measurable) amount of aarfaoe movement 600 ft f n front of the a~iaing face, without making unrealistic changes in the angle of influence. Tha program does not show much sensitivity to changing sabeidenoe lactozs, related to tY,e war burdsn-% hnrdrock, changing the influence angle, or even to cbaaging the width of the ezcavatioa. For the model presented here, loagltudinal prediction point IFl was estimated to be is thR same location as Woodward Clyde surihce survey line retet+enoa point 2-12 and is located about 80 East behind the Seal face location (at that date), prediction point N 618 about 600 feet in front of the t9~ca sad oornsponda to Woodward Clyde point 2.1T. Other models were constructed using the other mine panels, with generally the name results. Elevations and survey line points were measured from the report Figures using a variable scale. The model ie not sensitive to difference in measuremanta due to small dra$iag or sealing errors. The pmgram does not understand negative subeideaoe, but a close match of the cYrrvee can be made. One of the esamples included with the users manual shows a negative subsidence situation.