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/uru 1992 TCC • Prediction oJSubsidence EJferv ~ s • Maximum transverse horizontal displacements of +8 and -4 inches after Panel 3 extraction • Maximum stnins of +.003 and -.005 aher Panel 3 extnction. Maximum compression zones located over Panel 1 and Panel 2 centerlines. Maximum extension zones located over Panel 1 and Panel 2 ribs • A transverse draw angle of 15 to 20 degrees 3.2 START PROFILES 3.2.1 Start Profile for Panel 1 -Survey Llne 6LCL The results of [he analysis for Survey Line 6LCL are shown in Tables 6 to 8 and Figures 8 to 10. Inspection of Figure 8 (and Table 6) indicates a maximum subsidence of 44 inches due to Panel 1 extraction increasing to 53 inches for Panel 2 and 57 inches for Panel 3 eatrattions. Other key data obtained from an inspecion of Tables 6 to 8 and Figures 8 to 10 includes: • Maximum horizontal displacement of 6 inches • Maximum strains of +.003 and -.002. Maximum extension zone logted over the start room. Maximum compression looted within a zone approaimately 200 to • 500 feet from the star room • A star profile draw angle of approximately 15 degrees 3.2.2 Start Profile for Panel 3 -Survey Line 4LCL The results o{ the analysis for Survey Line 4LCL aze shown in Table 9 and Figures I1 to 13. Inspettion of Figure 11 (and Table 9) indiates a maximum subsidence of 52 inches. Other key data obtained from an inspettion of Table 9 and Figures 11 to 13 includes: • Incomplete subsidence beyond 800 feet from [he Panel 3 non room is assoaated with limited face advance. • The start profile can be accurately predicted using the s[an profile function from the Subsidence Engineer's Handbook, Figure 32, and the actual, measured maximum subsidence • Maximum horizontal displacement of 6 inches • Maximum strains of +,003 and -.002. Maximum extension zone located over the star room • A scan profile draw angle of IS [0 20 degrees ACL lnc. * P.O. Box 77f018 • Srmmbwt Springs, Coiorado 80177 • (303J879~6160