Laserfiche WebLink
W/d:(2)E1-E5:1080 /400 2.70 B26-29:1080 /600 1.80 <br />1080 /1425 0.76 1080 /1500 0.72 <br />E6-E8, E14-E17:1080 /360 3.00 <br />1080 /1200 0.90 <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />Max <br />Min <br />(1) <br />(2) <br />(3) <br />(4) <br />(5) <br />(6) <br />(7) <br />(8) <br />(9) <br />TABLE 2 <br />MAXIMUM SUBSIDENCE PARAMETERS FOR <br />SOUTHERN PANELS MINING AREA(1) <br />Maximum crack depth (in feet) in bedrock predicted to locally occur on or near steep slopes and ledges in the Minnesota Creek and Lick <br />Creek drainage areas and above barrier pillars and rigid chain (gate road) pillars. The first depth range (1) is for bedrock sloping less than, <br />or equal to, 30 percent; the second depth range (2) is for slopes more than 30 percent. Add 5 to 15 feet where thick, brittle sandstones occur <br />in ridges and near cliffs. No cracks are predicted to occur in alluvium. No cracks are predicted to occur at the surface of colluvium thicker <br />than about 10 feet. <br />5°5° <br />14°14°14°14°14°14° <br />15 10 15 10 15 <br />5°5°5°5° <br />10 <br />-Em (in terms of Sm/d) (7) <br />(-1.2 to -1.5 Sm/d) <br />Maximum Crack Depth <br />(8) <br />1 <br />2 25 35 25 <br />0.0860.046 0.072 0.028 0.043 0.055Mm (2.2 to 2.3 Sm/d) (6) <br />Em (in terms of Sm/d) (7) <br />(1.2 to 1.4 Sm/d) <br />0.0130.008 0.0160.0100.012 <br />-0.030 <br />-0.007 <br />-0.047 -0.018 <br />Sm = a • t (4) <br />8.45.4 <br />-- <br />0.020 0.031 0.012 0.019 0.032 0.050 <br />0.6 0.6 0.6 0.6 --(a = Sm/t) <br />Sm/d (5) <br />0.004 0.006 <br />0.80.8 <br />0.0110.0070.006 <br />t = 9 ft <br />-- <br />7.2 11.2 7.2 11.2 14.4 22.4 <br />0.1 0.1 0.1 0.1 -- <br />-- <br />-- <br />-- <br />-- <br />t = 14 ft <br />2.7 4.2 2.7 4.2 ---- <br />Parameter Panels E1 - E8, E14 - E17 (t = 9 to 14 ft)Panels B26 - B29 (t = 9 to 14 ft)Sum of E & B Panels <br />Max <br />Min <br />Min <br />Max <br />t = 9 ft t = 14 ft t = 9 ft t = 14 ft <br />Scp = acp • t (3) <br />(acp=Scp/t) <br />0.9 <br />0.3 <br />1.4 <br />0.3 <br />0.9 <br />0.3 0.3 <br />1.4 <br />Break Angle (9) <br />Angle of Draw (9)19°19°19°19°19°19° <br />0°0°0°0°0°0° <br />-0.028 <br />-0.004 -0.007 <br />-0.048 -0.075 <br />-0.009 -0.014 <br />352535 <br />5 5 555 5 <br />-0.005 <br />10 15 10 15 10 15 <br />0.004 <br />-- <br />16.8 <br />-- <br />10.8 <br />0.8 <br />8.4 <br />0.8 <br />5.4 <br />Maximum range of tilt in terms of Sm/d; values of 2.2 to 2.3 Sm/d are obtained from the graph in Figure 5. <br />Maximum range of horizontal strain in terms of Sm/d; values for tensile (positive) strain of 1.2 to 1.4 Sm/d and compressive (negative) strain <br />of -1.2 to -1.5 Sm/d are obtained from the graph in Figure 5. <br />Angle measured from a vertical reference. <br />E-Seam Mining B-Seam Mining Sum of E and B-Seam <br />Mining <br />0.070 <br />0.009 0.014 <br />Maximum tilt and strain parameters apply only to ground surfaces with slopes less that 30 percent; values may be greater on slopes steeper <br />than 30 percent. <br />All panels are numbered according to planned panel identifications. <br />Subsidence and subsidence factor above chain pillars. <br />Subsidence (maximum vertical displacement) above longwall panel centers, based on planned coal extraction thickness listed. <br />Ratio of the range of maximum vertical displacement to overburden depth range for the longwall panels. <br />0.028 0.044 <br />0.005 0.007 <br />0.017 0.026 <br />0.004 0.007 <br />0.045 <br />0.008 <br />G:\WWE\831-032\923\Engr\Exhibit 60E\Tables\ <br />Table 2 Southern Panels.xlsx <br />Wright Water Engineers, Inc. <br />December 15, 2021 <br />Calc By: MO <br />Chkd By: JMK