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• <br />I <br />TABLE 4 <br />ELASTIC MODULUS AND POISSON'S RATIO TEST RESULTS <br />•\ <br /> <br /> Elastic Modulus2 <br /> Number Tangent Modulus Secant Modulus Poisson's Ratio2 <br /> of Mean S3 Mean S3 Tangent Ratio Secant Ratio <br />Rock Type Sample (106 psi) (106 psi) (106 psi) (106 psi) Mean S3 Mean S3 <br />Floor Sandstone 5 2.713 0.205 1.866 0.186 0.164 0.021 0.113 0.019 <br />Main Loal 5 0.401 0.171 0.298 0.145 0.253 0.046 0.192 0.031 <br />Top Coal 2 0.251 0.026 0.167 0.018 0.3704 ----- 0.348 0.194 <br />Immediate Roof <br />Silts tone 5 3.466 0.542 2.959 0.614 0.111 0.085 0.150 0.069 <br />Roof Sandstone ql 3 3.214 0.823 2.751 0.348 0.095 0.042 0.086 0.044 <br />Roof Sandstone N2 0 ----- ----- ----- ----- ----- ----- ----- _____ <br />Roof Sandstone N3 1 3.639 ----- 3.026 ----- 0.125 ----- 0.104 ----- <br />Roof Sandstone H4 1 2.663 ----- 2.546 ----- 0.100 ----- 0.103 ----- <br />Roof Sandstone p5 2 3.856 0.907 3.065 0.387 0.148 0.038 0.118 0.018 <br />Roof Silts tone 1 4.111 ----- 2.332 ----- 0.104 ----- 0.092 ----- <br />Not_es <br />1. See Figure 3 for locations of these rock types. Lithologic descriptions of <br /> rock types are presented in Table 5. <br />2. Modulus and ratio values calculated at 50% of the ultimate unconfined compressive strength. <br />3. Standard Deviation <br />4. One test only. <br />5. Conversion factor: <br /> 1 psi = 6.8948 x 10 -' MPa <br />