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C~ <br />April 1989 <br />TABLE 3.4.A.10 <br />COMPARISON OF UNIAXIAL COMPRESSIVE <br />STRENGTHS ACCORDING TO ROCK TYPES <br />• <br /> <br /> <br /> Carbonaceous <br />Shale Sandy <br />Shale Sandstone Siltstone Inter- <br />beds <br />F Seam Roof *Avq=4,320 15,620 14 180 9,890 6,300 <br /> 5= N/A 4,060 6,890 7,960 N/A <br /> N= 1 4 6 5 1 <br />F Seam Floor ^ Avq=1,870 12,720 7,196 21,480 <br /> S= 535 2,300 568 8,060 <br /> N= 2 6 3 2 <br />E Seam Roof Avg= 815 6,950 12,870 8,400 3,120 <br /> 5= N/A 4,000 8,055 i 3,240 1 <br /> t1= 1 10 14 6 N/A <br />E Seam Floor Avg=2,870 N/A 13,150 N/A <br /> 5= N/A o,860 <br /> N= 1 3 <br />B Seam Roof Avg=4,550 6,769 11,850 12,170 <br /> S= N/A 4,300 4,580 4,810 <br /> N= 1 9 6 ~ 7 <br />B Seam Floor Avg=2,010 7,090 N/A N/A <br /> 5= N/A 2,700 <br /> N= 1 10 <br />* Avg= Average, psi S= Standard deviation, psi <br />N= Number of tests <br />