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3.4 Ruck Quality <br />The in-situ strength and deformation properties of rucks are influenced by nltact strength <br />(timaxial compressive strength) and the condition of geologic discontinuities within the <br />rock mass volume of interest. A number of indices, from simple to sophisticated, have <br />been used by practitioners in ruck engincering to characterize ruck mass quality. A useful <br />parameter commonly used in geomechanics is RQD, which is the sum of all core pieces <br />greater than four inches divided by the total interval length. Table 3 presents a <br />relationship between RQD and rock quality suggested by Decre (1969). Another, more <br />sophisticated index (see section 3.5) is Ruck Mass Rating (Blemawski 1984). <br />1] <br />Figures 10 through 12) present ROD results for TC-03-01, TC-03-02, and TC-03-03, <br />including data statistics. On the average, rocks located near the Terror Creek are <br />classified as "Fair". \Vithin each hole, there are zones of rock classified as -uod to <br />excellent, as \Nell as occasional poor rocks. RQD value, imhroye 0cnerally from TC-01- <br />01 toward the other holes in the con Idor. <br />12 <br />TC-03-01 <br />Avnrano=50°/ <br />is <br />O <br />E <br />0 <br />z <br />4 <br />0 <br />0 10 20 30 40 50 60 70 80 90 100 <br />Rock Quality Designation, % <br />Figure 10. Histogram fi-equcncy diagram for RQD values for TC-01-01. <br />Vlalckl I echnologics, Inc. Page 2 1