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<br /> <br />The triaxial shear tests were utilized in a shear analysis of embankment <br />stability. The Swedish method of slices was applied to the dam cross section. <br />One trial method is reported herein for record purposes and points of discussion. <br />The cross section was divided into nine (9) segments as shown in Sheet 2. <br />The following table illustrates type and magnitudes of forces resolved from <br />the Swedish Circle using a dry density of no pd. <br /> <br />Al <br />A2 <br />A3 <br />A4 <br />AS <br />A6 <br />A7 <br />As <br />A9 <br /> <br />STATION 6 + 25 <br /> <br />ft2 <br />Area <br /> <br />i <br /> <br />Wx <br /> <br />SWEDISH CIRCLE <br /> <br />Sx <br /> <br />3114 <br /> <br />4590 <br /> <br />4299 <br /> <br />3472 <br /> <br />2560 <br /> <br />1191 <br /> <br />-244 <br /> <br />-171 <br /> <br />-272 <br />18539 <br /> <br />Nr <br /> <br />Nr Tan 0 <br /> <br />35 <br /> <br />54 <br /> <br />3450 <br /> <br />2262 <br /> <br />1103 <br /> <br />55.3 <br /> <br />49 <br /> <br />6083 <br /> <br />3990 <br /> <br />1946 <br /> <br />69.9 <br /> <br />34 <br /> <br />7689 <br /> <br />6374 <br /> <br />3108 <br /> <br />74.7 <br /> <br />25 <br /> <br />8217 <br /> <br />7447 <br /> <br />3632 <br /> <br />71. 5 <br /> <br />19 <br /> <br />7865 . <br /> <br />7436 <br /> <br />3626 <br /> <br />62.4 <br /> <br />10 <br /> <br />6864 <br /> <br />6759 <br /> <br />3296 <br /> <br />51.0 <br /> <br />o <br />2 30' <br /> <br />5610 <br /> <br />5610 <br /> <br />2736 <br /> <br />35.8 <br /> <br />2030' <br /> <br />3938 <br /> <br />3937 <br /> <br />1940 <br /> <br />13 <br /> <br />11 <br /> <br />1430 <br /> <br />1429 <br />45244 <br /> <br />696 <br />22063 <br /> <br />The summation of the (Sx) shearing components is l8, 539 on this trial <br />surface. The resistance to this shear or sliding component is furnished by <br />the cohesion and the friction in the soil. TIle cohesion is equal to the unit co- <br />hesion times the total length of the curved surface, or cL. The friction <br />resisting movement is: <br />n <br /> <br />Sx = cL + ~ Nr Tan 0 <br />1 <br /> <br />in which () is the friction angle of the soil mass. The triaxial shear tests <br />gave values of ()l froJU 40. to 320 with an average of ISO. On the spillway end <br />the low value was 26. The unit cohesion was reported as 0 and O. 70 ksf. The <br />zero value is probably not realistic. A minimum c = 10 psf (0.01 ksf) was <br />used herein for analyses. <br /> <br />III-4 <br />