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-5- <br /> <br />which can affect the solution. These forces are ignored in the analysis to <br />make the solution determinate: Including these forces requires an interative <br />analysis procedure be used since there are more unkowns than equations. These <br />types of analytical procedures are commonly called "accurate" techniques. <br />The Spencer's method is an "accurate" technique which includes allowances for <br />interslice forces and requires a complete equilibrium condition satisfying <br />both summation of moments and forces. The difference in solutions between <br />the "accurate" techniques and the "approximate" techniques were found to be <br />small for the conditions analyzed. Generally, safety factors will vary only <br />10 to 15 percent. The approximate techniques tend to generate more conserva- <br />tive solutions. <br />• The Spencer's method of analysis was conducted using the computer program <br />SSTAB-1 developed by Stephen Wright at the University of Texas. The Swedish <br />analysis method used the graphical solution technique. The Bishop method was <br />done with a method of slices using a fine slice width and was accomplished with <br />the use of a computer code. Sliding block analysis is accomplished by a simple <br />summation of static forces. The references contain more detailed information <br />on analysis techniques and procedures. <br />RESULTS OF ANALYSES <br />Analyses were conducted using six strength conditions, and five water <br />table conditions. Our analyses reflect three general classifications of failure. <br />The primary emphasis was placed upon deep-seated failures involving large <br />amounts of material. Analyses were also conducted for very shallow failure <br />n <br />U <br />