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A critical failure surface searching method, using a random <br />technique for generating CIRCULAR surfaces has been specified. <br />1600 trial surfaces will be generated and analyzed. <br />40 Surfaces initiate from each of 40 points equally spaced <br />along the ground surface between x = 150.0 ft <br />and x = 200.0 ft <br />Each surface terminates between x = 500.0 Et <br />and x = 650.0 ft <br />Unless further limitations were imposed, the minimum elevation <br />at which a surface extends is y = .0 ft <br />* * * * * DEFAULT SEGMENT LENGTH SELECTED BY XSTABL * <br />23.0 ft line segments define each trial failure surface. <br />ANGULAR RESTRICTIONS <br />The first segment of each failure surface will be inclined <br />within the angular range defined by <br />Lower angular limit :_ -45.0 degrees <br />Upper angular limit :_ (slope angle - 5.0) degrees <br />-- WARNING -- WARNING -- WARNING -- WARNING -- (# 48) <br />Negative effective stresses were calculated at the base of a slice. <br />This warning is usually reported for cases where slices have low self <br />weight and a relatively high "c" shear strength parameter. In such <br />cases, this effect can only be eliminated by reducing the "c" value. <br />************************************************************************ <br />------------------------------------------------------------ <br />USER SELECTED option to maintain strength greater than zero <br />------------------------------------------------------------ <br />ERROR # 30 <br />The angle specified as the LOWER angular limit for surface generation <br />is larger than the angle specified as the UPPER limit. This is not <br />correct. Please check the data for a possible reversal of these <br />values before retrying the analysis. <br />