The Shear Results Of Bsm Alone

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For comparison, the shear results of BSM alone, which are influenced by F-T cycles are presented. Figures 3-13, 3-14 and 3-15 present shear stress-shear displacement curves of samples subjected to different numbers of F-T cycles and sheared at 150kPa, 250kPa and 350kPa vertical loads, respectively. If analysis the curves in Figures 3-6, 3-7 and Figures 3-13 to 3-15, it can be reveal that the shape of BSM sample sheared alone also have similar shape of shear stress-strain curves irrespective of the numbers of F-T cycles. Regardless the applied normal stresses, the highest stresses are all provided by the un-thermal treated samples, and the shear strengths start to drop when the samples were subjected to increasing number of F-T cycles.
From Figure 3-13 to 3-15, it can be observed that the total influences of F-T cycles are decreasing with the increasing vertical load. These changes are similar to the BSM/geomembrane interface results. For instance, under 150 kPa normal stress, the shear strength of samples subjected to 0, 1, 2, 3, 5 and 10 F-T cycles are 134 kPa, 131kPa, kPa, 125kPa, 123kPa and 113 kPa, respectively. The total change of shear strength from un-treated BSM samples to 10 F-T cycles treated samples is 15.7%. When the samples were tested under 250kPa and 350kPa, the total differences drop to 7.3% and 7%, respectively. In these Figures, pre-shear phenomenon can be observed in some curves. This may be caused by the deformation and wearing of the shear boxes’ screw

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