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                          Experimental study on triaxial shear characteristics of compacted loess
                                             under drying and wetting cycles

                                               1               1             2         3
                                  HAO Yanzhou ,WANG Tiehang ,WANG Zhao ,JIN Xin
                          (1. School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an  710055,China;
                         2. School of Resources Engineering,Xi’an University of Architecture and Technology,Xi’an  710055,China;
                          3. School of Civil and Architectural Engineering,Xi’an Technological University,Xi’an  710021,China)


                   Abstract: A series of drying and wetting cycles test and triaxial shear test were carried out for the loess
                                                               3
                   samples which were compacted to dry density of 1.7g/cm under the optimum moisture content condition to
                   investigate the influence of the structure damage of the compacted loess caused by the drying and wetting
                   cycles on its stress-strain characteristics and triaxial shear strength. The results indicate that the drying and
                   wetting cycles have a significant effect on the triaxial shear properties of compacted loess,with the number
                   of drying and wetting cycles increasing, the stress-strain curve of compacted loess moves down sharply,
                   then up gradually, and finally tends to be stable. The drying and wetting cycles degrade the triaxial shear
                   strength of compacted loess. The defined strength index degradation degree can better reflect the degrada⁃
                   tion rule and process of the triaxial shear strength index. Affected by the range of dry and wet cycles,
                   there is the worst moisture content of drying and wetting cycles in compacted loess. The degradation degree
                   of strength index is the largest under the condition of the worst moisture content. The degradation degree of
                   triaxial shear strength can be evaluated according to whether the instantaneous moisture content of loess af⁃
                   ter compaction is close to or equal to the worst moisture content.
                   Keywords:drying and wetting cycles;compacted loess;stress-strain curve;critical number;deterioration;
                   the worst moisture content

                                                                                   (责任编辑:韩         昆)







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