干湿循环条件下膨胀土裂隙特征分形研究
FRACTAL RESEARCH THE CRACK CHARACTERISTIC EXPANSIVE SOIL UNDER WETTING-DRYING CYCLE
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摘要: 通过膨胀土多次干湿循环的三轴和直剪实验,从试样裂隙率计算结果可以得出,三轴试样,经第1次循环,其表面裂隙率增幅最大, 2~4次循环增幅较大,第5次循环增幅较小。直剪试样,试样表面裂隙率经1~3次循环增幅较大,第4次循环增幅较小,第5次循环以后试样表面裂隙率有所降低,但降低的幅度不大。总的说来,随干湿循环次数的不断增加,膨胀土试样表面裂隙率不断增大。Abstract: By means of the wetting-drying cycle tests of triaxial and direct-shear on the expansive soil.The test finds that with first wetting-drying cycle triaxial test,the crack ratio in expansive soil sample surface is the largest increase,with second to fourth wetting-drying cycle,the crack ratio in expansive soil sample surface is the bigger increase.And the crack ratio in expansive soil sample surface is the little increase,with the wetting-drying cycle is more than five.And the same result is finds in the direct-shear test.All in all,With the number of times wetting-drying cycle increasingly,the crack ratio in expansive soil sample surface is constantly increasing.
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