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通过振动三轴试验,研究干湿循环过程对水泥改良粉质粘土和水泥改良粉土疲劳强度的影响。结果表明:在动应力作用下,两种改良土的破坏均为脆性破坏;干湿循环次数对水泥改良土疲劳强度的影响与土类有关,而改良粉质粘土疲劳强度经1次干湿循环后,趋于稳定,而改良粉土疲劳强度经2次干湿循环后才趋于稳定;稳定后的疲劳强度大约下降为静强度的38%左右。水泥改良土的破坏塑性应变随干湿循环次数增加有所增加,但是不超过2%。
Through the vibration triaxial test, the influence of the wetting and drying process on the fatigue strength of cement-modified silty clay and cement-modified silt was studied. The results show that under the action of dynamic stress, the failure of the two kinds of modified soil are both brittle failure. The influence of the number of wetting and drying cycles on the fatigue strength of the cement-modified soil is related to the soil type. However, the fatigue strength of the modified silty clay after one- After that, the fatigue strength of modified silt tends to be stable after 2 times of wet-dry cycles, and the fatigue strength after stabilization is about 38% of the static strength. The damage plastic strain of cement-modified soil increases with the number of wet-dry cycles, but it does not exceed 2%.