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本文通过对泥岩(粉质粘土)所进行的静、动强度试验结果的比较,验证了加荷速率效应和重复效应对泥岩强度的影响。试验发现:在快速加荷(升压时间10ms)的情况下,土的动强度都大于静强度。该泥岩无侧限抗压强度动力值为静力值的2.3-2.9倍;动强度指标C为静强度指标C.的2.8倍左右,它们的ф值相近。重复(3600次)荷载效应对泥岩强度的影响不太明显。在无侧限的条件下,其疲劳强度稍低于静力无侧限抗压强度值。
In this paper, by comparing the static and dynamic strength test results of mudstone (silty clay), the influence of the effect of loading rate and repetition on the strength of mudstone is verified. The experiment found that the dynamic strength of soil is greater than the static strength under the condition of rapid loading (boost time 10ms). The unconstrained compressive strength of mudstone is 2.3-2.9 times the static value; the dynamic strength index C is about 2.8 times of the static strength index C. Their enthalpies are similar. Repeated (3600) load effects have little effect on mudstone strength. Under unconfined conditions, the fatigue strength is slightly lower than the static unconfined compressive strength value.