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应用土粒按粒级质量分布的细度分维计算方法,根据土粒的机械组成实验分析结果,计算出4种土的细度分维。通过实验发现,在风干养护条件下,粗砂土、细砂土、面砂土、砂壤土掺加派酶的无侧限抗压强度均比不掺的高;在研究范围内(每千克土中派酶掺量0.015~0.045 ml),随着派酶掺量的增加,7d、28d无侧限抗压强度增加趋势的逐渐变缓。依据实验数据,分析7d、28d无侧限抗压强度与土粒质量分布的细度分维和派酶掺量关系的拟合模型;对该模型的三维图的分析表明,土粒的细度分维对派酶固化土7d、28d无侧限抗压强度的影响比派酶掺量更显著;派酶固化土7d、28d无侧限抗压强度随土粒的细度分维的增加(D=2.2466~2.5031),分上升、波动和急剧上升三阶段,总体呈非线性上升趋势。
According to the method of fractal dimension calculation of soil mass by particle size distribution, the fractal dimension of four kinds of soil is calculated based on the experimental results of soil particles’ mechanical composition. The results showed that the unconfined compressive strength of coarse sand, fine sand, fine sand, sandy loam and sandy loam was higher than that of non-adulterated under the condition of air-dry curing. In the range of the study In the amount of dispaly enzyme 0.015 ~ 0.045 ml), with the increase of the amount of dispatching enzyme, 7d, 28d unconfined compressive strength increased gradually decreased. According to the experimental data, the fitting model of the relationship between the unconfined compressive strength at 7d and 28d and the fineness and particle size distribution of the soil mass distribution was analyzed. The analysis of the three-dimensional map of the model showed that the fineness fraction The effect of dimension on the unconfined compressive strength of the cured soil 7d and 28d was more significant than that of the dispaly enzyme. The unconfined compressive strength of the cured soil 7d and 28d increased with the fractal dimension of the soil (D = 2.2466 ~ 2.5031), rising, fluctuating and rising sharply in three phases, showing an overall nonlinear upward trend.