Dynamic characteristics of dredged silt-solidified soil subgrade
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摘要: 为实现疏浚淤泥固化土的资源利用，探究其作铁路路基填料的动力特性，以山东泰安大清河河道清淤工程为背景，针对疏浚淤泥固化土开展动三轴试验，分析不同配比下的动应力-动应变关系和阻尼比等特性。结果表明：不同配比试样动应力-动应变关系曲线变化趋势大体一致，双掺粉煤灰比单掺水泥的试样在相同条件下产生更大的剪应变；各配比下试样的阻尼比变化趋势基本一致；阻尼比随着动剪应变的增加先减小再显著增加，最终单掺试样的阻尼比稳定于30%左右，双掺试样稳定于10%~20%；得到土样累积塑性变形随振动次数的拟合对数曲线，并评估得到各试样的累积塑性应变均满足动力稳定需求，能为淤泥固化土用作铁路路基的研究提供一定参考价值。Abstract: To realize the resource utilization of dredged silt-solidified soil and to explore its dynamic characteristics as the railway subgrade fill, the triaxial tests on the dredging project of Daqinghe River in Tai'an, Shandong Province are carried out, and the characteristics of dynamic stress-dynamic strain relationship, dynamic shear modulus and damping ratio under different ratios are analyzed. The results show that the trend of dynamic stress-strain relationship curve under different ratios is generally the same, and the double-mixture fly ash produces greater shear strain than the single cement sample under the same conditions. The change trend of the damping ratio under each ratio is basically the same. The damping ratio first decreases and then significantly increases with the increasing kinetic shear strain. The damping ratio of the final single sample is stable at about 30%, the double-mixture test sample is stable at 10%~20%. The fitted logarithmic curve of the cumulative plastic deformation of soil samples with the vibration number is obtained and evaluated, and it is obtained that the cumulative plastic strain of each sample meets the requirements of dynamic stability. It may provide some reference value for the feasibility of silt-solidified soil as the railway subgrade.
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Keywords:
- silt /
- solidified soil /
- subgrade fill /
- dynamic characteristic
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图 1 固化土样逐级加载下的变形
Figure 1. Deformations under progressive loading of solidified soil samples
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图 2 各配比下的动应力-动应变关系曲线
Figure 2. Dynamic stress-dynamic strain relationship curve under each ratio
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图 3 各配比下的阻尼比-动剪应变关系曲线
Figure 3. Damping ratio-dynamic shear strain curves under different mix propotions
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图 5 各配比下的动应力幅值-最终累积塑性变形关系曲线
Figure 5. Dynamic stress amplitude-final cumulative plastic deformation curves
表 1 现场疏浚淤泥物理性质指标
Table 1 Physical property indices of dredged silt on site
干密度/
(g·cm-3)液限/
%塑限/
%塑性指数/
%黏粒含量/
%粉粒含量/
%砂粒含量/
%PH值 0.7 36.2 19.7 17.0 39.0 60.4 0.6 6.5 
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表 2 试验工况方案
Table 2 Test schemes for working conditions
初始含水率/% 单掺水泥/
%强度/
kPa双掺粉煤灰/% 强度/
kPa50 6 759 15 621 60 8 645 871 70 10 654 772
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