Centrifugal model tests on stability of maritime dams constructed by geobag-solidified soil
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摘要: 固化土充填袋筑堤技术既节约了日益紧缺的砂石资源，又解决了矿渣和疏浚弃土的处置难题，具有广阔的应用前景。依托天津港某围堤工程，通过开展离心模型试验，研究以钢渣与疏浚弃土为主要原料的固化土充填袋围堤的整体稳定性和变形情况，并分析地基中土压力和孔隙水压力变化规律，试验结果表明：固化土充填袋围堤和地基的沉降主要发生在填筑期，并且沉降速率较大；堤身范围内，沉降呈中间大两边小的锅型分布；从堤脚泥面的沉降曲线和孔隙水压力的消散上看，正常情况下，固化土充填袋围堤和地基能保持稳定状态；固化土充填袋围堤和地基的失稳破坏现为圆弧滑动破坏，变形以沉降为主，水平位移较小，土工织物充填袋对堤体水平变形有很强的约束作用，通过离心模型试验得出的稳定安全系数为1.59。Abstract: The technology of maritime dams constructed by geobag-solidified soil saves the increasingly scarce sand and gravel resources and solves the problem of disposal of slag and dredged spoil. It has broad application prospects. Relying on a maritime dam project in Tianjin Port, the centrifugal model tests are carried out to study the overall stability and deformation of the maritime dam filled with solidified soil using slag and dredged spoil as the main raw materials, and the variation laws of soil pressure and pore water pressure in the foundation are analyzed. The test results show that the settlements of the maritime dam constructed by geobag-solidified soil and the foundation mainly occur during the filling period, and the settlement rate is large. Within the scope of the maritime dam, the settlements are distributed in a bell shape, which are large in the middle and small at both sides. Seen from the settlement curve of the mud surface at the toe of the maritime dam and the dissipation of pore water pressure, under the normal conditions, the maritime dam filled with solidified soil and the foundation can remain stable. The instability failure of the maritime dam filled with solidified soil as well as that of the foundation is now a circular sliding one. The deformation is mainly settlement, and the horizontal displacement is small. The geotextile bag has a strong constraint on the horizontal deformation of the maritime dam. The safety factor of stability obtained through the centrifugal model tests is 1.59.
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Keywords:
- slag /
- dredged spoil /
- geobag /
- stability /
- centrifugal model test
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表 1 充填袋材料的技术指标
Table 1 Main properties of geobag
名称 单位质量/ (g·m-2) 抗拉强度/N/50 mm 延伸率/N/50 mm 孔径O95/mm 渗透系数/(cm·s-1) 经向 纬向 经向 纬向 聚丙烯编织布 ＞130 ＞750 ＞800 ＜30 ＜30 ≤0.05 ＞0.003 
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表 2 地基土层的主要物理力学性质
Table 2 Main physical and mechanical properties of soil layer
土层名称 厚度/m 含水率/% 密度/(g·cm-3) 固结快剪 十字板强度/ kPa 内摩擦角φcq/(°) 黏聚力c/kPa 淤泥质黏土 20 44.6 1.78 12.2 16.9 28
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