This study investigated the performance of unreinforced and geogrid-encased cement-stabilized dredged slurry columns by uniaxial compression tests to simulate the extreme case where the surrounding soil offers no confinement. The objective was to understand the strength characteristics and visualize the deformation damage patterns of the columns with respect to the water content, cement content, length-to-diameter ratio, and geogrid strength. The results show that the unreinforced specimens exhibited strain-softening behavior, whereas geogrid encasement induced strain-hardening, with high-strength geogrids showing superior strain-hardening capacity. Notably, regardless of geogrid strength, encasement enhanced the resistance to deformation and ductility of the columns. Increasing the cement content, reducing the water content, and decreasing the length-to-diameter ratio all contributed to higher peak strength in both unreinforced and geogrid-encased specimens. Geogrid encasement provides confinement that enhances peak strength. The influence of geogrid encasement on peak strength becomes more pronounced at lower cement contents, higher water contents, and higher length-to-diameter ratios. Geogrid encasement also affects failure modes, altering the predominant inclined shear failure observed at the top of unreinforced specimens. Specimens encased with geogrids of higher tensile strength exhibit enhanced integrity and deformation resembling compression strut buckling, with a symmetrically inclined failure trend at the top and bottom.

中文翻译：

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土工格栅水泥固化疏浚浆柱单轴压缩试验

本研究通过单轴压缩试验研究了无筋土工格栅包裹的水泥稳定疏浚泥浆柱的性能，以模拟周围土壤不提供约束的极端情况。目的是了解强度特征并可视化柱在含水量、水泥含量、长径比和土工格栅强度方面的变形损伤模式。结果表明，未加筋的试件表现出应变软化行为，而土工格栅包裹则引起应变硬化，其中高强土工格栅表现出优异的应变硬化能力。值得注意的是，无论土工格栅强度如何，包裹都增强了柱的抗变形能力和延展性。增加水泥含量、降低水含量和降低长径比都有助于提高未加筋和土工格栅包裹样本的峰值强度。土工格栅包裹提供了增强峰值强度的限制。在水泥含量较低、含水量较高和长径比较高时，土工格栅包裹对峰值强度的影响变得更加明显。土工格栅包裹也会影响破坏模式，改变在未加固样本顶部观察到的主要倾斜剪切破坏。用较高抗拉强度的土工格栅包裹的样本表现出增强的完整性和类似于压缩支柱屈曲的变形，在顶部和底部具有对称倾斜的破坏趋势。