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张涵超, 扈胜霞, 李海龙, 林森, 李文娜. 南昌重塑红土变形特性三轴试验研究[J]. 岩土工程学报, 2023, 45(S1): 119-122. DOI: 10.11779/CJGE2023S10012
引用本文: 张涵超, 扈胜霞, 李海龙, 林森, 李文娜. 南昌重塑红土变形特性三轴试验研究[J]. 岩土工程学报, 2023, 45(S1): 119-122. DOI: 10.11779/CJGE2023S10012
ZHANG Hanchao, HU Shengxia, LI Hailong, LIN Sen, LI Wenna. Characteristics of triaxial deformation of Nanchang laterite[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(S1): 119-122. DOI: 10.11779/CJGE2023S10012
Citation: ZHANG Hanchao, HU Shengxia, LI Hailong, LIN Sen, LI Wenna. Characteristics of triaxial deformation of Nanchang laterite[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(S1): 119-122. DOI: 10.11779/CJGE2023S10012

南昌重塑红土变形特性三轴试验研究

Characteristics of triaxial deformation of Nanchang laterite

  • 摘要: 对南昌市东华理工大学附近工地取得的红土,按天然含水率23%,制取了密度为1.75,1.80,1.85,1.90,1.95 g/cm3的三轴重塑土样,开展了围压分别为50,100,200,300 kPa的5组20个固结排水三轴剪切试验。绘制了不同密度时各组南昌压实红土的应力-应变、体应变-应力关系曲线,对南昌重塑红土CD条件下剪切变形特性进行分析并对剪切变形进行了分段,探讨了红土中团聚体对其剪切变形的影响。绘制了 \varepsilon _\textv\text - q , \varepsilon _\textv\text - p , \varepsilon _\textv\text - q/p 曲线,讨论了土样的体应变与平均主应力p、偏应力q之间的关系。结果表明:南昌重塑红土CD条件下的三轴剪切变形可分为三个阶段,这主要与土样中团聚体破裂程度有关。在剪应力q=50 kPa时,团聚体破裂,而土体的剪切变形是平均主应力、偏应力耦合作用的结果,在q/p=1.5时,土样破坏。

     

    Abstract: The laterite, from the site near the East China University of Technology, is made into the triaxial remodeled soil samples with the natural moisture content of 23% and the densities of 1.75, 1.80, 1.85, 1.90, 1.95 g/cm3. The triaxial shear tests on 5 groups of 20 soil samples are carried out under consolidation and drainage (CD) conditions with the confining pressures of 50, 100, 200, 300 kPa. The stress-strain and volumetric strain-stress curves for each group of Nanchang compacted laterite at different densities are plotted and segmented, and the shear deformation characteristics of Nanchang remodeled laterite under CD conditions are analyzed. The effects of agglomerates in the laterite on the shear deformation are discussed. The results show that the triaxial shear deformation under CD conditions of remodeled laterite can be divided into three stages, which are mainly related to the degree of rupture of agglomerates in the soil samples. When the shear stress equal to 50 kPa, the agglomerates rupture. The shear deformation of the soil is the result of the coupling effects of the mean principal stress and the partial stress, and the soil samples break down at q/p=1.5.

     

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