原状黄土的平面应变剪切、屈服性状的试验研究

发布时间：2018-05-08 16:05

本文选题：原状黄土 + 平面应变试验　；参考：《土木工程学报》2017年10期

【摘要】：黄土工程中有许多平面应变问题。模拟黄土原位沉积方向,通过开展均压固结竖向加载和侧向卸载的平面应变试验,揭示剪切变形特性和屈服、破坏强度变化规律。表明黄土竖向柱状结构抵抗压缩作用,结构屈服前侧胀变形很小,结构屈服后侧胀变形发展明显,存在明显的屈服特征,剪切过程呈剪缩硬化性,屈服强度不同于破坏强度;侧向卸载条件下侧胀变形发展明显,结构屈服前竖向压缩变形增长较小,结构屈服后竖向压缩变形增长较大,也存在明显的屈服特征,剪切过程呈剪胀理想塑性,屈服强度与破坏强度近似一致;黄土的竖向加载强度线和侧向卸载强度线服从同一变化规律。不同含水率黄土竖向加载与侧向卸载的剪切变形特性和强度变化规律相似,同一含水率黄土的平面应变强度线近似呈同一线性变化规律。随着含水率的增大,黄土的屈服强度线和破坏强度线依次降低。
[Abstract]:There are many plane strain problems in loess engineering. The in-situ deposition direction of loess is simulated. The shear deformation characteristics, yield and failure strength of loess are revealed by plane strain tests of vertical loading and lateral unloading. The results show that the vertical columnar structure of loess resist compression, the expansion deformation of the front side of the structure yield is very small, the expansion deformation of the back side of the structure yield is obvious, there are obvious yield characteristics, the shear process is shear-shrinkage hardening, and the yield strength is different from the failure strength. Under the condition of lateral unloading, the lateral expansion deformation develops obviously, and the vertical compression deformation of the structure before yielding is small, and the vertical compression deformation increases greatly after the structure yield, and there is obvious yield characteristic, and the shear process is shear-expansion ideal plasticity. The yield strength is approximately consistent with the failure strength, and the vertical loading strength line and the lateral unloading strength line suit change from the same rule. The shear deformation characteristics and strength variation of loess with different moisture content are similar to those of lateral unloading. The plane strain intensity line of loess with the same moisture content is approximately the same linear variation rule. With the increase of water content, the yield strength line and failure strength line of loess decrease in turn.
【作者单位】：西安工业大学;西安理工大学;
【基金】：西安工业大学校长基金(XAGDXJJ16018)
【分类号】：TU444

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