本文選題：原狀黃土 + 平面應變試驗��； 參考：《土木工程學報》2017年10期

【摘要】：黃土工程中有許多平面應變問題。模擬黃土原位沉積方向,通過開展均壓固結(jié)豎向加載和側(cè)向卸載的平面應變試驗,揭示剪切變形特性和屈服、破壞強度變化規(guī)律。表明黃土豎向柱狀結(jié)構(gòu)抵抗壓縮作用,結(jié)構(gòu)屈服前側(cè)脹變形很小,結(jié)構(gòu)屈服后側(cè)脹變形發(fā)展明顯,存在明顯的屈服特征,剪切過程呈剪縮硬化性,屈服強度不同于破壞強度;側(cè)向卸載條件下側(cè)脹變形發(fā)展明顯,結(jié)構(gòu)屈服前豎向壓縮變形增長較小,結(jié)構(gòu)屈服后豎向壓縮變形增長較大,也存在明顯的屈服特征,剪切過程呈剪脹理想塑性,屈服強度與破壞強度近似一致;黃土的豎向加載強度線和側(cè)向卸載強度線服從同一變化規(guī)律。不同含水率黃土豎向加載與側(cè)向卸載的剪切變形特性和強度變化規(guī)律相似,同一含水率黃土的平面應變強度線近似呈同一線性變化規(guī)律。隨著含水率的增大,黃土的屈服強度線和破壞強度線依次降低。
[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.
【作者單位】： 西安工業(yè)大學;西安理工大學;
【基金】：西安工業(yè)大學校長基金(XAGDXJJ16018)
【分類號】：TU444

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