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采用GDS静三轴试验系统,对延安-延川(陕晋界)高速公路隧道的Q2老黄土进行了固结不排水剪试验。结果表明:低围压下,应力应变关系表现为软化型,随着围压的增大,软化特性有所减弱,部分表现出硬化特性;随着干密度的变化,土的抗剪强度指标变化较大,干密度增大,粘聚力总体上呈现增大的趋势,而内摩擦角和干密度之间不具有很好的相关性。
The GDS static triaxial test system was used to test the consolidated undrained shear test of Q2 loess in the Yan’an-Yanchuan (Shaanxi-Shanxi boundary) expressway tunnel. The results show that under the low confining pressure, the relationship between stress and strain is softening. With the increase of confining pressure, the softening properties are weakened and some show hardening properties. With the variation of dry density, the change of shear strength of soil Larger, dry density increases, cohesion generally shows an increasing trend, while the internal friction angle and dry density is not very good correlation between.