论文部分内容阅读
针对某级配砂土,对不同密度试样进行常规三轴固结排水剪切试验,探讨了密度对砂土应力应变特性、强度特性的影响。试验结果表明:密度对砂土应力应变的形态影响不大,对试样破坏时的轴向应变有显著影响;砂土试样发生相变时的体积应变受密度影响显著。通过研究密度和围压对变形的影响,定量分析了相变体积应变随相对密实度和围压的变化关系,同时,发现砂土密度对其变形模量影响较大;密度对试样破坏偏应力比影响较大。试样砂土的强度指标总体上随相对密实度增大而增大,但在试验范围内影响有限。对非线性指标φ_0,Δφ,随试样相对密实度变化均可近似用直线表示;D_r每增大0.1,内摩擦角φ增大0.66°。
According to the sand with a certain level, conventional three-axis consolidation drainage and shear tests on different density samples were carried out to discuss the effect of density on the stress-strain and strength characteristics of sand. The test results show that density has little effect on the shape of the sand-soil stress-strain and has a significant effect on the axial strain when the specimen is damaged. The volumetric strain of the sand specimen during the phase-change is significantly affected by the density. By studying the influence of density and confining pressure on the deformation, the relationship between the volumetric strain and the relative density and the confining pressure was quantitatively analyzed. At the same time, it was found that the density of sand had a great influence on the deformation modulus; Stress ratio greater impact. The strength index of the sample sand generally increases with relative density, but it has limited influence in the test range. The nonlinear index φ_0, Δφ, with the relative density of the sample can be approximated by a straight line; D_r increase 0.1, the internal friction angle φ increased 0.66 °.