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以南京砂的固结不排水试验为基础,对其稳态特征进行了研究。结果表明:在低围压下稳态线的曲线表达更符合实际情况,松散南京砂在低围压下广义剪应力终值接近于0而表现出不稳定;稳态是土体固有属性,稳态内摩擦角不仅可以通过稳定状态下ps?s–qs?s的关系得到,也可通过同一围压下不同密实度南京砂的有效应力路径末端拟合得到,本研究得到南京砂稳态内摩擦角为35.2°;峰值强度高估了流滑中土体的强度,土体实际发挥的是残余强度,研究中建立了南京砂峰值强度和残余强度的关系;脆性指数能较好地反映南京砂应变软化程度和流滑的可能性;孔隙比的微小变化可导致南京砂软化程度的较大变化。
Based on the consolidated undrained test of Nanjing sand, the steady-state characteristics were studied. The results show that the curve of steady state curve under low confining pressure is more in line with the actual situation. The final value of generalized shear stress at low confining pressure of loose Nanjing sand is close to zero and it shows instability. Steady state is an intrinsic property of soil and stable The internal friction angle can be obtained not only by the relationship of ps? S-qs? S in steady state, but also by the end of effective stress path of Nanjing sand with different densities under the same confining pressure. In this study, The friction angle is 35.2 °; the peak intensity overestimates the strength of the soil in the slippery slippery slope, and the soil actually exerts its residual strength. The relationship between the peak sand strength and the residual strength of the sandstone is established in this study. The degree of sand strain softening and the possibility of slippery flow; small changes in void ratio can lead to large changes in Nanjing sand softening degree.