黄土斜坡土体强度特性的三轴试验研究

发布时间：2018-04-20 09:54

  本文选题：黄土 + 三轴剪切试验　； 参考：《干旱区资源与环境》2014年08期

【摘要】：以陕西泾阳南塬某黄土斜坡第九层(L9)黄土为研究对象,采用常规三轴试验探讨土体在三轴剪切过程中的应力~应变关系、含水率和围压对抗剪强度的影响、粘聚力和内摩擦角随含水率的变化规律等问题。试验成果表明:1)w=5.3%时,L9黄土应力~应变曲线呈应变软化,试样在50KPa、100KPa围压下发生脆性破坏;w=12.3%、19.3%、25%时,应力~应变曲线均表现为应变硬化,试样呈塑性破坏。2)在相同围压下,L9黄土抗剪强度随含水率的增加而减小;含水率从19.3%增加到25%(饱和)时,抗剪强度下降最快,降幅达75%。3)随着含水率的增加,L9黄土的粘聚力和内摩擦角降低;粘聚力在w=5.3%~12.3%阶段内下降最快,降幅达73%;内摩擦角在w=19.3%~25%阶段内下降最快,降幅为60%。研究成果对于今后黄土塬滑坡(边坡)工程治理、监测,尤其是黄土塬边坡安全的早期预测有重要的参考价值。
[Abstract]:Taking the ninth layer L9 loess of a loess slope in Jingyang Nanyuan, Shaanxi Province as the research object, the stress-strain relationship of soil in triaxial shear process, the influence of moisture content and confining pressure on shear strength were studied by conventional triaxial test. The change of cohesion and internal friction angle with moisture content and so on. The test results show that the stress-strain curve of Loess is strain-softening, and the brittle failure occurs at the confining pressure of 50KPa-100KPa. The stress-strain curves show strain hardening at 25 鈩，

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