加筋粗粒土大型三轴试验研究

发布时间：2018-05-01 04:39

本文选题：加筋粗粒土 + 大型三轴试验　；参考：《四川大学学报(工程科学版)》2014年02期

【摘要】：采用大型三轴剪切仪,对粗粒土、加筋粗粒土强度变形特性进行了试验研究。试验结果表明:不同围压条件下粗粒土和加筋粗粒土剪切的应力-应变关系类似,应力应变关系表现为应变硬化型;当轴向应变较小时,加筋效果不明显,随着轴向应变的逐渐增大,加筋效果逐渐发挥;粗粒土加筋后的内聚力c有明显增加,但是内摩擦角φ基本不变,侧向变形减小,体积变形增大;对邓肯-张模型的适用性进行分析,表明邓肯-张模型中切线弹性模量能很好适用于加筋粗粒土,但不能很好地反映加筋粗粒土变形特性。在试验的基础上提出了轴向应变与侧向应变的二次函数关系,建立了粗粒土的体积应变与轴向应变的函数方程,并对粗粒土以及加筋粗粒土的三轴试验体积应变数据进行了预测。
[Abstract]:The strength and deformation characteristics of coarse grained soil and reinforced coarse grained soil were studied by using a large triaxial shear apparatus. The test results show that the stress-strain relationship between coarse grained soil and reinforced coarse grained soil is similar under different confining pressure, and the stress-strain relationship is strain hardening type, but the effect of reinforcement is not obvious when axial strain is small. With the increasing of axial strain, the reinforcement effect is gradually brought into play, the cohesive force c of coarse grained soil increases obviously, but the internal friction angle 蠁 is basically unchanged, the lateral deformation decreases and the volume deformation increases. The applicability of Duncan-Zhang model is analyzed. It is shown that tangent elastic modulus of Duncan-Zhang model is suitable for reinforced coarse grained soil, but it can not reflect deformation characteristics of reinforced coarse grained soil. On the basis of experiments, the quadratic function relation of axial strain and lateral strain is presented, and the function equation of volume strain and axial strain of coarse grained soil is established. The volume strain data of coarse grained soil and reinforced coarse grained soil in triaxial test are predicted.
【作者单位】：中南大学土木工程学院;四川省冶金地质勘查局水文工程大队;
【基金】：国家自然科学基金资助项目(51378514) 高速铁路建造技术国家工程实验室基金资助项目(2008G031-Q)
【分类号】：TU411

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