小麦堆修正剑桥模型的参数研究

Research on Parameters of Modified Cam Clay for Wheat Pile

通过TSZ-6A应变控制式三轴仪对小麦堆(宁麦13号)进行三轴压缩试验,测定并计算出小麦堆修正剑桥模型的参数:临界状态应力比M、对数硬化模量λ、等向膨胀指数κ和弹性模量E。试验结果表明:小麦堆含水率为10.20%,12.46%,14.05%w.b.时,临界状态应力比M分别为0.924 9,1.013 1,0.978 5;对数硬化模量λ分别为0.067 7,0.061 3,0.073 3;等向膨胀指数κ分别为0.025 4,0.027 0,0.026 3。含水率对M、λ和κ无显著性影响,对试验数据进行分析,推导出弹性模量E与广义剪切力q和平均主应力p的关系式。

The critical state ratio M,the logarithmic hardening modulusk, the isotropic swelling indexK and the elastic modulus E of Modified Cam Clay of wheat pile were measured by triaxial apparatus through triaxial compres- sion tests for wheat pile. The experimental results revealed that the critical state ratio of wheat with three different moisture content（ 10.20%, 12.46%, 14.05% w.b. ） were 0.924 9,1. 013 1 and 0. 978 5 respectively the logarith- mic hardening modulus were 0. 067 7,0.061 3 and 0. 073 3 ,the isotropic swelling index were 0. 025 4,0.027 0 and 0. 026 3. The critical state ratio, the logarithmic hardening modulus and the isotropic swelling index have no significant relevance to the moisture content, the relation equations between the elastic modulus with generalized shearing force and mean principal stress were obtained from the analysis of the experimental results.