融化饱和哈尔滨黏土的应变速率效应试验研究

发布时间：2018-05-07 07:01

本文选题：土力学 + 融化黏土　；参考：《岩石力学与工程学报》2017年06期

【摘要】：对饱和哈尔滨黏土进行7次冻融循环后,在不同围压和应变速率下进行固结不排水三轴剪切试验,分析融化饱和黏土的有效偏应力及孔隙水压力随应变速率的发展规律。结果表明,融化饱和哈尔滨黏土在小于240 kPa的围压下表现出超固结特性,在240 kPa围压下表现为正常固结或者轻度超固结特性。随着应变速率的增大,融化哈尔滨黏土的强度变化规律以0.15 h~(-1)为节点分为2个阶段:当应变速率小于0.15 h~(-1)时,试件的强度随着速率的增大先增大后减小,当应变速率超过0.15 h~(-1)时,试件的强度随着速率的增大持续增大;孔隙水压力的发展趋势随着围压的增大由软化型转变为硬化型,但各围压下的应变速率效应对孔隙水压力的发展趋势影响不明确;利用广义双曲线模型对试验数据进行分析拟合,研究表明,该模型能够合理的描述融化哈尔滨黏土的应变速率效应。
[Abstract]:After seven freeze-thaw cycles of saturated Harbin clay, undrained triaxial shear tests were carried out under different confining pressures and strain rates. The results show that the melt saturated Harbin clay exhibits overconsolidation at confining pressure less than 240 kPa and normal consolidation or slight overconsolidation at 240 kPa confining pressure. With the increase of strain rate, the strength variation of melting Harbin clay is divided into two stages: when the strain rate is less than 0.15 hu ~ (-1), the strength of the sample increases first and then decreases with the increase of strain rate. When the strain rate exceeds 0.15 h ~ (-1), the strength of the specimen increases with the increase of the rate, and the development trend of pore water pressure changes from softening type to hardening type with the increase of confining pressure. However, the influence of strain rate effect on the development trend of pore water pressure is not clear, and the generalized hyperbolic model is used to analyze and fit the test data. The model can reasonably describe the strain rate effect of melting Harbin clay.
【作者单位】：哈尔滨工业大学交通科学与工程学院;辽宁省交通科学研究院有限责任公司;
【基金】：国家自然科学基金资助项目(51408163,51578200) 黑龙江省自然科学基金重点项目(ZD201218)~~
【分类号】：TU41

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