冻融循环对石灰处置粉质黏土静强度影响研究

发布时间：2018-01-22 23:26

本文关键词： 冻融循环石灰处置粉质黏土静强度　出处：《岩土力学》2015年S2期 　论文类型：期刊论文

【摘要】：以吉林-荒岗高速公路沿线的粉质黏土为研究对象,对不同石灰掺入比的土样试件进行0、2、4、6、8、10、12次冻融循环试验。通过室内静三轴试验,研究了冻融循环作用对石灰处置粉质黏土强度的影响。研究结果表明,石灰处置粉质黏土的应力-应变关系曲线呈应变软化型,峰值强度随围压增大而升高,粉质黏土峰值强度降低幅度值比石灰处置粉质黏土峰值强度降低幅度值大,经历4次冻融后应力-应变曲线峰值强度趋于稳定;冻融作用后石灰处置粉质黏土抗剪强度衰减率比粉质黏土的抗剪强度衰减率小,抗剪强度随围压的升高而增大;同一围压条件下石灰处置粉质黏土弹性模量随着冻融次数增加逐渐减小,经历4次冻融后基本趋于稳定。
[Abstract]:Taking silty clay along Jilin-Huanggang expressway as the research object, the soil samples with different lime mixing ratios were studied. The effect of freeze-thaw cycle on the strength of silty clay treated by lime was studied by laboratory static triaxial test. The stress-strain curve of lime treated silty clay shows strain softening type, and the peak strength increases with the increase of confining pressure. The decrease amplitude of peak strength of silty clay is larger than that of lime treated silty clay, and the peak strength of stress-strain curve tends to be stable after four freeze-thaw cycles. The shear strength attenuation rate of lime treated silty clay is smaller than that of silty clay after freezing and thawing, and the shear strength increases with the increase of confining pressure. Under the same confining pressure, the elastic modulus of silty clay treated with lime decreases gradually with the increase of freezing and thawing times, and tends to be stable after four freeze-thaw times.
【作者单位】：吉林建筑大学交通科学与工程学院;
【基金】：吉林省交通运输科技计划项目(No.2011103,No.2012-4-1-9)
【分类号】：TU442
【正文快照】： 1引言季节性冰冻地区的公路路基土在经历冻融循环后强度发生了不同程度的衰减,如果路基土中水分不能及时排出,冻结土融化后就转变为土颗粒泥浆而丧失承载能力,严重影响道路运行安全。从远处采购调运土成本很高,就地取材并对其改良成为降低成本的有效途径。国内外学者关于土质

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