南宁外环膨胀土抗剪强度非线性特征及影响因素分析

发布时间：2018-05-03 01:25

本文选题：道路工程 + 膨胀土　；参考：《中国公路学报》2014年10期

【摘要】：以南宁外环膨胀土为对象,开展含低应力条件的不同干密度、不同初始含水率、无荷和有荷干湿循环作用重塑样、有荷干湿循环作用原状样的饱和慢剪以及重塑样饱和三轴固结排水试验,研究干密度、初始含水率、无荷和有荷干湿循环作用等因素对其低应力条件下抗剪强度的影响。结果表明:各抗剪强度包线均呈非线性特征,可用广义幂函数很好地拟合;低应力、干密度及初始含水率对饱和慢剪强度的影响显著;试件初始含水率相同时,干密度越大,强度越大;干密度相同时,初始含水率越大,强度也越大;随干湿循环次数的增加,无荷条件下土样的抗剪强度衰减强于有荷条件。
[Abstract]:Taking the expansive soil around the outer ring of Nanning as the object, different dry density, different initial moisture content, no load and dry and wet cycle remolding samples with low stress conditions were carried out. The effects of dry density, initial moisture content, load free and dry wet cycle on the shear strength under low stress were studied by the saturated slow shear test of the undisturbed sample and the saturated triaxial consolidation and drainage test of the remolded sample under dry and wet cycles, and the effects of dry density, initial moisture content, load free and loaded dry and wet cycle on the shear strength were studied. The results show that all the shear strength envelope lines are nonlinear and can be fitted well by generalized power function. The effects of low stress, dry density and initial moisture content on saturated slow shear strength are significant, and the dry density increases with the same initial moisture content. The higher the strength is, the greater the initial moisture content is, and the greater the strength is when the dry density is the same. With the increase of dry and wet cycle times, the shear strength of soil samples under load condition is stronger than that under loading condition.
【作者单位】：长沙理工大学交通运输工程学院;
【基金】：国家自然科学基金项目(50978035,51108049) 交通运输部西部交通建设科技项目(2009 353 311 060) 道路灾变防治及交通安全教育部工程研究中心开放基金项目(kfi090303) 广西交通科技项目(2011-20)
【分类号】：U412.22

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