泥岩含量对昔格达土填料路用性质的影响研究

发布时间：2018-10-22 07:40

【摘要】：为研究泥岩含量对昔格达土混合填料路用性质的影响,对不同泥岩含量的混合料进行重型击实、无侧限抗压强度、CBR及回弹模量试验。试验结果表明:随机混合料的最优含水率与最大干密度除受泥岩颗粒粒径、含水量及泥岩含量的影响外,主要取决于混合料中泥质粉砂岩的含量;昔格达土人工混合料室内击实结果与实际的天然随机混合料的击实结果存在显著差异,应根据实际工程混合填料中泥岩含量、含水量、板结程度及团块状泥岩量等对混合料最大干密度和最优含水量进行动态取值。当泥岩含量(质量分数)低于65%时,混合料无侧限抗压强度随泥岩含量增加而线性增大,当泥岩含量大于65%后混合料无侧限抗压强度随泥岩含量增加而减小;混合料回弹模量值随泥岩含量的增加而增大;通过对泥岩含量与CBR值间的多项式回归分析,建立了混合料CBR值与泥岩含量的多项式回归方程,两者间相关性良好。
[Abstract]:In order to study the influence of mudstone content on the road properties of Xigeda soil mixed filler, the tests of heavy compaction, unconfined compressive strength, CBR and elastic modulus of mixture with different mudstone content were carried out. The experimental results show that the optimal moisture content and maximum dry density of random mixture are mainly determined by the content of mudstone in the mixture, except for the influence of the particle size, water content and mudstone content. The results of laboratory compaction of Xigeda soil artificial mixture are significantly different from those of actual natural random mixture, so the content of mudstone and water content of mixed filler in actual engineering should be considered. The maximum dry density and optimum moisture content of mixture are determined dynamically by the degree of cementation and the amount of mass mudstone. When the content of mudstone (mass fraction) is lower than 65, the unconfined compressive strength increases linearly with the increase of mudstone content, and decreases with the increase of mudstone content when mudstone content is more than 65%. Through the polynomial regression analysis between mudstone content and CBR value, the polynomial regression equation of mixture CBR value and mudstone content is established, and the correlation between them is good.
【作者单位】：西昌学院工程技术学院;
【基金】：四川省教育厅科研基金项目(13ZB0169);四川省教育厅科研项目(14CZ0022)资助
【分类号】：U414

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