Miniature cone tip resistance of sand with fly ash using triaxial setup
Miniature cone tip resistance of sand with fly ash using triaxial setup
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DOI：
10.1139/t08-112
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发表时间：
2009-02
影响因子：
3.6
通讯作者：
J. Kumar;K. Raju
中科院分区：
文献类型：
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作者：
J. Kumar;K. Raju
在作者最近工作的延续中，使用三轴设备确定了干砂与干粉煤灰混合样品的微型锥体的最终尖端阻力。考察了(1)粉煤灰掺量、(2)试样相对密度、(3)覆盖层竖向压力对试验结果的影响。结果表明，在相同的相对密度范围内，在砂土中加入粉煤灰可显著降低锥顶阻力q（cu）。这是由于在给定的相对密度下，随着粉煤灰含量的增加，试样的摩擦角（phi）减小。对于大于约30度的phi，从已发表的文献中得到的两个广泛使用的相关曲线，提供了q（cu）和无黏性土壤之间的关系，被发现提供了令人满意的预测，即使是砂-粉煤灰混合物。正如预期的那样，随着土体相对密度和试样竖向有效（覆盖层）应力的增加，qcu值不断增加。
In a continuation of the authors' recent work, the ultimate tip resistance of a miniature cone using triaxial equipment was determined for samples of dry sand mixed with dry fly ash. The effect of (i) the proportion of fly ash, (ii) the relative density of samples, and (iii) the vertical overburden pressure was examined. It was noted that an addition of fly ash in sand for the same range of relative density leads to a significant reduction in the ultimate tip resistance of the cone (q(cu)). This occurs due to a decrease in the friction angle (phi) of the sample with an increase in the fly ash content for a given relative density. For phi greater than about 30 degrees, two widely used correlation curves from published literature, providing the relationships between q(cu) and phi for cohesionless soils, were found to provide satisfactory predictions, even for sand - fly ash mixtures. As was expected, the values of qcu increase continuously with an increase in the relative density of the soil mass and the vertical effective ( overburden) stress on the sample.