Effect of fines content and plasticity on undrained shear strength of quartz-clay mixtures
Effect of fines content and plasticity on undrained shear strength of quartz-clay mixtures
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细粉含量和塑性对石英粘土混合物不排水剪切强度的影响
DOI：
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发表时间：
2018
影响因子：
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通讯作者：
S. Demir
中科院分区：
文献类型：
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作者：
E. Karakan;S. Demir
从以前的土壤钻孔中获得的数据显示，在野外很少遇到不含细粒的天然土壤。在此基础上，本研究的目的是探讨塑性细粒对砂（石英）-粘土混合物力学行为的影响。将两种类型的粘土（膨润土和高岭石）与石英以按干重计0%至100%的比率混合。根据临界细粒含量（FCt）随粘土类型和机械性能、稠度极限和压实特性的变化进行了评价。结果表明，不排水抗剪强度（su）降低到30%的高岭石含量，而增加与膨润土含量从0到100%，这是一个证据的粘土类型的影响FCt。此外，石英-高岭石混合物比石英-膨润土混合物具有更大的最大干容重。相反，石英-膨润土混合物的不排水剪切强度大于石英-高岭石混合物。
Data obtained from previous soil borings revealed that, natural soils free of fines are rarely encountered in the field. On this basis, the aim of this study is to investigate the effects of plastic fines on mechanical behavior of sand (quartz)-clay mixtures. Two types (bentonite and kaolinite) of clay were mixed with quartz at rates ranging among 0% to 100% by dry weight. Evaluations were made based on changes in threshold fines content (FCt) with clay type and mechanical properties, consistency limits, and compaction characteristics. The results indicate that undrained shear strength (su) decreased up to 30% kaolinite content while increased with bentonite content from 0 to 100% which is an evidence of the effect of clay type on FCt. Furthermore, quartz-kaolinite mixtures have greater maximum dry unit weight that quartz-bentonite mixtures. On the contrary, the undrained shear strength of quartz-bentonite mixtures was greater than quartz-kaolinite mixtures.