Stone Index and strength properties of clay – gravel mixtures j
Stone Index and strength properties of clay – gravel mixtures j
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粘土-砾石混合物的石指数和强度特性 j
DOI：
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发表时间：
2012
期刊：
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通讯作者：
B. Kyambadde
中科院分区：
文献类型：
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作者：
B. Kyambadde
本文报告了对细砾石和高塑性粘土的混合物进行落锥试验和准静态锥入度试验的结果。砾石对混合物塑性的影响通过直接测试混合物获得的液体和塑性极限的推导来量化。本研究中使用的塑限定义为液限不排水强度增加一百倍对应的含水量，用PL100表示。液限是通过传统的落锥测试确定的。混合物的塑性范围通过塑性指数定义，塑性指数源自落锥液限和 PL100 指数。研究表明，可以量化细粒和粗粒土壤混合物的塑性，而无需去除较粗的部分。对于大于约 50% 的砾石体积分数，观察到粗粒部分对不排水剪切强度和指数特性的影响是显着的。该砾石体积分数与砾石的最大空隙比相关，这表明高砾石含量下砾石颗粒之间的相互作用导致对混合物行为的摩擦贡献。
This paper reports the results of fall-cone tests and quasi-static cone penetration tests undertaken on mixtures of fine gravel and highly plastic clay. The influence of the gravel on the plasticity of the mixture is quantified through the derivation of liquid and plastic limits obtained by direct testing of the mixture. The plastic limit used in this study is defined as the moisture content corresponding to a hundredfold increase in the liquid limit undrained strength, and is denoted by PL100. Liquid limits were determined from conventional fall-cone tests. The range of plasticity of the mixture is defined through the plasticity index, derived from the fall-cone liquid limit and the PL100 index. The study demonstrates that the plasticity of mixtures of fineand coarse-grained soil can be quantified without the requirement to remove the coarser fraction. The influence of the coarse fraction on both the undrained shear strength and the index properties was observed to be significant for gravel volume fractions greater than about 50%. This gravel volume fraction is associated with the maximum void ratio of the gravel, which suggests that interaction between the gravel particles at high gravel contents results in a frictional contribution to the mixture behaviour.