Abstract

Clay and silt have complicated effects on the undrained behaviour of sands. To study the influences of low clay and silt contents on the undrained behaviour of sands in the clay–silt–sand mixtures, sands with three different fine contents (0%, 5% and 10%) and three different fines mixing ratios were investigated based on the consolidated-undrained test by a strain-controlled triaxial testing system. The test results show that the static liquefaction takes place in clean sands under static loading; the undrained behaviours of the specimens are found to differ for the same fine content and different fine mixing ratios. The fines can simultaneously influence filling, bonding and soil skeleton characteristics of sand particles, and the extent of the influence on each characteristic varies depending on the clay and silt contents.

摘要

粘土和淤泥对沙子的不排水行为具有复杂的影响。为了研究低粘土和粉砂含量对粘土-粉砂-砂混合物中砂子不排水行为的影响，研究了三种不同细粉含量（0%、5% 和 10%）和三种不同细粉混合比的砂，基于通过应变控制的三轴试验系统进行固结不排水试验。试验结果表明，静态液化发生在静载荷下的洁净砂土中；发现相同细粒含量和不同细粒混合比的试件的不排水行为是不同的。细粉可同时影响砂粒的充填、粘结和土壤骨架特性，对每种特性的影响程度因粘土和粉砂含量而异。