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首页> 外文期刊>Mechanics of materials >Volume change behaviour of clays: the influence of mineral composition, pore fluid composition and stress state
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Volume change behaviour of clays: the influence of mineral composition, pore fluid composition and stress state

机译：粘土的体积变化行为：矿物组成，孔隙流体组成和应力状态的影响

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This paper analyses the influence of mineral composition, pore fluid composition and stress state on volume change behaviour of four different clayey soils: the Ponza bentonite, a commercial kaolin, the Bisaccia and the Marino clays. In order to investigate the role of the smectite content, also artificial bentonite-kaolin mixtures were tested. Oedometer tests were carried out on the materials "reconstituted"―according to Burland's suggestions [Geotechnique XL (3) (1990) 329-378]―with distilled water, concentrated NaCl solutions and a non-polar fluid (cyclohexane). Some tests were carried out on dry materials. The results show that volume change behaviour of artificial mixtures and natural soils reconstituted with distilled water is strongly influenced by mineral composition and, in particular, by the smectite fraction. The influence on compression and swelling indices decreases with increasing axial stress, whereas, with respect to the coefficients of consolidation and swelling, it remains high in the whole considered stress range. An increase in pore solution concentration causes a reduction in compressibility. The effect increases with the smectite content, thus reducing the differences among the different soils. In particular, compressibility of the bentonite reconstituted with concentrated salt solutions becomes more similar to that of the commercial kaolin―which, in turn, is poorly influenced by pore solution concentration―than to that of the water-saturated bentonite. The dependence on the stress level of the effects of pore solution composition on both volume change indices and coefficients, is qualitatively similar to that of the effects of mineral composition. The materials prepared with cyclohexane behave similarly to the dry ones and they both are less compressible than the materials prepared with aqueous solutions. The coefficient of consolidation increases dramatically and swelling is negligible in the whole considered stress range. The changes seem to depend on an increase in resistance to interparticle sliding. In the case of the Ponza and Bisaccia clays, this hypothesis is supported also by the results of direct shear tests.
机译：本文分析了矿物成分，孔隙流体成分和应力状态对四种不同黏土的体积变化行为的影响：Ponza膨润土，商品高岭土，Bisaccia和Marino黏土。为了研究蒙脱石含量的作用，还测试了人造膨润土-高岭土混合物。根据Burland的建议[Geotechnique XL（3）（1990）329-378]，使用蒸馏水，浓NaCl溶液和非极性流体（环己烷）对“重构”的材料进行了里程表测试。对干燥的材料进行了一些测试。结果表明，用蒸馏水重构的人工混合物和天然土壤的体积变化行为受矿物成分，尤其是蒙脱石成分的强烈影响。随着轴向应力的增加，对压缩和溶胀指数的影响减小，而就固结和溶胀系数而言，在整个考虑的应力范围内，其影响仍然很高。孔溶液浓度的增加导致可压缩性降低。效果随着蒙脱石含量的增加而增加，从而减少了不同土壤之间的差异。尤其是，用浓盐溶液重构的膨润土的压缩性变得比水饱和膨润土的压缩性与商用高岭土的压缩性更加类似，而高岭土的反过来受孔溶液浓度的影响很小。孔隙度组成对体积变化指数和系数的影响取决于应力水平，其定性与矿物组成的影响相似。用环己烷制备的材料的性能与干燥的相似，并且它们均比用水溶液制备的材料压缩性低。在整个考虑的应力范围内，固结系数急剧增加，而膨胀可忽略不计。这些变化似乎取决于对颗粒间滑动的抵抗力的增加。对于Ponza和Bisaccia粘土，这种假设也得到直接剪切试验结果的支持。

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