Experimental study of swelling in unsaturated compacted clays
Experimental study of swelling in unsaturated compacted clays
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DOI：
10.1180/0009855043940148
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发表时间：
2004-12-01
期刊：
影响因子：
1.5
通讯作者：
Hicher, PY
中科院分区：
文献类型：
--
作者：
Saiyouri, N;Tessier, D;Hicher, PY
本文描述了两种高度压实粘土的膨胀性能，即天然、未经处理的怀俄明州蒙脱石（MX 80）和富日白云母（FoCa 7），分别用Na和Ca饱和。初始压实的样品通过使其受到100 MPa至1 kPa范围内的不同抽吸压力而水合。对于每个平衡状态，测量体积变化（溶胀）和水含量（水合）。然后通过X射线衍射使用透射装置研究样品以确定层间距离和粒度，以澄清溶胀和水合机制。粘土层之间的距离在10埃和21.6埃之间，即对应于0和4个水层之间。在水化后，当抽吸压力从100 MPa降低到1 kPa时，MX 80和FoCa 7的颗粒尺寸分别从350和100粘土层/颗粒降低到10层/颗粒。第一溶胀阶段被描述为水分子在层之间的插入。然后观察到初始颗粒分裂成具有越来越大的颗粒间距离的较小尺寸的颗粒。透射电子显微镜的观察证实了这些结果。
This paper describes the swelling properties of two highly compacted clays, natural, untreated Wyoming montmorillonite (MX80) and Fourges sinectite (FoCa7), saturated with Na and Ca, respectively.The initially compacted samples were hydrated by subjecting them to different suction pressures in a range between 100 MPa and 1 kPa. For each equilibrium state, the volume change (swelling) and water content (hydration) were measured. The samples were then studied by X-ray diffraction using a transmission device to determine interlayer distance and particle size, in order to clarify both the swelling and hydration mechanisms. The distances between clay layers ranged between 10 and 21.6 Angstrom, i.e. corresponding to between 0 and 4 water layers. Upon hydration, the particle size decreased from 350 and 100 clay layers per particle to 10 layers per particle when the suction pressure decreased from 100 MPa to 1 kPa for MX80 and FoCa7, respectively. The first swelling stage is described as being an insertion of water molecules between the layers. Then a division of the initial particles into particles of smaller size with increasingly large inter-particle distances was observed. Observations by transmission electronic microscopy confirmed these results.