Experimental and analytical investigations of volume change behaviour of saturated expansive soils in oedometer test
Experimental and analytical investigations of volume change behaviour of saturated expansive soils in oedometer test
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DOI：
10.1051/e3sconf/20199210006
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发表时间：
2019
影响因子：
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通讯作者：
Misa Hiraga;H. Kyokawa;J. Koseki
中科院分区：
文献类型：
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作者：
Misa Hiraga;H. Kyokawa;J. Koseki
对饱和膨润土的化学和力学行为进行了实验和分析研究。对饱和膨润土进行了一系列固结试验。通过更换细胞液在oedometer测试，一维渗透固结和溶胀行为进行了观察。实验结果进行了数值模拟，使用本构模型，考虑到电化学现象的粘土矿物晶体的宏观结构行为的影响。得出的结论是，典型的机械膨胀性的水饱和的膨润土在oedometer测试是由一个积极的粘性行为，由于较低的剪切强度的影响。渗透固结试验后，在oedometer的试样的横向收缩观察，这影响了随后的机械固结过程中的压缩性。孔隙流体中Na+的浓度影响膨润土的比力学性能。
The chemical and mechanical behaviours of saturated bentonite were experimentally and analytically investigated. A series of oedometer tests on saturated bentonite was conducted. By replacing the cell fluid during the oedometer test, one-dimensional osmotic consolidation and swelling behaviour were observed. The experimental results were simulated numerically using a constitutive model by considering the influence of electrochemical phenomena of clay mineral crystals on the macrostructural behaviour. It was concluded that the typical mechanical swellability of water-saturated bentonite in oedometer test is affected by a positive dilatancy behaviour due to the lower shear strength. After the osmotic consolidation test, a lateral contraction of the specimen in the oedometer was observed; this affected the compressibility during the subsequent mechanical consolidation. It was also concluded that the concentration of Na+ in the pore fluid affects the specific mechanical properties of bentonite.