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| Microstructure and structural character of soil aggregates in triggering area of Jiangjiagou torrent stream,Yunnan Province |
| Wang Zhibing,Wang Ren,Zheng Yun,Lü Shizhan |
| State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,430071,Wuhan,China |
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Abstract There are widely distributed soil aggregates in triggering area of debris flow from Jiangjiagou torrent stream,Yunnan Province.The soil aggregate is a strongly structured special soil,with high void ratio,low liquid limit and very high dispersibility.The environmental scanning electron microscope(ESEM) images show that there are three types of pore in soil aggregates.Obvious dissolution along pore space and void structure between soil particles also commonly exist in soil aggregate.In order to apply the comprehensive structure potential parameter of the stress,compression tests are conducted respectively on intact,saturated and remoulded state soil aggregate.The descending velocity of the structural parameter curve is higher at the stage of lower stresses,but the curve become more gentle at the stage of higher stresses.The soil aggregates exhibit great collapsibility and unstable structure.The results indicate that the microstructure and structural character play an important role in the stability of soil aggregates.
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Received: 14 September 2010
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