A comparison between the behaviour of swelling and of collapsing soils |
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| Institution: | 1. Xi''an Jiaotong University, Xi''an, China;2. University College London, United Kingdom;3. Key Laboratory for Geo-hazard in Loess Area, Ministry of Land and Resources, Xi''an Center of China Geological Survey, Xi''an 710054, China.;1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, China;3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | In recent years there has arisen an increasing awareness of the existence of structurally metastable soils that change in bulk volume when water is applied to them. Swelling or expansive clays increase in volume, while loessial collapsing soils decrease in volume when theirmoisture content increases under constant applied stress.Documented evidence of the existence of and difficult engineering problems associated with expansive clays and loessial soils is world-wide.The present paper is aimed at summarizing and comparing the physico- mechanical properties of these structurally metastable soils with a special reference to Romanian expansive and loessial soils.Emphasis is placed on the following problems: (1) mechanisms of swelling and collapsing processes and influencing factors; (2) identification and classification of structurally metastable soils; (3) quantification of the amount of heave or subsidence that may occur; (4) rheological aspects of swelling and collapsing. |
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