A case of the formation of underground cavities in loose silty sand deposits |
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| Affiliation: | 1. IRPI, National Research Council, Bari, Italy;2. Università degli Studi di Bari “Aldo Moro”, IRPI, National Research Council, Italy;3. Università degli Studi di Palermo, Italy;1. Department of Marine Environment and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan;2. Department of Civil engineering, National Chiao Tung University, Hsinchu, Taiwan;3. Department of Urban Planning and Landscape, National Quemoy University, Kinmen, Taiwan;4. Department of Civil Engineering, National Central University, Zhongli, Taiwan |
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| Abstract: | A case of the formation of underground cavities to depths of some metres in loose sandy Quaternary sediments is described and the factors controlling their appearance and evolution are discussed. Special attention is given to the role of underground erosion, through the circulation of water, and to the importance of grain-size analysis of the sandy soil, as well as to the presence of slightly differentiated soil material (silty sand or clayey sand) distinguished in thin intercalations. This material, with only slightly increased cohesion, has the function of a roofing material in the mechanism of cavity formation. |
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