Simulation of a corner slurry trench failure in clay |
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| Institution: | 1. Faculty of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;2. Faculty of Arts and Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;3. PRESTO JST, 5 Sanban-cho, Chiyoda-ku, Tokyo 102-0075, Japan;4. National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-city, Gifu 509-5292, Japan;1. Charles University, Prague, Czech Republic;2. Silesian University of Technology, Gliwice, Poland;3. Zhejiang University, Hangzhou, China;1. Seazen Holdings Co., Ltd. Shanghai Second Branch, Shanghai 201800, China;2. Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai 201804, China;3. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Cao An highway.4800, 201804 Shanghai, China;4. Department of Civil Engineering, McMaster University, Main Street West.1280, L8S4L7 Hamilton, Canada |
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| Abstract: | Some analytical methods have been proposed for the computation of the stability of plane open trenches supported by bentonite slurry. Nevertheless, there is no validated analytical method for the case of non-plane trenches which are required as stiff watertight corners in excavation pits. Simplified approaches replace the geometry of the corner (non-plane) trench by an equivalent plane trench. In this work it is shown, that some of these approaches are not adequate, as they oversimplify the geometry of the sliding body in the limit state and may overestimate the factor of safety against failure. Using a 3D finite element model it was possible to identify the geometry of the sliding body by simulating the stepwise excavation process of a corner trench in normal consolidated clay and its failure due to the reduction of bentonite support. The influence of the geometry of the trench, drainage conditions, material properties and anisotropy of the soil has been considered. In contrast to the simplified sliding body with the shape of a wedge on which analytical methods are based, the sliding body observed in the simulations has the shape of a quarter of a vertical cylinder, intersected by an inclined plane at its bottom. |
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