Stability of long trench in soft soils by bentonite-water slurry
来源期刊：中南大学学报(英文版)2014年第9期
论文作者：ZHUO Hong-chun(卓弘春) YANG Yu-you(杨宇友) ZHANG Zi-xin(张子新) PAN Chun-hui(潘春晖) DUAN Chuang-feng(段创峰)
文章页码：3674 - 3681
Key words：slurry trench; soft clay; stability; centrifuge model test
Abstract: A series of centrifuge model tests exploring the effects of different types of slurry on long-trench stability in soft clay were conducted. The influence of groundwater conditions relative to trench stability was examined by constructing long trenches using different slurries. The soil deformation and surface settlement induced by the excavation of the trench are found to be closely related to slurry type and excavation depth of the long trench. Increasing the bentonite concentration of the slurry has beneficial effects on stability: 1) larger particles can improve local and global stability in cases where filter cakes do not form, and 2) larger viscosity can promote filter cake formation on the walls of long trenches excavated in soft clay and enhance their stability.
ZHUO Hong-chun(卓弘春)1, YANG Yu-you(杨宇友)1, ZHANG Zi-xin(张子新)2, PAN Chun-hui(潘春晖)2, DUAN Chuang-feng(段创峰)3
(1. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China;
2. Department of Geotechnical Engineering, School of Civil Engineering, Tongji University, Shanghai 200092, China;
3. Shanghai Urban Construction (Group) Corporation, Shanghai 200023, China)
Abstract:A series of centrifuge model tests exploring the effects of different types of slurry on long-trench stability in soft clay were conducted. The influence of groundwater conditions relative to trench stability was examined by constructing long trenches using different slurries. The soil deformation and surface settlement induced by the excavation of the trench are found to be closely related to slurry type and excavation depth of the long trench. Increasing the bentonite concentration of the slurry has beneficial effects on stability: 1) larger particles can improve local and global stability in cases where filter cakes do not form, and 2) larger viscosity can promote filter cake formation on the walls of long trenches excavated in soft clay and enhance their stability.
Key words:slurry trench; soft clay; stability; centrifuge model test
