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Local Stability of Slurry Trench in Sandwiched Sand Layer with Confined Water Pressure
Diaphragm wall is commonly used as retaining structure in foundations of subway stations. The stability of slurry trench excavated during construction becomes a major concern. Field cases with the geology that a sand layer of low stability is sandwiched between two relatively stronger clays are often encountered. Because layers above and beneath are impermeable clays, confined water pressure may exist. The local stability in terms of this special geology needs to be carefully investigated. In this paper, the problem is foremost simplified to be modeled as a sand layer compressed between two rigid plates. Hyperbolic partial differential equations are established assuming the sand layer, which is rigid plastic conforming to Mohr-Coulomb yield criteria, is a limit state. The equations are then solved to obtain the theoretical solution of stress distribution on the trench surface so that a simplified formula to compute factor of safety of local stability is derived. Finally, a case history is presented and the validation of the formula is verified by numerical analysis. The method proposed by this paper successfully predicts the failure pattern of the trench face and can be applied in practice.
Local Stability of Slurry Trench in Sandwiched Sand Layer with Confined Water Pressure
Diaphragm wall is commonly used as retaining structure in foundations of subway stations. The stability of slurry trench excavated during construction becomes a major concern. Field cases with the geology that a sand layer of low stability is sandwiched between two relatively stronger clays are often encountered. Because layers above and beneath are impermeable clays, confined water pressure may exist. The local stability in terms of this special geology needs to be carefully investigated. In this paper, the problem is foremost simplified to be modeled as a sand layer compressed between two rigid plates. Hyperbolic partial differential equations are established assuming the sand layer, which is rigid plastic conforming to Mohr-Coulomb yield criteria, is a limit state. The equations are then solved to obtain the theoretical solution of stress distribution on the trench surface so that a simplified formula to compute factor of safety of local stability is derived. Finally, a case history is presented and the validation of the formula is verified by numerical analysis. The method proposed by this paper successfully predicts the failure pattern of the trench face and can be applied in practice.
Local Stability of Slurry Trench in Sandwiched Sand Layer with Confined Water Pressure
Shen, Chen (author) / Zhou, Shunhua (author)
Fourth International Conference on Transportation Engineering ; 2013 ; Chengdu, China
ICTE 2013 ; 2540-2548
2013-10-09
Conference paper
Electronic Resource
English
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