Penetration Resistance of Skirt-Tip with Rough Base for Suction Caissons in Clay
Penetration Resistance of Skirt-Tip with Rough Base for Suction Caissons in Clay
复制标题
粘土吸力沉箱裙尖粗糙底座的贯入阻力
DOI：
10.1007/s13344-020-0071-z
复制
发表时间：
2020-12
影响因子：
1.6
通讯作者：
Yang Qing
中科院分区：
文献类型：
--
作者：
Wu Yuqi;Li Dayong;Yang Qing
吸入式沉箱在自重和吸力的共同作用下，可以很容易地穿透到海床中，这些自重和吸力是由越来越多的抽水产生的。在吸力辅助贯入过程中，由于所施加的吸力降低了土塞内部的垂直应力，所以沉井外部裙尖水平的等效覆盖层一般比沉井内部的等效覆盖层高。这可能会导致在裙尖底部产生均匀的剪应力，因为裙尖下方的土壤倾向于进入沉井，从而导致裙尖底部下方存在不对称的破坏楔形。此外，沿裙壁内侧(αi)和外侧(αo)方向的不同粘结系数会导致沉箱内外塑性区不对称。因此，本文提出了一种非对称破坏机制来计算裙尖的侵彻阻力。提出的破坏机理首次考虑了不同粘结系数(αi)和(αo)对裙尖破坏机理的影响，并考虑了裙尖水平沉箱内外等效超载的加权平均贡献。所需的吸力压力可以通过沉箱在垂直方向上的力平衡来获得。最后，通过有限元计算验证了裙尖处的非对称破坏机理。通过与实测值的比较，发现所需吸气压力的预测值与实验值吻合较好。
Suction caissons can readily penetrate into the seabed under the combination of the self-weight and suction resulted from the encased water being increasingly pumped out. During suction-assisted penetration, the equivalent overburden at the skirt-tip level outside the caisson is generally higher than that inside because the vertical stress within the soil plug is reduced by the exerted suction. This may result in a uniform shear stress developing over the base of the skirt-tip as the soil below the skirt-tip tends to move into the caisson, which leads to an asymmetric failure wedge existing below the base of the skirt-tip. Besides, different adhesion factors along the inside (αi) and outside (αo) of the skirt wall will cause asymmetric plastic zones inside and outside the caisson. Accordingly, an asymmetric failure mechanism is therefore proposed to calculate the penetration resistance of the skirt-tip. The proposed failure mechanism is the first to consider the effect of different adhesion factors (αi) and (αo) on the failure mechanism at the skirt-tip, and involves the contribution from the weighted average of equivalent overburdens inside and outside caisson at the skirt-tip level. The required suction pressure can be obtained in terms of force equilibrium of the caisson in a vertical direction. Finally, the asymmetric failure mechanism at the skirt-tip is validated with the FE calculations. By comparing with the measured data, the predictions of the required suction pressure are found to be in good agreement with the experimental results.
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DOI：
10.1007/s12205-017-1469-x
发表时间：
2018-08
期刊：
KSCE Journal of Civil Engineering, Published online
影响因子：
--
作者：
Wu Yuqi;Li Dayong;Zhang Yukun;Chen Fuquan
通讯作者：
Chen Fuquan
DOI：
10.4043/12195-ms
发表时间：
2000
期刊：
--
影响因子：
--
作者：
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通讯作者：
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影响因子：
5
作者：
Puyang Zhang;Yaohua Guo;Yonggang Liu;H. Ding
通讯作者：
Puyang Zhang;Yaohua Guo;Yonggang Liu;H. Ding
影响因子：
5.8
作者：
G. Houlsby;R. Kelly;J. Huxtable;B. Byrne
通讯作者：
G. Houlsby;R. Kelly;J. Huxtable;B. Byrne
DOI：
10.1016/0148-9062(74)91688-x
发表时间：
1973-12
期刊：
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts
影响因子：
--
作者：
E. Davis;J. Booker
通讯作者：
E. Davis;J. Booker