格栅式地下连续墙竖向载荷模型试验研究

doi:10.13722/j.cnki.jrme.2014.0659

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Abstract As a new type of bridge foundation，the lattice shaped diaphragm wall(LSDW) provides a potential new solution to the problem of bridge foundation in soft soil for the construction of high-speed railways. In this paper，three LSDW foundation models with one，two and four chambers respectively were studied using an indoor test model having a similarity ratio of 1∶30. It was found that the Q-s curves of all three LSDWs show the characteristics of gentle variation in settlement，and the ultimate bearing capacity of LSDWs increases non-linearly with the growth of material consumption and the number of chambers. The outer skin friction is related to soil properties and the relative displacement between the wall and the soil. The inner skin friction arises from the bottom of the wall，extending up to 1/4 of its depth and showing an“L”shaped distribution. Its influence on the bearing capacity becomes more significant as the lattice size increases. The direct soil resistance to the LSDW foundation is relatively small and its contribution to the ultimate bearing capacity of the foundation can be ignored. During the loading process，all three LSDW foundations show the change from an end-surface bearing to a friction bearing dominant wall. At the same depth and wall thickness，adopting fewer chambers in the LSDW foundation，compared with using a larger chamber size，is more effective at weakening the combined effect of wall groups and achieving a better bearing performance of the foundation.

Key words： foundation engineering lattice shaped diaphragm wall skin friction soft soil vertical bearing capacity soil core effect of wall groups

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.0659 OR http://www.rockmech.org/EN/Y2015/V34/I12/2580

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