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        楊學(xué)林 施祖元  益德清
    （浙江省建筑設(shè)計(jì)研究院 杭州 310006）

[提要]  根據(jù)深基坑工程的施工特點(diǎn)，提出了考慮分步開挖影響的帶支護(hù)結(jié)構(gòu)的計(jì)算方法。討論了水平支撐體系的等效剛度、內(nèi)支撐與圍護(hù)墻的變形協(xié)調(diào)等問題。工程實(shí)例表明，在支護(hù)結(jié)構(gòu)計(jì)算中考慮分步開挖的影響后，內(nèi)力與變形計(jì)算結(jié)果與實(shí)測(cè)值較接近。
[關(guān)鍵詞]  深基坑 支護(hù)結(jié)構(gòu)  圍護(hù)墻 水平支撐 分步開挖

The multi-braced retaining structure has been widely applied to deep excavation engineering in soft clay. A calculation method for retaining structure considering the effects of steped excavation is presented, according to the construction characteristics of deep excavation engineering. Some problems are discussed, such as the mechanical mode and equivalent stiffness of hornontal bracing system, the deformation compatibility between the bracing and retaining wall. Finally, two excavation cases are given, which indicate that the effects of steped excavation can not be neglected in the calculation of the structure.
Keywords:  deep pit; retaining structure; steped excavation; horizontal bracing