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        張繼紅  王國(guó)體
       (合肥工業(yè)大學(xué)土木工程系 合肥 230009)

[提要]  提出通過附加應(yīng)力計(jì)算基坑支護(hù)問題，給出了土體中的靜力反算關(guān)系式，考慮開挖前原位土體中應(yīng)力作用以及地面堆載、基底開挖卸載的影響，建立平面有限元法及土抗力法計(jì)算的靜力反算荷載模式。結(jié)合實(shí)例計(jì)算，說明方法可供實(shí)踐參考應(yīng)用。
[關(guān)鍵詞]  附加應(yīng)力  原位土中應(yīng)力  基坑支護(hù) 荷載模式 有限元法 土抗力法

Authors introduce how to use additional pressure for retaining structures calculation in excavation. A formula is given to reflect the relationship among actual stress, origin stress and additional pressure in earth during excavation. With reference to the origin stress insoil, surface load and unloading effects on the base of foundation, two load distribution models are introduced for finite-elenent method and subgrate reaction method. The application of the models is demonstrated via a study of two published historical cases. It is found that the model is applicable for engineering practice.
Keywords: additional pressure;origin stress; retaining structures;load distribution model; finite-element method; subgrade reaction method.