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（東洋工程（上海）有限公司，上海200122）

[摘要]  從壓樁力出發(fā)，對(duì)軟土地區(qū)的壓樁力公式進(jìn)行了深入研究。發(fā)現(xiàn)單樁豎向極限承載力試驗(yàn)值通常比理論計(jì)算值提高較多，考慮時(shí)間效應(yīng)下將會(huì)給基礎(chǔ)結(jié)構(gòu)設(shè)計(jì)帶來較大的經(jīng)濟(jì)效益。通過擬合回歸分析，獲得了考慮時(shí)間效應(yīng)下單樁承載力的預(yù)測(cè)公式，實(shí)現(xiàn)了對(duì)任意時(shí)刻單樁承載力的預(yù)測(cè)。經(jīng)試驗(yàn)驗(yàn)證，該公式預(yù)測(cè)值與試驗(yàn)值誤差較小，可在工程實(shí)踐中參考使用。預(yù)測(cè)計(jì)算及試驗(yàn)結(jié)果均表明，單樁的最終極限承載力隨休止時(shí)間的延長而增大，前期增長較快，后期較為緩慢，兩年后的單樁豎向承載力幾乎不再增長。

[關(guān)鍵詞]  時(shí)間效應(yīng)；壓樁力；軟土；豎向極限承載力；預(yù)測(cè)公式

中圖分類號(hào)： TU473   文獻(xiàn)標(biāo)識(shí)碼：A        文章編號(hào)：

作者簡(jiǎn)介：碩士,工程師,Email:mgmz@21cn.com。

Forecasting and testing study on time effect of vertical bearing capacity for single pile

YAO Mingfu

（Toyo Engineering (china) Co.,Ltd, Shanghai,200122,China）

Abstract: Based on the force of pressed pile, it was that had studied in-depth the formula of  force  of  pressed pile. The test was found that the value of ultimate bearing capacity for single pile increased more than the theoretical. Infrastructural design would bring greater economic benefit on time effect. A forecasting formula on time effect for the ultimate bearing capacity of single pile was obtained by regression analysis. Prediction of bearing capacity of single pile was achieved about any time. The limit of error was smaller both forecasting formula value and testing value. The predictable data were shown that the proposed method was feasible. Prediction data and test results were found that the ultimate bearing capacity of single pile added as time rising, with fast in the early stage and slow in the late. Vertical bearing capacity was no longer grow two years later.

Keywords: time effect; pressed pile; soft soil; vertical limited bear capacity; forecasting formula

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