超長水泥土攪拌樁的荷載傳遞特性
何開勝 徐立新
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何開勝 （南京水利科學(xué)研究院 210024）徐立新 （安徽省港航勘測設(shè)計院 合肥 230011）
[提要] 大型構(gòu)筑物實體下超長水泥土攪拌樁的樁身應(yīng)力和變形觀測結(jié)果表明，對樁身質(zhì)量良好的水泥土樁，在長期荷載作用下呈現(xiàn)出接近剛性摩擦樁的荷載傳遞特性和較高的樁土應(yīng)力比，并且，只要樁身中下部水泥土強(qiáng)度有保證，群樁中樁身軸力的有效傳遞深度可達(dá)25m以上。
[關(guān)鍵詞] 水泥土攪拌樁 荷載傳遞特性 樁土應(yīng)力比On the basis of the stress and deformation observation of instrumented deep mixing piles (27m) under prototype building, a high axial stress and a high stress ratio of pile to soil occur, and load transfer behavior of piles like the friction piles for well-constructed piles under long-term loads. The depth of load transfer can reach 25m and more if the strength of cement-soil in the pile shaft is sufficient.
Keywords: cement deep mixing pile; load transfer behavior; stress ratio; pile; soil
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