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(1 東北大學(xué)資源與土木工程學(xué)院，沈陽 110004； 2 沈陽建筑大學(xué)土木工程學(xué)院，沈陽 110168；3 遼寧省建筑設(shè)計研究院，沈陽 110005)

［摘要］通過對大量的現(xiàn)場試驗數(shù)據(jù)和觀測資料進行統(tǒng)計分析, 論述了墩式基礎(chǔ)的受力機理,指出了粘性土地基墩式基礎(chǔ)破壞模式不同于砂土地基的壓密式漸近破壞。 提出了持力層為粘性土?xí)r的單墩豎向承載力計算公式, 并分別給出了墩端土和墩周土的承載力調(diào)整系數(shù)。 根據(jù)對比試驗結(jié)果,墩底形狀為平底時對墩端土承載力的發(fā)揮最有利。 基礎(chǔ)底面尺寸效應(yīng)對墩式基礎(chǔ)的承載力有顯著影響, 隨著墩底直徑增大, 調(diào)整系數(shù)呈降冪指數(shù)規(guī)律衰減。

［關(guān)鍵詞］墩式基礎(chǔ)；粘性土地基；承載力；尺寸效應(yīng)；調(diào)整系數(shù)

Research on bearing capacity test of pier foundation on cohesive soil

Liu Zhongchang^1，3，Zhu Fusheng^1，2，Shu Zhaoran³，Yu Dan²

(1 School of Resources & Civil Eng. Northeast Univ., Shenyang 110004, China； 2 School of Civil Eng., Shenyang Jianzhu Univ., Shenyang 110168,China; 3 Building Design and Research Dep. of Liaoning Province, Shenyang 110005, China)

Abstract:The mechanism and an empirical formulation of vertical bearing capacity of non-reinforced concrete pier in cohesive soil are proposed based on field load testing data of piers. In the proposed formulation, the adjustment coefficient of both the end bearing and skin friction of the piers are given. The testing results show that a belled pier with flat end would have the largest end bearing capacity comparing with other end shape of belled piers. The results show that the size effect of end of belled pier has a significant influence on the bearing capacity of pier.

Keywords:pier foundation; cohesive soil; bearing capacity; scale effect; adjusting coefficient

遼寧省自然科學(xué)基金(20021008)，遼寧省科技攻關(guān)項目。