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(1 同濟(jì)大學(xué)地下建筑與工程系，上海 200092；2 同濟(jì)大學(xué)巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室 上海 200092)

［提要］以上海某工程超長(zhǎng)偏位PHC管樁豎向承載力分析為背景，采用有限元數(shù)值分析方法，同時(shí)考慮樁身結(jié)構(gòu)強(qiáng)度和土的強(qiáng)度，對(duì)該工程超長(zhǎng)PHC管樁由于水平偏位而對(duì)豎向承載力產(chǎn)生的影響進(jìn)行了計(jì)算分析。計(jì)算結(jié)果表明，存在一個(gè)臨界偏位值，當(dāng)樁頂偏位值大于該值時(shí)，該區(qū)域?yàn)榘礃渡順O限彎矩控制的計(jì)算區(qū)域；當(dāng)樁頂偏位值小于該值時(shí)，該區(qū)域?yàn)榘赐馏w強(qiáng)度控制的計(jì)算區(qū)域。樁基載荷試驗(yàn)結(jié)果證明，所采用的分析方法和計(jì)算結(jié)果是有效的，根據(jù)該計(jì)算方法可方便地繪制PHC管樁的豎向極限承載力和樁頂水平偏位的關(guān)系曲線。

［關(guān)鍵詞］超長(zhǎng)PHC管樁；偏位；極限彎矩；豎向承載力

Study on Vertical Bearing Capacity of Sloping Superlong PHC Pile Subjected to Lateral Soil Movements/Zhou Jian1，2, Zhang Zha1, Wang Lei1(1 Department of Geotechnical Engineering, 2 Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China)

Abstract:Based on the study of vertical bearing capacity of sloping super-long PHC pile, considering the strength of pile body and soil at the same time, the FEM was adopted to calculate the vertical bearing capacity of sloping super-long PHC pile subjected to lateral soil movements. The calculation results indicate that there is a critical sloping displacement. When the sloping displacement of pile head is greater than the critical value, the calculation area is controlled by the strength of soil, and when the sloping displacement of pile head is less than the critical value, the calculation area is controlled by the strength of pile body. The test results prove that the analytical method adopted is effective. Based on the analytical method, the relation curve of the vertical bearing capacity and sloping displacement of pile head can be drawn conveniently.

Keywords:super-long PHC pile; sloping displacement; critical moment; vertical bearing capacity

*國(guó)家自然科學(xué)基金資助項(xiàng)目(50578122)；河南省杰出青年基金資助項(xiàng)目。