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(東南大學(xué)交通學(xué)院，南京 210096)

［摘要］根據(jù)某高速公路橋梁工程PHC管樁施工過程中的實(shí)測(cè)結(jié)果，利用各測(cè)點(diǎn)產(chǎn)生的超孔壓消散曲線，結(jié)合孔壓計(jì)埋設(shè)圖，分析了超孔隙水壓力的大小、分布、變化規(guī)律及影響范圍，得出以下結(jié)論：1)隨著入土深度的增大，孔隙水壓力均有開始減小然后增大的過程；2)測(cè)點(diǎn)距離沉樁越近，孔隙水壓力影響越大,且孔隙水壓力數(shù)值變化越明顯；3)位于深層的超孔隙水壓力隨著有效半徑的減小明顯增大。提出了減弱超孔隙水壓力的措施。

［關(guān)鍵詞］PHC樁；高速公路橋梁工程；超孔隙水壓力；措施

Analysis on excess pore water pressure caused by installing PHC in expressway bridge

 Zhang Henian，Liu Songyu，Ji Peng

 (Transportation College of SEU, Nanjing 210096, China)

Abstract:According to the results measured during construction of PHC pile in an expressway bridge engineering, the magnitude, distribution, the changing regularity and effect range of the excess pore water pressure are discussed. Some conclusions are got: with the depth increasing, pore water pressure reduces at first, and then increases；with the effective radius getting smaller, pore water pressure affects greater, and the change of the pore water pressure is more obvious；the pore water pressure in deeper layer increases more obviously with the reduction of the effective radius. Some measures are put forward in order to eliminate the effect of pore water pressure.

Keywords:PHC pile; expressway bridge engineering; excess pore water pressure; measure

*江蘇省交通科學(xué)研究計(jì)劃項(xiàng)目(05Y44)。