884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（1 成都理工大學(xué)環(huán)境與土木工程學(xué)院，成都 610059；2 溫州大學(xué)建筑與土木工程學(xué)院，溫州 325035； 3 東南大學(xué)巖土工程研究所，南京 210096）
［摘要］軟土地基中預(yù)制樁施工往往會(huì)產(chǎn)生較大的孔隙水壓力。分析了海相軟土中預(yù)應(yīng)力薄壁管樁采用錘擊沉入法施工產(chǎn)生超孔隙水壓力的變化規(guī)律。通過(guò)對(duì)單樁沉樁過(guò)程中孔隙水壓力的觀測(cè)，得出以下結(jié)論：?jiǎn)螛妒┕ひ鸬目讐涸诔跗谙⑤^快，其后逐漸緩慢；引起的最大孔壓接近于上覆有效土壓力的1.5倍。最后提出了控制和減小孔隙水壓力的施工措施。
［關(guān)鍵詞］孔隙水壓力；預(yù)應(yīng)力薄壁管樁；軟土；消散
Field test on pore water pressure induced by PTC pile installation in soft ground
Du Guangyin1，3，Yu Chuang2，Liu Songyu3 (1 Environment and Civil Engineering College, Chengdu University of Technology, Chengdu 610059, China； 2 College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, China； 3 Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China)
Abstract:Precast pile installation induces the excess pore water pressure in soft ground. The prestressed tubular concrete pile (PTC pile) installation using hammering method causes the increase in excess pore water pressure of surrounding clays in soft ground. The following results are obtained by filed test. The excess pore water pressure increases with time during pile installation and dissipates with time after installation. The dissipation time of excess pore pressure varies with the time and the distance from the pile. The dissipation rate initially is larger than later. The longer the dissipation time, the closer the distance is. And the maximum excess pore water pressure is nearly 1.5 times of the effective overburden stress in ground soils. In the end, the measure controlling the excess pore water pressure pile installation is presented.
Keywords:pore water pressure; PTC pile; soft ground; dissipation
*國(guó)家自然科學(xué)基金資助項(xiàng)目(40702047)。
作者簡(jiǎn)介：杜廣印，博士研究生，副教授，Email:guangyin@seu.edu.cn。
參考文獻(xiàn)
［1］史佩棟，等.實(shí)用樁基工程手冊(cè)［M］. 北京:中國(guó)建筑工業(yè)出版社, 1999.
［2］POLOS H G, DAVIS E H. Pile Foundation Analysis and Design［M］. John Wiley and Sons, New York,1980.
［3］唐世棟,何連聲,傅縱.軟土地基中單樁施工引起的超孔隙水壓力［J］.巖土力學(xué),2002,23(6):725-729,732.
［4］姚笑青,胡中雄.飽和軟土中沉樁引起的孔隙水壓力的估算［J］.巖土力學(xué),1997,18(4):30-35.
［5］王偉,宰金珉,王旭東.沉樁引起的超靜孔隙水壓力計(jì)算及其應(yīng)用［J］.巖土力學(xué),2004,25(5):774-777,797.
［6］雷金波,姜弘道，等. PTC管樁施工中孔隙水壓力規(guī)律分析與研究［J］.工業(yè)建筑,2005,35(6):56-60.
［7］余闖.路堤荷載下剛性樁復(fù)合地基理論與應(yīng)用研究［D］.南京：東南大學(xué),2006.