豎向荷載下新型帶肋預應力管樁數(shù)值模擬研究
熊厚仁1,2，蔣元海1，牛志榮1，楊建永2，周兆弟3
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(1 嘉興學院建筑工程學院，嘉興 314001； 2 江西理工大學建筑與測繪工程學院， 贛州 341000；3 浙江天海管樁有限公司，杭州 310000)［摘要］現(xiàn)場單樁靜載荷試驗結(jié)果表明，新型帶肋預應力管樁具有較高的承載力,特別是在沿海的粉砂土地區(qū)具有很大的優(yōu)越性。基于靜載試驗結(jié)果,采用MIDAS/GTS有限元軟件，分析了各級荷載工況下新型帶肋預應力管樁的應力場和位移場變化規(guī)律。模擬結(jié)果表明，該類管樁對周邊土產(chǎn)生一個與環(huán)狀凸肋大小相當?shù)膱A筒剪切面，在環(huán)狀凸肋處軸應力變化明顯，環(huán)狀凸肋能有效起到端阻力的作用，對鄰近的下部土體產(chǎn)生一個附加應力作用。［關(guān)鍵詞］新型帶肋預應力管樁；承載力；MIDAS/GTS；環(huán)狀凸肋；附加應力Numerical analysis on a new-type prestressed pipe-pile with rib under vertical loadXiong Houren1,2, Jiang Yuanhai1, Niu Zhirong1, Yang Jianyong2, Zhou Zhaodi3(1 College of Civil Engineering & Architecture， Jiaxing University， Jiaxing 314001， China; 2 College of Architectural and Mapping Engineering， Jiangxi University of Science and Technology， Ganzhou 341000, China;3 Zhejiang Tianhai Pipe Pile Co., Ltd., Hangzhou 310000， China)Abstract:The static loading test results show that the new-type prestressed pipe-pile with rib has high bearing capacity, and this type of pipe-pile is selected with significant advantage especially in silt soil. Based on the static load test results, the stress and displacement fields of the new-type prestressed pipe-pile with rib were analyzed by MIDAS/GTS at different load case levels. The simulation results show that this type of pipe-pile to peripheral soil has a cylinder shear in the form of surface damage, which is the same size as the annular flange rib, the axial stress changes obviously in the annular flange rib. The annular flange rib can effectively play the role of the end resistance, and has an additional stress to the neighbor lower part soil.Keywords:new-type prestressed pipe-pile with rib; bearing capacity; MIDAS/GTS; annular flange rib; additional stress*建設部科學技術(shù)項目(2008-k1-18)，江西省研究生創(chuàng)新資金資助項目(YC08A079)。作者簡介: 熊厚仁，碩士，助教，Email：104072005@163.com。參考文獻［1］ OGURA H,YAMAGATA K,KISHIDA H.Study on bearing capacity of nodular cylinder pile by scaled model test ［J］.Journal of Structural and Construction Engineering(Transactions of AIJ),1987,374:87-97.［2］ OGURA H,YAMAGATA K,OHSUGI F.Study on bearing capacity of nodular cylinder pile by full-scale test of jacked piles［J］.Journal of Structural and Construction Engineering(Transactions of AIJ),1988,386:66-77.［3］ OGURA H,YAMAGATA K A. A theoretical analysis on load-settlement behavior of nodular piles［J］.Journal of Structural and Construction Engineering(Transactions of AIJ),1988,393:152-164.［4］ IWASAKI Y, NAGAYA J, YAO S. Laboratory test of bearing capacity of model pile with nodes［C］//Benedetto DI, eds. Deformation Characteristics of Geomateriais.Lisse: Swets & Zeitlinger, 2003:825-831.［5］ YABUUCHI S, NISHIWAKI A, KOBAYASHI K,et al. Bearing capacity of bored pile packed with iron and steel slag using precast concrete pile［C］//Van Impe, eds. Deep Foundation on Bored and Auger Piles: Rotterdam, 2003:275-284.［6］ 史玉良.預制節(jié)樁的荷載試驗及荷載傳遞性能分析［J］.工業(yè)建筑,1993，23(7)：3-9.［7］ 蔣元海.先張法預應力混凝土異形管樁:中國，ZL 02286204［P］.2004-04-14.［8］ 黃敏，龔曉南.帶翼板預應力管樁承載性能的模擬分析［J］.巖土工程學報,2005,38(2):102-105.［9］ 黃敏,龔曉南.一種帶翼板預應力管樁及其性能初步研究［J］.巖土工程學報,2005,38(5):59-62.［10］ 熊厚仁, 牛志榮，蔣元海，等. 新型帶肋預應力管樁承載特性試驗研究［J］.混凝土與水泥制品,2009(2):32-35.
