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(1 北京建工集團(tuán)有限責(zé)任公司, 北京 100055; 2 河北省土木工程災(zāi)變控制與災(zāi)害應(yīng)急重點(diǎn)實(shí)驗(yàn)室, 廊坊 065201; 3 華北科技學(xué)院建筑工程學(xué)院, 廊坊 065201)

摘要: 以北京工人體育場改造復(fù)建項(xiàng)目作為工程背景,分析了水泥土復(fù)合管樁在密實(shí)砂卵石地層中的工作性態(tài),并給出了水泥土復(fù)合管樁在砂卵石地層中的加載試驗(yàn)與數(shù)值模擬結(jié)果對(duì)比. 采用 FLAC3D 軟件模擬了水泥土復(fù)合管樁加載以及其與地層相互作用機(jī)理. 結(jié)合試驗(yàn)與模擬結(jié)果,分析了水泥土復(fù)合管樁的破壞機(jī)理. 結(jié)果表明,水泥土復(fù)合管樁在豎向荷載作用下的荷載-位移曲線模式是典型的摩擦樁工作模式,樁端阻力約占樁頂荷載的1 / 3;樁側(cè)摩阻力荷載傳遞具有雙層模式特點(diǎn),即荷載由管樁先傳遞到管樁周圍的水泥土樁,再由水泥土樁傳遞到樁間土中;水泥攪拌樁在砂卵石地層中可形成剛度大、強(qiáng)度高的水泥土外樁;管樁的壓入有效提高了水泥土復(fù)合管樁的剛度,而水泥土外樁有效改善了樁土界面的摩擦接觸效應(yīng),結(jié)合樁端砂卵石層,可有效提高水泥土復(fù)合管樁的承載力.

關(guān)鍵詞: 北京工人體育場; 水泥土復(fù)合管樁; 預(yù)應(yīng)力管樁; 砂卵石層; 樁身軸力; 樁側(cè)阻力; 樁承載力

中圖分類號(hào):TU318+. 1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)06-0053-06

DOI:10. 19701 / j. jzjg. ZJ220107

Experimental study on cement-soil composite pipe pile in dense sand pebble layer of Beijing Workers Stadium

LI Xin1, WANG Meng1, WAN Zheng2,3, GUO Yaxing1

(1 Beijing Construction Engineering Group Co. , Ltd. , Beijing 100055, China; 2 Hebei Key Laboratory of Civil EngineeringCatastrophe Control and Disaster Emergency Response, Langfang 065201, China; 3 Architectural Engineering College,North China Institute of Science and Technology, Langfang 065201, China)

Abstract: Based on the Beijing Workers Stadium reconstruction project as an engineering background, the working state ofcement-soil composite pipe pile in dense sand pebble formation layer was analyzed, and the comparison between the loadingtest and numerical simulation results of cement-soil composite pipe pile in sand pebble layer was given. FLAC3D softwarewas used to simulate the loading of cement-soil composite pipe pile and its interaction mechanism with stratum. Combinedwith the test and simulation results, the failure mechanism of cement-soil composite pipe pile was analyzed. The resultsshow that the load-displacement curve mode of cement-soil composite pipe pile under vertical load is a typical working modeof friction pile, and pile tip resistance accounts for about 1 / 3 of pile top load. Pile side friction load transfer ischaracterized by a double-layer mode, that is, the load is first transferred from the pipe pile to the cement-soil pile aroundthe pipe pile and then from the cement-soil pile to the soil between the piles. Cement mixing pile can form cement-soil pilewith high stiffness and strength in sand pebble layer. The stiffness of soil-cement composite pipe pile is improved effectivelyby pressing pipe pile, and the cement-soil external pile can effectively improve the friction and contact effect of pile-soilinterface, which can effectively improve the bearing capacity of cement-soil composite pipe pile when combined with thesand pebble layer at the pile end.

Keywords:Beijing Workers Stadium; cement-soil composite pipe pile; prestressed pipe pile; sand pebble layer; axialforce of pile body; lateral pile resistance; bearing capacity of pile

第一作者:李欣,碩士,高級(jí)工程師,主要從事大型公建項(xiàng)目建造及施工,Email:1710941523@ qq. com.

[引用本文] 李欣,王猛,萬征,等. 北京工人體育場密實(shí)砂卵石層水泥土復(fù)合管樁試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2023,53(6):53-58. LI Xin,WANG Meng,WAN Zheng,et al. Experimental study on cement-soil composite pipe pile in densesand pebble layer of Beijing Workers Stadium[J]. Building Structure,2023,53(6):53-58.