(1 北京建工集团有限责任公司, 北京 100055; 2 河北省土木工程灾变控制与灾害应急重点实验室, 廊坊 065201; 3 华北科技学院建筑工程学院, 廊坊 065201)

摘要: 以北京工人体育场改造复建项目作为工程背景,分析了水泥土复合管桩在密实砂卵石地层中的工作性态,并给出了水泥土复合管桩在砂卵石地层中的加载试验与数值模拟结果对比. 采用 FLAC3D 软件模拟了水泥土复合管桩加载以及其与地层相互作用机理. 结合试验与模拟结果,分析了水泥土复合管桩的破坏机理. 结果表明,水泥土复合管桩在竖向荷载作用下的荷载-位移曲线模式是典型的摩擦桩工作模式,桩端阻力约占桩顶荷载的1 / 3;桩侧摩阻力荷载传递具有双层模式特点,即荷载由管桩先传递到管桩周围的水泥土桩,再由水泥土桩传递到桩间土中;水泥搅拌桩在砂卵石地层中可形成刚度大、强度高的水泥土外桩;管桩的压入有效提高了水泥土复合管桩的刚度,而水泥土外桩有效改善了桩土界面的摩擦接触效应,结合桩端砂卵石层,可有效提高水泥土复合管桩的承载力.

关键词: 北京工人体育场; 水泥土复合管桩; 预应力管桩; 砂卵石层; 桩身轴力; 桩侧阻力; 桩承载力

中图分类号:TU318+. 1 文献标志码:A 文章编号: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,硕士,高级工程师,主要从事大型公建项目建造及施工,Email:1710941523@ qq. com.

[引用本文] 李欣,王猛,万征,等. 北京工人体育场密实砂卵石层水泥土复合管桩试验研究[ J]. 建筑结构,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.