水泥土支盘桩的抗拔机理及应用研究  

Study on the Uplift Mechanism and Application of Cement-soil Branch Pile

作　　者：姜宝良[1] 孙豫 王荣彦 Jiang Baoliang;Sun Yu;Wang Rongyan(North China University of Water Resources and Electric Power,Zhengzhou Henan 450000,China;The Second Geological Environment Investigation Institute of Henan Bureau of Geology and Mineral Exploration and Development,Zhengzhou Henan 450053,China)

机构地区：[1]华北水利水电大学,河南郑州450000 [2]河南省地质矿产勘查开发局第二地质环境调查院,河南郑州450053

出　　处：《铁道勘察》2019年第1期68-72,共5页Railway Investigation and Surveying

摘　　要：为了解决地下结构的抗浮问题,分析了国内多种抗拔措施,如"一压二拉"、降水等。阐述了水泥土支盘桩的结构组成、抗拔机理,对比分析了抗拔承载力的几种计算方法,并结合郑州东区某工程应用实例进行研究,研究结果表明:与混凝土灌注桩相比,水泥土支盘桩具有造价低、承载力高、施工速度快等显著优势,相同条件下,水泥土支盘桩每m可节约造价23%,承载力提高22%,施工工期缩短30%,建议推广使用。但在应用过程中还存在一些不足之处,如对影响桩抗拔性能的因素考虑还不够全面,使得桩的抗拔承载力未能充分发挥,需要进一步对桩身结构进行改进和优化,以确定合适的支盘直径、数量、间距等。In order to solve the anti-floating problem of underground structures,various domestic uplift measures,such as“one pressure and two pulls”and precipitation,areanalyzed.The structural composition and upliftmechanism of cement-soil branch piles are expounded.Several calculation methods of uplift bearing capacity are compared and analyzed.Combined with anengineeringapplication example in Zhengzhou East District,the research results show that compared with concrete cast-in-place piles,cement-soil branch piles have obvious advantages such as low cost,high bearing capacity and fast construction speed.Under the same conditions,the cement-soil branch piles can save 23%of the cost per meter,improve 22%of the bearing capacity and shorten 30%of the construction period,so it is recommended for promotion.However,there are still some shortcomings in the application process.For example,the factors affecting the upliftbehavior of the pile are not considered comprehensive enough,so that uplift bearing capacityof the pile is not fully exerted,and the pile structure needs to be further improved and optimized to determine the appropriate plate diameter,the plate number,and the plate spacing,etc.

关 键 词：水泥土支盘桩 抗拔机理 抗拔承载力 静载试验 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]