南宁盆地特殊地层静压随钻跟管桩承载特性现场试验及数值模拟研究  

In-situ test and Numerical Simulation Study on Bearing Characteristics of Drilling with PHC Pipe Cased Pile under Static Pressure in Special Stratum of Nanning Basin

作　　者：彭伍连 罗冲 韩伟 严利娥[3] 唐运民 张信贵[3] Peng Wulian;Luo Chong;Han Wei;Yan Lie;Tang yunmin;Zhang Xingui(Guangxi Geological Survey Institute of China Chemical Geology and Mine Bureau,Nanning,Guangxi,530000,China;Guangxi University Design Institute Co.,Ltd,Nanning,Guangxi,530000,China;Guangxi University,Nanning,Guangxi,530000,China)

机构地区：[1]中化地质矿山总局广西地质勘查院,广西南宁530000 [2]广西大学设计院有限公司,广西南宁530000 [3]广西大学,广西南宁530000

出　　处：《化工矿产地质》2024年第3期254-259,共6页Geology of Chemical Minerals

基　　金：广西高校中青年教师科研基础能力提升项目(编号:2022KY1162);中化地质矿山总局科技创新团队岩溶区新型桩基成套关键技术研究(编号:ZHTD202101)。

摘　　要：随钻跟管桩(简称DPC桩)是一种钻孔-沉桩-排土同步进行的无泥浆排放的节能环保型大直径新型非挤土PHC管桩。为探究随钻跟管桩在南宁盆地特殊地层的适应性及承载特性,开展了现场原位试验、数值模拟分析,分析了这种新桩型的承载性能优势、桩侧摩阻力分布特征、荷载传递特性。得出如下结论:原位静载试验中,各试验桩荷载-沉降曲线呈缓变型,且承载性能均满足设计要求,桩身回弹率较高,各试验桩仍具有较大的承载潜力;桩身轴力沿桩身近似呈线性递减,桩端荷载约占桩顶荷载的20%~30%,桩侧摩阻力分担了70%~80%的桩顶荷载;桩侧摩阻力沿桩身深度分布均表现出了两头小、中间大的规律,随着荷载增加,桩侧摩阻力逐渐下移。可见,该桩型在南宁盆地特殊地层具有良好的适应性。Drilling with Prestressed High Strength Concrete Pipe Cased Pile(short for DPC pile)is a new type of large diameter non-extruded soil PHC(Prestressed High Strength Concrete)pile without mud discharge,which is a kind of energy-saving and environmentally friendly pile with synchronized drilling-sinking-discharging process.In order to investigate the adaptability and bearing characteristics of DPC pile in the special stratum of Nanning Basin,the in-situ test and numerical simulation were carried out to analyze the advantages of the bearing performance,the distribution characteristics of the side friction resistance of piles,and the load transmission characteristics of this new type of pile.The conclusions are as follows:in the in-situ static load test,the loadsettlement curves of the test piles shows a slow-variation type,and the bearing performance meets the design requirements,and the rebound rate of the pile body is relatively high,so that the test piles still has great bearing potential,the axial force of the pile body shows a linear decrease along the pile body,and the load at the end of the pile accounted for about 20%-30%of the pile top load,while the side friction resistance of piles shares 70%-80%of the top load,the distribution of the side friction resistance along the depth of the pile body shows the law of small at both ends and large in the middle.With the increase of load,the side friction resistance of piles gradually moves downward.It can be seen that this pile type has good adaptability in the special stratum of Nanning Basin.

关 键 词：随钻跟管桩 圆砾 碎屑岩 承载特性 

分 类 号：TU473.1[建筑科学—结构工程]