桩底灌浆在大口径桩基承载能力中的试验研究  

Pile Bottom Grouting in the Bearing Capacity of Large Diameter Pile Foundation Test Research

作　　者：袁媛[1] YUAN Yuan(Zhengzhou Railway Vocational & Technical College,Zhengzhou Henan 450000)

机构地区：[1]郑州铁路职业技术学院

出　　处：《河南科技》2019年第7期128-131,共4页Henan Science and Technology

摘　　要：本文以某高铁兴建工程某标中的2个大孔径反循环钻孔灌注桩为研究对象,分别以单阶段及多阶段的施工方法,采用套管桩底浇筑的方式,利用极限承载力判断方法推估桩基的极限承载力,以研究桩基承受垂直载重后的应力传递行为及桩底土壤受力行为,评估不同桩底灌浆方法对桩基承载力、桩头沉陷状况以及桩内钢筋的应力变化等项目的改善程度,以判断桩底灌浆对增加垂直承载力的成效。Taking two large bored piles with reverse circulation in a bid of a high-speed railway construction project as the research object, the ultimate bearing capacity of pile foundation was estimated by using the method of casing pile bottom pouring and ultimate bearing capacity judgment. The stress transfer behavior of pile foundation after bearing vertical load and the stress behavior of soil at pile bottom were studied, and the improvement degree of different pile bottom grouting methods on pile foundation bearing capacity, pile head subsidence and stress change of steel bar in pile was evaluated, and the effect of pile bottom grouting on increasing vertical bearing capacity was judged.

关 键 词：大口径 桩基 反循环钻孔灌注桩 桩底灌浆 全套管灌注桩 

分 类 号：TU753.3[建筑科学—建筑技术科学]