CFS桩复合地基承载特性的现场试验研究  

Bearing characteristics of CFS pile composite foundation

作　　者：张彬[1] 王钊[1] 王俊奇[1] 蒋文凯[1] 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《哈尔滨工业大学学报》2004年第1期63-68,共6页Journal of Harbin Institute of Technology

基　　金：高等学校博士学科点专项科研基金(1999000336)

摘　　要：为进一步了解水泥粉煤灰钢渣桩(CFS)桩的加固机理,通过现场静载荷试验,研究了复合地基桩土应力比(荷载分担比)随荷载的变化规律,分析了置换率对桩土应力比的影响。采用大面积现场堆放钢坯的方式,模拟运行期间CFS桩复合地基的承载性状,研究了堆载作用下基底的沉降、地基土体深层水平位移、地基土体竖向附加应力分布、临近桩体水平位移及桩前(后)附加应力变化规律;探讨了堆载作用下,CFS桩复合地基-临近桩体的共同作用机理。为完善该复合地基设计理论提供了参考。The variation, relevant to the variation of the load, of pile-soil stress ratio (pile-soil bearing load ratio) is studied through field loading test, and at the same time, the influence of pile-soil stress ratio on replacement ratio is also analyzed. Moreover, by piling up steel blanks to simulate the bearing properties of CFS pile composite foundation during service, some bearing characteristics are studied, including the settlement of foundation base, the deep horizontal displacement, the distribution of vertical additional stress of composite foundation, horizontal displacement of adjacent pile and the variation rhythm of lateral pile additional stress. In addition, the interaction mechanism of CFS pile composite foundation-adjacent pile during superficial surcharge is discussed.

关 键 词：CFS桩 复合地基 承载特性 粘结强度 粉煤灰钢渣桩 力学性能 地基设计 

分 类 号：TU473.12[建筑科学—结构工程]