基于自平衡法的泥岩地基中大型灌注桩的承载特性分析  

Analysis on bearing behaviour of large-scale cast-in-place pile in foundation with self-balanced method

作　　者：罗耀武[1] 佴磊[1] 

机构地区：[1]吉林大学建设工程学院,吉林长春130026

出　　处：《世界地质》2005年第4期382-387,共6页World Geology

基　　金：吉林省交通厅科研项目(2003-01-13)

摘　　要：采用自平衡试桩法对龙华寺松花江特大桥1号墩的大型钻孔灌注桩进行了试验研究,得出单桩竖向抗压极限承载力>53102kN,泥岩地层极限侧阻力可达336kPa。对两根试桩Q-S曲线、桩侧土层位移-摩阻力曲线、桩端荷载-桩端位移曲线及试桩受力-桩端阻力曲线形态和数值进行对比分析,发现成孔时间长,泥浆比重大,孔壁泥皮厚,会导致桩侧摩阻力降低,且侧阻力发挥所需的桩土间相对位移增大。The self-balanced method was applied to study the bearing behavior of two large-scale cast-in-place piles in 1^# pier of Longhua Temple-Songhua River Bridge, the ultimate bearing capacity of single pile is greater than that of 53 102 kN. The ultimate side friction ofmudstone can reach 336 kPa. Contrast analysis is presented based on the shape and numerical value of the Q-S curve, the soil displacement-frictional resistance curve, the load of pile end-the displacement of pile end curve and the load of pile-the load of pile end curve of the two test piles. The conclusion is presented： the longer the pore forming and the bigger the specific weight of mud fluid is, the thicker the mud is. It can reduce the side friction of pile and increase the relative displacement between pile and soil which is needed by the exertion of side friction.

关 键 词：自平衡法 泥岩地基 灌注桩 承载特性 

分 类 号：TU447[建筑科学—岩土工程]