大直径灌注桩桩侧摩阻力试验研究.PDF

Vol.21　No.1 公　路　交　通　科　技 2004 1 JOURNAL OF HIGHWAY AND TRANSPORTATION RESEARCH AND DEVELOPMENT :1002-0268 (2004)01-0062-05 1 2 2 顾培英, 王德平, 吕惠明 (1., 　　21002 ;2., 　　215007) :根据苏州地区4 根大直径桥梁钻孔灌注桩桩侧摩阻力试验结果, 给出了该地区主要土 的侧摩阻力及其极限摩 阻力建议值。 试验表明:相当一部分桩侧土 未能达到极限状态, 只有54.5%～78.4%范围内的土 达到极限值;桩 底沉渣直接影响桩顶沉降及极限承载力;随着长径比的加大, 桩侧摩阻力发挥效率降低。 :桥梁;钻孔灌注桩;静载;桩侧摩阻力;桩端阻力 :U443.15+4 　　　　　　:A Test Study on Side Frict ion of Large Diameter Bored Pile 1 2 2 GU Pei-ying , WANG De-ping , LUHui-ming (1.Nanjing Hydraulic Research Institute, Jiangsu 　Nanjing 　21002 , China; 2.Suzhou By-pass Urban Expressway Construction Headquarters, Jiangsu　Suzhou 　215007, China) Abstract:Based on the results of four large diameter bored piles under static load test in Suzhou, the magnitude of side friction of pile and its propositional magnitude are provided.It is shown that much of the soil around the pile can t be at ultimate state, with only 54.5% through 78.4%soil being at ultimate state.The bottom sediment affects tip displacement and ultimate bearing capacity.Further- more, the efficiency of side friction decreases if the ratio of length to diameter increases. Key words:Bridge;Bred pile;Static load;Side friction of pile;Tip resistance of pile , 0　 , , 2 4 1.2 ～ 1.5m、 , 。 51.5 ～72.5m , 1 -、 1 # 2 # 3 # 4 # 、 (mm) 1200 1500 1200 1500 , 、 (m) 56.5 55.5 51.5 72.5