嵌岩桩承载性能试验研究及理论分析  

Experimental Study and Theoretical Analysis on Bearing Behavior of Rock-Socketed Piles

作　　者：黄挺[1] 龚维明[1] 戴国亮[1] 

机构地区：[1]东南大学土木工程学院,南京210096

出　　处：《建筑科学》2011年第1期85-87,92,共4页Building Science

基　　金：国家自然科学基金项目(50908048);江苏省自然科学基金项目(BK2008315)

摘　　要：采用自平衡测试法对澜沧江特大桥二根人工挖孔嵌岩桩进行了静载荷试验,并采用钢筋计测试元件进行了桩身轴向应力测试,得到了桩极限承载力、桩端阻力以及桩侧摩阻力。综合分析了国内规范中嵌岩桩极限承载力理论计算的优缺点,将试桩极限承载力测试结果与现行规范极限承载力计算值进行了比较研究。研究表明规范计算结果均小于实测值,部分不计嵌岩段侧摩阻力的规范计算值过于保守。To obtain the bearing characteristics of man-excavated rock-socketed piles of Lancang River Bridge,by using the Osterberg method the axial stress tests along the shaft were conducted for two single piles based on strain gauges embedded in piles.Bearing capacity,side friction,tip resistance and load bearing properties of the piles were gained.The advantages and disadvantages of the calculation method for the ultimate bearing capacity of the rock-socketed piles in domestic standards were analyzed in detail,and a comparative study on the ultimate bearing capacity of the field measured values and the calculated values was made.The results indicate that the calculated values of the domestic standards are smaller than the field measured values,and some calculated values of the domestic standards without calculating the side friction of rock-socketed section are over-conservative.

关 键 词：桥梁工程 嵌岩桩 自平衡测试法 极限承载力 规范比较 

分 类 号：TU473[建筑科学—结构工程] TU413[建筑科学—土工工程]