摘要
工程上通常用一种静载试验确定扩底桩的竖向承载力 ,而本文用两种静载试验方法 (即直接试验法和间接试验法 )确定扩底桩的承载力 ,据此对端承于粗砂层的埋深 1 4.5m左右的扩底桩竖向承载性状进行了分析。结果表明 ,两种试验方法得到的SD1、SD2桩的极限承载力值分别相差 5 %和 1 0 %。扩底直径为 3.40m的SD1桩的极限承载力为 960 0kN ,端阻力达86% ;扩底直径为 3.0 0m的SD2桩的极限承载力为 685 0kN ,端阻力占 81 %。当桩顶沉降 1 8.72mm左右时 ,SD1、SD2桩摩阻力已充分发挥 ;而端阻力充分发挥时 ,SD1、SD2桩顶沉降分别达 31 .85 5mm和 2 9.34mm。直径相同时 。
The static load test is generally used to determine the vertical bearing capacity of large diameter belled pile in engineering. In this paper, the two statistic test methods (direct and indirect ones) were presented. A study on the bearing behaviors of belled piles embedded in coarse sand with the depth of 14.5m at the same site was carried out. The results show that the errors of test on ultimate bearing capacity of SD1, SD2 piles by two methods are 5% and 10% respectively. The ultimate bearing capacity of SD1 pile (bottom diameter 3.40m) is 9600kN and the end resistance is up to 86%; for the SD2 pile (bottom diameter 3.00m) are 6850kN and 81% respectively. As the settlement on the pile head is about 18.72mm, the skin friction of both piles has reached ultimate state. At the ultimate state of end resistance, the settlement of SD1 and SD2 piles are 31.855mm and 29.34mm respectively. The vertical bearing capacity of belled pile is greater than that of the pure friction pile and shaft with the same diameter.
出处
《地下空间》
CSCD
2003年第3期272-276,共5页
Underground Space
基金
高等学校博士点基金项目 ( 2 0 0 0 0 2 4 72 4 )资助
上海市重点学科(岩土工程)建设项目资助
教育部科学技术研究重点项目
关键词
大直径扩底桩
竖向承载力
静载试验
承载力
indirect static load test
static load test
large diameter belled pile
vertical bearing capacity
