P-Y Curves for Large Diameter Shafts in Liquefied Sand from Blast Liquefaction Tests
P-Y Curves for Large Diameter Shafts in Liquefied Sand from Blast Liquefaction Tests
复制标题
DOI：
10.1061/40822(184)2
复制
发表时间：
2005-10
期刊：
影响因子：
--
通讯作者：
K. Rollins;Luke Hales;S. Ashford;W. Camp
中科院分区：
文献类型：
--
作者：
K. Rollins;Luke Hales;S. Ashford;W. Camp
为了帮助设计位于南卡罗来纳州查尔斯顿的Ravenel大桥，在爆破诱导液化前后，对直径为2.59 m的钻孔竖井基础进行了横向荷载试验。过量孔隙压力比在75%和100%之间的诱导深度为13米，使用炸药。爆破后，荷载-挠度曲线的刚度降低到爆破前值的15%左右，侧向阻力降低导致最大弯矩增加100%。反算的p-y曲线一般有凹向上的曲线形状类似于以前在金银岛爆炸液化试验中观察到的。对于直径为2.59 m的竖井，可以使用相对于直径为0.3 m的桩的恒定桩直径修正系数9来解释增加的阻力。
To aid in the design of the Ravenel Bridge in Charleston, South Carolina, lateral 1load tests were performed on a 2.59 m diameter drilled shaft foundation before and after blasting to induce liquefaction. Excess pore pressure ratios between 75 and 100% were induced to a depth of 13 m using explosive charges. Following blasting, the stiffness of the load-deflection curve decreased to about 15% of its pre-blast value and the reduced lateral resistance led to a 100% increase in the maximum bending moment. Back-calculated p-y curves generally had concave upward curve shapes similar to those observed in previous blast-liquefaction tests at Treasure Island. The increased resistance for the 2.59 m diameter shaft could be accounted for using a constant pile diameter correction factor of nine relative to a 0.3 m diameter pile.