荷载倾角对大直径长桩承载特性的影响分析  

Numerical analysis of load inclination influence on the bearing behavior of large-diameter long pile

作　　者：王孝兵 文松霖[2] 徐文强[3] 柴洪涛[2] 

机构地区：[1]胜利油田胜利勘察设计院有限公司,山东东营257026 [2]长江科学院,湖北武汉430010 [3]中国长江三峡集团公司溪洛渡工程建设部,云南永善657300

出　　处：《水利水运工程学报》2012年第2期8-14,共7页Hydro-Science and Engineering

基　　金：国家自然科学基金资助项目(50978034)

摘　　要：基于数值分析与荷载传递相结合的方法,利用FLAC3D对倾斜荷载下大直径长桩进行模拟,分析了荷载倾角对桩的承载特性的影响.结果表明,荷载倾角影响桩的承载方式,随着荷载倾角的逐渐增加,桩的承载方式由竖向承载为主逐渐向水平承载为主转化.荷载倾角在0°～20°范围内变化时,桩顶以沉降为主;在30°～90°范围内变化时,桩顶水平位移大于沉降.随着荷载倾角的增大,上部桩体侧移显著增大,桩两侧合土抗力零点向深部移动,桩端阻力减小.桩前侧和桩后侧最大合土抗力与荷载倾角的正弦值近似呈线性递增关系;桩前侧最大合土抗力受荷载倾角的影响比桩后侧最大合土抗力大.Based on numerical analysis-load transfer hybric combined method, FLAC30 is used to simulate the large-diameter long pile under inclined loads and study the effect of inclination on its bearing behavior. The results show that with the gradual increase of inclination angle, the carrying mode converts from vertical-load dominated to horizontal-load dominated. When inclination varies in the range of 0° -20°, pile top deformations are mainly settlement; when inclination varies in the range of 30°- 90°, pile top deformations are mainly horizontal displacement. With the increasing of inclination, lateral displacement of the pile significantly increases, zero point of the resultant lateral soil pressure moves to the deep, and the end resistance decreases. The maximum resultant lateral soil pressure on the shaft almost increases linearly with the increasing of the sine value of inclination. The maximum resultant lateral soil pressure in the front side is influenced more seriously by the inclination than that on the back side.

关 键 词：倾斜荷载 荷载倾角 桩身侧移 土抗力 数值分析 大直径长桩 

分 类 号：TU473.11[建筑科学—结构工程]