确定盘径下扩孔桩临界盘间距取值试验和数值分析  

Test and Numerical Analysis on Critical Disk Spacing of Reamed Pile with Disk Diameter

作　　者：曾繁斌 ZENG Fanbin(Guangdong Road and Bridge Construction Development Co.,Ltd.,Guangzhou Guangdong China 510623)

机构地区：[1]广东省路桥建设发展有限公司,广州510623

出　　处：《广东公路交通》2022年第6期93-97,共5页Guangdong Highway Communications

摘　　要：扩孔桩的支盘提供了端阻力,可以充分调用地层承载性能,相较于直杆桩具有明显的承载性能优势。扩孔桩的盘间距是扩孔桩承载性能的主要影响因素之一,然而,目前尚没有针对广东深厚软土地质条件的临界盘间距成熟的经验和方法。针对广东深厚软土的地质条件,对扩孔桩临界盘间距进行试验和数值分析。进行不同盘间距下双盘扩孔桩的单桩承载力数值模拟,通过桩体位移和土体变形分析盘间距对极限承载力的影响,给出了可用于深厚软基处理的扩孔桩经验盘间距。The support plate of the reamed pile provides the end resistance, which can fully utilize the bearing performance of the stratum, and has obvious bearing advantages compared with the straight rod pile. The disk spacing of reamed pile has been one of the main factors affecting the bearing performance of reamed pile. However, there is no effective empirical method of critical disk spacing for deep soft soil conditions in Guangdong Province. According to the geological condition of deep soft soil in Guangdong Province, the empirical critical disk spacing of reamed pile has been analyzed experimentally and numerically. Numerical simulation of bearing capacity of single pile with double disk reamed pile with different disc spacing has been carried out. The influence of disk spacing on ultimate bearing capacity has been analyzed by pile displacement and soil deformation, and empirical disk spacing of reamed pile which can be used for deep soft foundation treatment has been proposed.

关 键 词：扩孔桩 临界盘间距 数值模拟 现场验证 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]