软土地区大直径复合后注浆超长灌注桩承载特性研究  

Study on Bearing Characteristics of Large Diameter Super Long Pile with Composite Grouting in Soft Soil Areas

作　　者：周晓龙 蔡帆 张静 卢盛宏 Zhou Xiaolong;Cai Fan;Zhang Jing;Lu Shenghong(Baisheng United Group Co.,Ltd.,Wenzhou 325024,China;Bodi Construction Group Co.,Ltd.,Wenzhou 325005,China)

机构地区：[1]百盛联合集团有限公司,浙江温州325024 [2]博地建设集团有限公司,浙江温州325005

出　　处：《市政技术》2025年第1期167-175,182,共10页Journal of Municipal Technology

基　　金：浙江省建设科研项目(2023K041)。

摘　　要：由于复合后注浆超长灌注桩荷载传递规律尚不明晰,因此开展了软土场地超长灌注桩大吨位静载试验,系统分析了直径为1.0 m、桩长为110 m超长桩的荷载-位移(Q-s)关系,桩身轴力、桩侧摩阻力的变化特性。研究结果表明:Q-s曲线多呈缓变型特征,在极限荷载作用下,灌注桩身出现了一定的塑性变形;复合后注浆作用使得桩侧摩阻力发挥所需相对位移变小,而桩端阻力则受影响较小,在加载至极限状态下其端阻比仍不足2%,表明场地内超长灌注桩呈摩擦桩特性;此外,桩端阻力和桩端附近的桩侧摩阻力存在显著的耦合效应,也就是桩端后注浆促使桩端附近桩侧摩阻力出现了一定的增长。该研究成果可为超长灌注桩的理论研究与工程实践提供参考。In order to investigate load transfer law of super long pile with composite grouting,the large tonnage static load tests of super-long grouted piles in soft soil areas was conducted to analyze the load-displacement relationship of super long pile with the diameter of 1.0 m and length of 110 m,the variation characteristics of axial force of the pile body and lateral friction resistance at the pile side.The results show that most of the Q-s curves exhibits slow changing characteristic.Under the extreme load,the grouted pile body shows the plastic deformation;That composite grouting make the relative deformation needed by lateral friction resistance at the pile side become smaller,the resistance at the pile end is less affected and less than 2%under the extreme state,which indicate the super long grouted piles behave as friction piles.There’re obvious coupling between the pile end resistance and the surrounding side friction resistance,which means that post-grouting technique at the pile end improves the side friction resistance in a certain degree.The test results are available for reference in the theory research and engineering application of super-long bored piles with composite grouting.

关 键 词：超长桩 复合后注浆 静载试验 侧摩阻力 软土地区 

分 类 号：TU473.1[建筑科学—结构工程]