岩溶区布袋灌注桩承载特性研究  

Study on load-bearing characteristics of bagged cast-in-place pile in karst area

作　　者：汪思源 张福友 梅国雄 肖良 巫志文 WANG Siyuan;ZHANG Fuyou;MEI Guoxiong;XIAO Liang;WU Zhiwen(North Engineering Company,China Communication Construction of Road and Bridge Co.,Ltd.,Beijing 100000 China;Guangxi Xinfazhan Communication Group Co.,Ltd.,Guangxi Nanning 530004 China;Ocean College,Zhejiang University,Zhejiang Zhoushan 316000 China;College of Civil Engineering,Guangxi University,Guangxi Nanning 530004 China)

机构地区：[1]中交路桥北方工程有限公司,北京100000 [2]广西新发展交通集团有限公司,广西南宁530004 [3]浙江大学海洋学院,浙江舟山316000 [4]广西大学土木建筑工程学院,广西南宁530004

出　　处：《山东交通科技》2025年第1期5-10,共6页

基　　金：国家自然科学基金资助项目,项目编号:51878185。

摘　　要：为解决岩溶区钻孔灌注在施工过程中存在混凝土浆液流失、成桩质量差等问题,提出了一种新型桩基—布袋灌注桩,分别设计三组室内模型试验和数值模型,来分析布袋灌注桩的承载特性。结果表明:(1)由于枝状体结构的存在,布袋灌注桩的承载性能优于等直径桩;(2)布袋灌注桩的枝状体结构能够有效降低桩端溶洞对桩基承载力的影响;(3)在初始加载阶段,上部枝状体承受的荷载比例较大,随着加载的持续进行,下部枝状体和桩端承受的荷载比例逐渐增加。试验和数值模拟结果证明了布袋灌注桩优越的承载性能,为布袋灌注桩在实际工程中的运用提供了思路。In order to solve the problems of concrete slurry loss and poor pile quality in the construction process of borehole grouting in karst area,a new type of pile foundation-bag filling pile is proposed.Three groups of indoor model tests and numerical models were designed to analyze the load-bearing characteristics of bagged cast-in-place piles.The results show that due to the existence of dendritic structure,the load-bearing capacity of bagged cast-in-place pile is better than that of equal diameter pile.The dendritic structure can effectively reduce the influence of karst cave on the load-bearing capacity of pile foundation.In the initial loading stage,the upper branch bears a large proportion of load.As the loading continues,the proportion of load borne by the lower branch and the pile end gradually increases.The test and numerical simulation results prove the superior bearing performance of the bagged cast-in-place pile,which provides a way for the application of the bagged cast-in-place pile in practical engineering.

关 键 词：布袋灌注桩 承载特性 数值模拟 岩溶地区 

分 类 号：TU473.1[建筑科学—结构工程]