托换桩钻孔施工对既有受荷桩承载机理的影响研究  

Study on the Influence of Underpinning Pile Drilling Construction on the Bearing Mechanism of Existing Loaded Pile

作　　者：单华峰 夏唐代[2] 杨杰[4] 蒋对选 王春凌 张龙 Shan Huafeng;Xia Tangdai;Yang Jie;Jiang Duixuan;Wang Chunling;Zhang Long(School of Civil Engineering and Architecture,Taizhou University,Taizhou Zhejiang 318000,China;Research Center of Costal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Fangyuan Construction Group Co.,Ltd,Taizhou Zhejiang 318000,China;Zhejiang Fangyuan New Material Co.,Ltd,Taizhou Zhejiang 318000,China;Scholar of Engineering Management Co.,Ltd.,Hangzhou 310000,China;Taizhou Prefab Construction Technical Co.,Ltd,Taizhou Zhejiang 318000,China)

机构地区：[1]台州学院建筑工程学院,浙江台州318000 [2]浙江大学滨海与城市岩土工程研究中心,杭州310058 [3]方远建设集团股份有限公司,浙江台州318000 [4]浙江方远新材料股份有限公司,浙江台州318000 [5]大学士工程管理有限公司,杭州310000 [6]台州普立德建筑科技有限公司,浙江台州318000

出　　处：《科技通报》2022年第1期90-96,共7页Bulletin of Science and Technology

基　　金：国家自然科学基金青年项目(52009087);浙江省自然科学基金探索项目(LQ20E080010);浙江省基础公益研究计划项目(LGF19E090005);浙江省博士后择优资质项目(zj20180081)。

摘　　要：托换桩与既有受荷桩之间距离较小,从而导致托换桩钻孔施工过程可能对既有受荷桩承载机理带来一定的影响。以浙江饭店地下车库翻修扩建工程为背景,通过Mindlin原理及Hoek-Brown破坏准则分析了托换桩钻孔施工过程对既有受荷桩桩侧及桩端阻力发挥机理。得出:在上部土层中,既有桩桩侧摩阻力随着钻孔直径的增大而缓慢降低,随着钻孔数量的增加而降低;在下部土层中,既有桩桩侧摩阻力随着钻孔直径的增大而缓慢增大,随着钻孔数量的增加而增加;在托换桩钻孔端部一定范围内,既有桩桩侧将出现负摩阻力;桩孔间距对既有桩桩侧摩阻力的影响可忽略不计;托换桩钻孔数量,钻孔深度,钻孔直径及间距对既有桩桩端阻力的影响可忽略不计。The drilling construction may have some certain impact on the bearing mechanism of the existing loaded pile, due to their distance is small. This paper analyzes mechanism of the skin and end resistance of the existing loaded pile during the drilling construction of underpinning pile by using Mindlin principle and Hoek-Brown failure criterion, based on the Zhejiang Hotel Expansion Project. The result shows: in the upper soil layer, the skin friction of existing pile decreases slowly with the increase of borehole diameter and decreases with the increase of borehole number;In the lower soil layer, the skin friction of existing pile increases slowly with the increase of borehole diameter and the number of boreholes;the negative friction of existing pile will appear on the end of underpinning pile, side of existing pile;the influence of space on the skin friction of existing pile can be ignored;the influence of the number, depth, diameter and space on the end resistance of the existing pile can be ignored.

关 键 词：地下室增层 开挖 托换桩 既有桩 钻孔 

分 类 号：TU398[建筑科学—结构工程]