斜桩与直桩组合多级支护在基坑中的应用与分析  

Application and Analysis of Inclined Pile and Straight Pile Combined Multi-stage Support in Foundation Excavation

作　　者：余地华 田野 赖国梁 陈国 宋志 张涛 柳瑶 YU Dihua;TIAN Ye;LAI Guoliang;CHEN Guo;SONG Zhi;ZHANG Tao;LIU Yao(General Construction Company of CCTEB Group Co.,Ltd.,Wuhan,Hubei 430070,China;Hubei Building Construction Technology Co.,Ltd.of CCTEB Group Co.,Ltd.,Wuhan,Hubei 430070,China)

机构地区：[1]中建三局集团有限公司工程总承包公司,湖北武汉430070 [2]湖北中建三局建筑工程技术有限责任公司,湖北武汉430070

出　　处：《施工技术（中英文）》2022年第7期85-88,131,共5页Construction Technology

基　　金：中建股份科技研发课题(CSCEC-2020-Z-34)。

摘　　要：在一些基坑工程中,倾斜桩和多级支护可减少或消除支撑使用、增加悬臂支护深度,其工程应用也越来越受到重视。基于工程实例,通过数值计算方法,开展斜-直组合多级支护结构分级高度比、平台宽度、倾斜角度等参数对支护效果的影响分析。结果表明:斜桩与多级支护进行组合可显著控制位移,且最大位移主要发生在第1级支护,当第1级支护高度较小时,宜选择一直一斜多级支护结构,反之,则宜选择一斜一直结构;平台宽度<1倍挖深时,增大平台对减少桩身位移更显著,平台宽度>1倍挖深时,桩身位移随平台宽度变化趋于平稳;第1级为斜桩的多级支护在0°~5°倾角范围内桩身位移随倾角增加降幅更大,其后变化趋于均匀;支护空间较大且位移控制要求更严时,可采用二斜多级支护结构。工程计算与实测结果表明,斜桩与直桩组合多级支护效果良好。In some foundation excavation engineering, inclined pile and multi-stage support can reduce or eliminate the use of support and increase the depth of cantilever support.Based on the engineering example, the influence of parameters such as height ratio, platform width and inclined angle on the supporting effect was analyzed by numerical calculation method.The results show that the combination of inclined pile and multi-stage support can significantly control the displacement, and the maximum displacement mainly occurs in the first stage support. When the first stage support height is small, the inclined multi-stage support structure should be selected. Otherwise, the inclined multi-stage support structure should be selected.When the platform width is less than 1 times the depth, increasing the platform can reduce the pile displacement more significantly. When the platform width is more than 1 times the depth, the pile displacement tends to be stable with the change of platform width.The first level is that the pile displacement decreases more with the increase of inclination Angle in the range of 0°~5°, and then the change tends to be uniform.When the supporting space is larger and the displacement control requirement is more strict, the two-slope multistage supporting structure can be adopted.

关 键 词：基坑 支护 斜直桩组合 多级支护 参数分析 

分 类 号：TU470[建筑科学—结构工程]