长短组合悬臂支护结构在深厚软土基坑的设计实践与应用  

Design Practice and Application of Long-Short Combined Cantilever Support Structure in Deep Soft Soil Foundation Pit

作　　者：马勇[1,2] 吴进明 李川 MA Yong;WU Jinming;LI Chuan(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;The Geotechnical Engineering Technology Center of Guangdong Province,Guangzhou 510635,China)

机构地区：[1]广东省水利水电科学研究院,广州510635 [2]广东省岩土工程技术研究中心,广州510635

出　　处：《广东水利水电》2025年第3期66-71,共6页Guangdong Water Resources and Hydropower

摘　　要：常规基坑支护结构一般采用等长布置,对于深厚软土基坑来说,支护结构一般需要穿透软土层进入下卧硬土层,支护结构较长,采用等长布置导致支护的经济性非常差。结合某典型深厚软土地质条件下的悬臂式长短组合支护结构基坑实例,将支护结构的内力变形和稳定性计算分开考虑,长桩满足支护结构的稳定性要求,短桩和长桩共同满足支护结构的内力变形要求,当短桩的嵌固深度达到一定程度后,增加短桩的长度对控制支护结构的内力变形基本无影响,进而经济合理地确定短桩的长度,最后采用有限元法进行对比分析。项目的实施效果较好,支护结构的变形均在规范的允许范围内,研究成果可为类似项目提供借鉴。Conventional foundation pit support structures generally adopt equal-length layout.For deep soft soil foundation pits,the support structure generally needs to penetrate the soft soil layer and enter the underlying hard soil layer,and the support structure is relatively long.The adoption of equal-length layout leads to very poor economy of the support.Combined with an example of a cantilever long-short combined support structure foundation pit under a typical deep soft soil geological condition,the internal force deformation and stability calculation of the support structure are considered separately.The long pile meets the stability requirements of the support structure,and the short pile and the long pile jointly meet the internal force deformation requirements of the support structure.When the embedded depth of the short pile reaches a certain level,increasing the length of the short pile has basically no effect on controlling the internal force deformation of the support structure,and then the length of the short pile is determined economically and reasonably.Finally,the finite element method is used for comparative analysis.The implementation effect of the project is good,and the deformation of the support structure is all within the allowable range of the specification.The research results provide a reference for similar projects.

关 键 词：基坑工程 长短桩 深厚软土 悬臂支护结构 

分 类 号：TU473.1[建筑科学—结构工程]