新型装配式基坑抢险斜撑稳定性研究  

Stability Study of a New Fabricated Diagonal Brace for Emergency Reinforcement of Excavation

作　　者：周业 王胜 刘晓明[2] 谭鑫[2] 黄华 ZHOU Ye;WANG Sheng;LIU Xiaoming;TAN Xin;HUANG Hua(3rd Construction CO.,LTD of China Construction 5th Engineering Bureau,Changsha 410116,China;College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]中建五局第三建设有限公司,长沙410116 [2]湖南大学土木工程学院,长沙410082

出　　处：《结构工程师》2022年第5期140-147,共8页Structural Engineers

基　　金：国家自然科学基金面上项目(52278348);湖南省创新型省份建设专项资金项目(2019GK1010)。

摘　　要：提出了一种新型基坑装配式斜撑支护结构,该斜撑可快速装配后处理基坑突发险情,及时遏制基坑围护结构变形,并可在基坑抢险结束后回收和重复利用。针对该新型基坑斜撑结构进行了室内物理模型试验和数值分析,获得了不同工况下斜撑荷载位移曲线和地基土变形特征,揭示了新型装配式斜撑的承载模式和失稳机理。斜撑所受荷载将由斜撑和底板两部分共同承担,斜撑+底板组合承载时的承载力明显大于底板单独承载时的承载力,且组合承载力随着斜撑的埋置长度增加不断增大,斜撑与底板共同承载具有良好的稳定性。A new type of fabricated diagonal brace structure was proposed in this paper. The diagonal bracecan be quickly assembled to support the foundation pit excavation in short time,and can be recycled andreused after the rescue. The physical model tests and numerical analysis of the proposed diagonal brace wereconducted. The load-displacement curves of diagonal braces and the deformation characteristics of the groundsoil under different working conditions were obtained,and the load-bearing mode and failure mechanism of theproposed diagonal were revealed. The load acting on the diagonal brace will be borne by the buried diagonalbrace and the bottom plate. The bearing capacity of the buried diagonal brace and bottom plate is significantlygreater than that of the bottom plate alone. The bearing capacity continues to increase with the increase of theembedded length of the buried diagonal brace,and the combination of buried diagonal brace and the bottomplate has a very good performance in stability.

关 键 词：基坑 装配式结构 斜撑 稳定性 抢险 

分 类 号：TU753[建筑科学—建筑技术科学]