土钉支护基坑阳角的冗余度研究  

Study on Redundancy of Foundation Excavation Convex Location Supported by Soil Nailing

作　　者：王海旭[1] 程雪松[1] 郑刚[2] 

机构地区：[1]天津大学土木工程系,天津300072 [2]滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《施工技术（下半月）》2011年第12期37-42,共6页Construction Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB732106)

摘　　要：基坑阳角是变形控制的不利位置,在设计中应予以重点加固。在基坑工程领域引入冗余度设计理论的概念,对土钉支护基坑的阳角进行腰梁加固,并对其冗余度进行分析。对比分析了原体系与冗余体系的坑壁水平位移、土钉轴力等内容;研究了局部土钉失效时,土钉-腰梁支护体系的工作状况。结果证明对土钉支护基坑的阳角进行腰梁加固能够有效控制危险位置位移,转移冗余荷载,增加荷载传递路径,即能够提高支护体系冗余度。As the convex location of foundation excavation is disadvantageous locations to control its displacement,a special consolidation design is necessary.The redundancy theory on design is introduced for the underground engineering field.The convex location of foundation excavation supported by soil nailing has been consolidated with breast beam and its redundancy has been analyzed.The horizontal displacement of the side-wall,the axial force of soil nailing in original system and redundant system have been respectively analyzed and compared.The work situation of soil nailing with breast beam support system when part of soil nailing failed has been studied.The results prove that consolidating the convex location of excavation supported by soil nailing with breast beam can effectively control the displacement of dangerous location,transfer the redundant load and increase the transferring path.Hence,it can improve the redundancy of support system.

关 键 词：地下工程 基坑 阳角 土钉 冗余度 

分 类 号：TU311.41[建筑科学—结构工程]