地下工程连通接驳等效刚度加固机理及方法  

Reinforcement Mechanism and Method of Equivalent Rigidity of Connection in Underground Engineering

作　　者：雷升祥[1,2] 陈桥枫 赵伟 丁正全 高飞鹏[3] Lei Shengxiang;Chen Qiaofeng;Zhao Wei;Ding Zhengquan;Gao Feipeng(Key Laboratory Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,P.R.China;China Railway Construction Co.Ltd.,Beijing 100855,P.R.China;China Railway 18th Bureau Group Co.Ltd.,Tianjin 300222,P.R.China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031 [2]中国铁建股份有限公司,北京100855 [3]中铁十八局集团有限公司,天津300222

出　　处：《地下空间与工程学报》2022年第4期1347-1354,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家重点研发计划(2018YFC0808700,2018YFC0808703,2018YFC0808706);非饱和土力学特性及工程技术四川省高校工程研究中心开放基金项目(SC-FBHT2022-05)。

摘　　要：地下工程拓建连通接驳时,通常侧重既有结构开洞与加固的强度校核,对结构刚度在内力重分配中的作用重视不够,加固环梁初始断面的确定亦缺乏依据。基于超静定结构的力学特性,提出拓建结构连通接驳的等效刚度加固机理及方法。得出如下结论:(1)超静定结构对变形的敏感性强,连通接驳设计及施工应降低开洞变形对既有结构内力的影响;(2)连通接驳等效刚度的目的是实现加固环梁与拆除结构刚度的等效性;(3)等效刚度法为加固环梁初始断面的确定提供计算方法,为结构强度校核提供依据;(4)建议连通接驳采用“先加固、后开洞”的措施,实现开洞过程中,加固环梁承担主要的应力分配,保护既有结构的安全。The expansion and connection of underground engineering have always focused on the strength check of the opening and reinforcement of the existing structure, and little attention is paid to the role of structural rigidity in the redistribution of internal forces. The determination of the initial section of the reinforced ring beam also lacks basis. An equivalent stiffness reinforcement mechanism and method for the connection of extension structures are proposed based on the mechanical properties of statically indeterminate structures. The conclusions are as follows:(1) The design and construction of the connecting connection should reduce the effect of opening deformation on the internal force of existing structures because of the sensitivity of statically indeterminate structures to deformation;(2) The purpose of equivalent stiffness of connected connection is to achieve the equivalent stiffness between reinforced ring beam and demolished structure;(3) The equivalent stiffness method not only provides the calculation method for the selection of the initial section of the reinforced ring beam, but also provides the basis for checking the strength of the structure;(4) It is recommended to adopt the measures of "reinforce first and then open holes" for connection In the process of opening, the reinforced ring beam bears the main stress distribution to protect the safety of the existing structure.

关 键 词：地下工程 连通接驳 等效刚度 结构加固 

分 类 号：TU43[建筑科学—岩土工程]