隧道钢管混凝土复合支护结构承载特性研究  

A Study on the Bearing Characteristics of Composite Concrete-filled Steel Tube Support Structure in Tunnels

作　　者：孙会彬 张建立 杨惠翔 杨辉 王雷 魏君 蔺维南 李伟 李贺朋 SUN Huibin;ZHANG Jianli;YANG Huixiang;YANG Hui;WANG Lei;WEI Jun;LIN Weinan;LI Wei;LI Hepeng(School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101;China Construction Civil Engineering Co.,Ltd.,Jinan 250101;School of Civil Engineering,Ludong University,Yantai 264025;The First Company of China Eighth Engineering Bureau Ltd.,Jinan 250000)

机构地区：[1]山东建筑大学交通工程学院,济南250101 [2]中国建筑土木建设有限公司,济南250101 [3]鲁东大学土木工程学院,烟台264025 [4]中建八局第一建设有限公司,济南250000

出　　处：《现代隧道技术》2023年第2期103-114,共12页Modern Tunnelling Technology

基　　金：国家自然科学基金(52209140);山东省住房城乡建设科技计划项目(2021-K5-34);山东建筑大学博士科研基金项目(XNBS20106)。

摘　　要：为研究钢管混凝土复合支护结构变形破坏特征及承载机制,考虑拱架-混凝土粘结滑移特性,在支护结构典型破坏模式的基础上,开展支护结构纯弯室内试验及精细化数值模拟研究,对试件在弯矩作用下的力学响应进行深入分析,明确拱架布设位置、喷射混凝土强度、钢筋网直径及保护层厚度等参数对结构承载性能的影响规律。结果表明,钢管混凝土无钢筋网试件(SRCS-FW)强度较低,混凝土迅速开裂后与拱架发生滑移破坏,钢管混凝土双层钢筋网试件(SRCS-FS)变形效果较好,呈现较好的后期承载特性;SRCS-FS试件临界滑移破坏强度较高,其极限弯矩比SRCS-FW试件极限弯矩高40.9%;构件弹性变形阶段拱架、钢筋网、混凝土三者协同作用效果明显,开裂阶段试件拉力主要由受拉侧钢筋网和拱架分担,压力由拱架和受压区混凝土分担;支护结构参数设计要综合分析其承载性能、经济性及工程经验和施工便利性。To investigate the deformation and failure characteristics and bearing mechanism of composite concretefilled steel tube support structure,pure bending indoor tests and refined numerical simulation are carried out for support structures,taking into account the arch frame-concrete bond-slip characteristics on the basis of typical fail⁃ure mode of support structures.An in-depth analysis is conducted on the mechanical response of the specimens un⁃der the action of bending moment,so as to clarify the impact pattern of different parameters,such as arch frame in⁃stallation position,shotcrete strength,steel mesh diameter and protective layer thickness,on the structural bearing capacity.The results show that the concrete-filled steel tube specimens without steel mesh(SRCS-FW)are weaker in strength,the concrete cracks rapidly and then slips with the arch frame,while the concrete-filled steel tube speci⁃mens with double-layer steel mesh(SRCS-FS)are better in terms of deformation effect and display better bearing characteristics later.Besides,the SRCS-FS specimen has a higher strength of critical slip failure and its ultimate bending moment is 40.9%higher than that of the SRCS-FW specimen.Furthermore,the synergistic effect of the arch frame,the steel mesh and the concrete is significant in the elastic deformation phase of the component.The ten⁃sile force of the specimen in the cracking phase is mainly shared by the tensile-side steel mesh and the arch frame,while the pressure is shared by the arch frame and the concrete under compression.It is suggested that the parame⁃ter design for the support structure should take into account its load-bearing performance,economy and engineering experience,and construction convenience.

关 键 词：隧道工程 钢管混凝土 复合支护结构 承载特性 参数分析 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]