交通隧道高强约束混凝土拱架性能研究与应用  

Research and Application of High Strength Confined Concrete Arch in Traffic Tunnel

作　　者：王琦[1,2] 肖宇驰[1,3] 江贝 李术才[1] 何满潮[2] 辛忠欣[1,3] 窦鹏飞 WANG Qi;XIAO Yu-chi;JIANG Bei;LI Shu-cai;HE Man-chao;XIN Zhong-xin;DOU Peng-fei(Research Center of Geotechnical Engineering,Shandong University,Jinan 250061,Shandong,China;State Key Laboratory for Geo Mechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Shandong Tianqin Engineering Technology Co.Ltd.,Heze 274799,Shandong,China)

机构地区：[1]山东大学岩土工程研究中心,山东济南250061 [2]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [3]山东天勤工程科技有限公司,山东菏泽274799

出　　处：《中国公路学报》2021年第9期263-272,共10页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(52074164,42077267,41941018,51927807);山东省重大科技创新工程项目(2019SDZY04);山东省高等学校“青创科技计划”项目(2019KJG013);山东省自然科学基金项目(ZR2020JQ23)。

摘　　要：在交通隧道,尤其是大断面交通隧道建设过程中常面临开挖扰动剧烈,围岩控制困难,传统支护强度不足,易出现支护构件破断、拱架屈曲失稳、拱顶冒落掉块等问题。约束混凝土拱架是一种高强、高刚、稳定性好的新型支护形式,能够满足此类隧道的围岩控制要求。目前针对交通隧道约束混凝土拱架的研究均为单榀小比尺试验,无法模拟现场拱架之间的协同承载,试验结果与现场拱架真实受力和变形情况存在较大差别。基于此,研发了交通隧道支护结构大型力学试验系统,开展了组合工字钢拱架、组合约束混凝土拱架与单榀约束混凝土拱架的大比尺力学性能对比试验,研究了拱架的变形破坏机制与整体承载性能。试验结果表明:(1)工字钢拱架整体呈现"拱顶弯曲,拱腰弯扭,拱架变扁平"的变形形态,变形破坏严重。2类约束混凝土拱架的节点位置在加载后期出现大变形或破坏,单榀拱架拱顶出现平面内弯曲,整体变形较为明显,组合拱架除节点处焊缝撕裂外,加载结束时整体未出现较大变形。(2)组合约束混凝土拱架的刚度和承载能力分别是组合工字钢拱架的2.51倍和2.63倍,是单榀约束混凝土拱架的4.18倍和2.78倍,组合约束混凝土拱架稳定性能和承载能力较高。(3)试验拱架均呈现出拱顶、拱底外侧受压,拱腰外侧受拉的受力特性,拱顶位置应力的增长速率较快,拱腰位置由于向外变形受限,易发生平面外失稳,拱顶和拱腰是拱架的关键受力位置。在上述研究的基础上,提出了约束混凝土支护体系在交通隧道中应用的工程建议,研究成果可为该类支护体系的设计和后期研究提供依据。There are several challenges in the construction of traffic tunnels,such as intense excavation disturbance,weak surrounding rock control,and insufficient strength of traditional support forms,particularly in large cross-section traffic tunnels.Issues such as support components breaking,arch buckling and instability,and vault fall-block are common.The confined concrete arch is a new type of support form with high strength,high rigidity,and good stability,which can meet the requirements of surrounding rock control in traffic tunnels.At present,research on confined concrete arches is mostly small-scale single-piece tests,which cannot simulate the cooperative bearing between the field arches.The test results are quite different from the actual force and deformation of the field arch.Based on such situations,a large-scale mechanical test system for support structures in traffic tunnels was developed to perform a comparative test.A combined I-steel arch,combined confined concrete arch,and single confined concrete arch were used as research objects to study the deformation and failure mechanism and overall bearing capacity of these types of arches.The test results show that:(1)the I-steel arch presents the overall deformation pattern of vault flexural buckling,hance flexural-torsional buckling,and flattening of the arch.Thus,failure was considerable in this type of arch.The two types of confined concrete arches undergo large deformation or failure at the joints in the late loading stage.Outplane instability of the single arch occurs at the vault.The overall deformation was considerable.The combined arch did not exhibit large deformation except joint weld tearing at the end of loading;(2)the rigidity and bearing capacity of the combined confined concrete arch are 2.51 times and 2.63 times that of the combined I-steel arch,and 4.18 times and 2.78 times that of the single confined concrete arch,respectively.The combined confined concrete arch has good stability and high bearing capacity;(3)all types of arch analyzed are un

关 键 词：隧道工程 约束混凝土拱架 对比试验 变形破坏机制 力学性能 

分 类 号：U45[建筑科学—桥梁与隧道工程]