叠合式套拱加固带裂缝衬砌的变形规律试验研究

发布时间：2018-02-01 18:13

本文关键词： 公路隧道拱顶纵向裂缝叠合式套拱变形规律破坏模式　出处：《现代隧道技术》2014年06期 　论文类型：期刊论文

【摘要】：文章通过室内试验和理论分析等手段研究了套拱加固后结构的受力规律、破坏模式及承载力变化。利用石膏材料,按照1∶10(模型∶原型)的相似比,制作拱顶带纵向裂缝的素混凝土衬砌结构(裂缝深度为原衬砌厚度的1/3),并按叠合式套拱加固方案,进行钢筋混凝土套拱加固;养护后,通过室内全周径向加载装置,分级施加拱顶松散土压,并计入地层抗力的影响,研究带裂缝衬砌套拱加固后的承载能力及破坏规律。试验结果表明,叠合式套拱加固后,结构受力过程分三个阶段:"初期加载—套拱拱顶开裂、套拱拱顶开裂—拱顶叠合面裂缝出现、拱顶叠合面裂缝出现—试件破坏",关键部位破坏顺序为拱顶开裂—拱顶延性破坏—拱腰脆性断裂,整体破坏模式为延性破坏。
[Abstract]:By means of laboratory test and theoretical analysis, this paper studies the force law, failure mode and bearing capacity change of the structure strengthened with arch jackets. The similarity ratio of 1: 10 (model: prototype) is obtained by using gypsum material. The plain concrete lining structure with longitudinal crack in arch roof is made (the depth of crack is 1 / 3 of the original lining thickness, and the reinforced concrete jacketed arch is strengthened according to the superimposed arch reinforcement scheme; After maintenance, the bearing capacity and failure law of the reinforced arch with crack lining are studied by applying the loose soil pressure of arch roof and considering the influence of stratum resistance through the radial loading device of the whole circle in the room. The test results show that the bearing capacity and the failure rule of the reinforced arch are studied. After the superimposed arch reinforcement, the stress process of the structure is divided into three stages: "initial load-jacketed arch roof cracking, jacketed arch roof cracking-arch roof superimposed plane crack, arch roof superimposed plane crack-specimen failure". The failure sequence of the key parts is dome cracking, dome ductile failure and arch waist brittle fracture, and the whole failure mode is ductile failure.
【作者单位】：长沙理工大学;江西省高速公路投资集团有限责任公司;上海同岩土木工程科技有限公司;
【分类号】：U451.4
【正文快照】： 俞文生1,2桑运龙3(1长沙理工大学,长沙410114;2江西省高速公路投资集团有限责任公司,南昌330025;3上海同岩土木工程科技有限公司,上海200092)修改稿返回日期:2013-10-171引言公路隧道出现大范围衬砌裂缝、渗漏水等严重病害时,应及时进行加固,以确保结构安全与正常运营[1]。在

【相似文献】