管幕和横梁作用下大断面开挖变形响应研究  

Study on Deformation Response Caused by Large-Section Excavation Under the Support of Pipe-Roof and Beam

作　　者：柏谦 赵文[1] 曹文欣 卢彦军 BAI Qian;ZHAO Wen;CAO Wen-xin;LU Yan-jun(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;The Fifth Department of China Railway No.4 Bureau Group Co.,Ltd.,Jiujiang 332000,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]中铁四局集团第五工程有限公司,江西九江332000

出　　处：《东北大学学报（自然科学版）》2024年第1期129-136,共8页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51878127).

摘　　要：基于管幕与横梁作用下大断面开挖相似模型试验,研究开挖引起的管幕变形和地表沉降变化规律.为充分研究参数变化对管幕变形和地表沉降的影响,运用有限元软件建立三维数值模型,以此模型为依据,分析管幕抗弯刚度和横梁抗弯刚度对管幕变形和地表沉降的影响,并根据模糊数学理论对最优刚度匹配进行研究.研究结果表明:管幕结构整体变形类似于“板”,且关于中间管幕对称,管幕跨中断面地表沉降呈“凹槽”型,符合Peck曲线分布;管幕变形和地表沉降均与横梁刚度和管幕刚度呈指数函数关系,且对横梁刚度变化更为敏感;管幕刚度与横梁刚度分别为0.5D和2K时,可以兼顾安全性与经济性.Based on the similar model test of large-section excavation under the action of pipe-roof and beam,the variation law of pipe-roof deformation and surface settlement caused by excavation was studied.In order to fully study the influence of parameter changes on the pipe-roof deformation and surface settlement,a three-dimensional numerical model was established by using the finite element software.Based on this model,the effects of the flexural stiffness of the pipe-roof and the beam on the pipe-roof deformation and surface settlement were analyzed,and the optimal stiffness matching was studied according to the fuzzy mathematical theory.The results indicate that the overall deformation of the pipe-roof structure resembles a“plate”and exhibits symmetry about the middle pipe-roof.The surface settlement of the cross section of the pipe-roof forms a“grooved”pattern,conforming to the Peck curve distribution.The pipe-roof deformation and surface settlement are exponential functions of the beam stiffness and the pipe-roof stiffness,with greater sensitivity to changes in the beam stiffness.The safety and economy can be taken into account when the beam stiffness and the pipe-roof stiffness are 0.5D and 2K respectively.

关 键 词：管幕 模型试验 管幕变形 地表沉降 刚度匹配 

分 类 号：TU94[建筑科学—建筑技术科学]