考虑注浆结石体影响的隧道管片上浮理论解析  

Analysis on floating theory of tunnel segment considering influence of grouting stonebody

作　　者：朱仰凯 张可能[1,2] 胡达 肖超 张云毅[1,2] 王玺 ZHU Yangkai;ZHANG Keneng;HU Da;XIAO Chao;ZHANG Yunyi;WANG Xi(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,Central South University,Changsha Hunan 410083,China;School of Geosciences and Info-Physics,Central South University,Changsha Hunan 410083,China;Hunan Engineering Research Center of Structural Safety and Disaster Prevention for Urban Underground Infrastructure,Hunan City University,Yiyang Hunan 413002,China;CCFED Civil Engineering Co.,Ltd.,Changsha Hunan 410000,China;Hunan Yixi Engineering Construction Co.,Ltd.,Changsha Hunan 410000,China)

机构地区：[1]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083 [2]中南大学地球科学与信息物理学院,湖南长沙410083 [3]湖南城市学院城市地下基础设施结构安全与防灾湖南省工程研究中心,湖南益阳413002 [4]中建五局土木工程有限公司,湖南长沙410000 [5]湖南懿玺工程建设有限公司,湖南长沙410000

出　　处：《中国安全生产科学技术》2023年第3期93-100,共8页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(41972282)。

摘　　要：为掌握隧道管片在浆液结石体包裹下的上浮变形规律,通过研究圆管抗弯刚度,将浆液结石体与隧道管片形成的圆管组合梁转变为3层叠加组合梁;基于Girhammar 2层叠加组合梁理论与微单元力学分析,推导出考虑层间滑移效应3层组合梁等效抗弯刚度公式,进而采用温克勒弹性地基条件建立隧道管片上浮力学模型;结合工程实例,对比力学模型理论解析、实测数据和数值计算结果,并进行参数灵敏性分析。研究结果表明:力学模型理论解析、实测数据和数值计算结果吻合度较高,表明力学模型有效;浆液结石体留存厚度的增加可以有效降低隧道结构承受的弯矩,提高隧道结构安全性能;随着隧道两端约束的传递衰减,隧道上浮跨度超过140 m后,隧道变形最大值基本达到稳定。研究结果可用于预测隧道管片的上浮变形,并为隧道变形控制提供依据,促进隧道病害的安全治理。In order to grasp the floating deformation law of tunnel segments wrapped in slurry stone body,the round tube composite beam formed by the slurry stone body and the tunnel segment was transformed into a three-layer superimposed composite beam by studying the bending stiffness of round tube.Based on the theory of Girhammar 2-layer superimposed composite beam and the mechanical analysis of microunits,the equivalent bending stiffness formula of three-layer composite beam considering the interlayer slip effect was derived,and then the floating mechanical model of tunnel segment was established by using the Winkler elastic foundation conditions.Combined with engineering examples,the theoretical analysis,measured data and numerical calculation results of mechanical models were compared,and the parameter sensitivity analysis was carried out.The results showed that the theoretical analysis,measured data and numerical calculation results of the mechanical model had a high degree of agreement,indicating that the mechanical model was effective.The increase of the retained thickness ofslurry stone body could effectively reduce the bending moment borne by the tunnel structure and improve the safety performance of tunnel structure.With the transmission attenuation of the constraints at both ends of tunnel,the maximum deformation oftunnel basically reached stability after the floating span of tunnel exceeded 140 m.The research results can be used to predict the floating deformation of tunnel segments,provide a basis for tunnel deformation control,and promote the safety treatment of tunnel diseases.

关 键 词：管片上浮 浆液结石体 叠加组合梁 等效抗弯刚度 上浮力学模型 

分 类 号：X951[环境科学与工程—安全科学]