岩溶地层大断面铁路隧道悬臂掘进机施工穿越上部既有建筑扰动规律研究  

Study on the Disturbance Patterns of Roadheader Construction of Large-section Railway Tunnel Under-crossing Existing Buildings in Karst Stratum

作　　者：汪元冶 丁文其[1,2] 杨进京[3] 乔亚飞[1,2] 丁文云[3] WANG Yuanye;DING Wenqi;YANG Jinjing;QIAO Yafei;DING Wenyun(Department of Geotechnical Engineering College of Civil Engineering,Tongji University,Shanghai 200092;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092;Kunming Survey,Design and Research Institute Co.Ltd.of CREEC,Kunming 650200)

机构地区：[1]同济大学土木工程学院地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]中铁二院昆明勘察设计研究院有限责任公司,昆明650200

出　　处：《现代隧道技术》2024年第5期274-284,共11页Modern Tunnelling Technology

基　　金：云南科技厅重点研发计划(202303AA080003);国家自然科学基金(52090083).

摘　　要：为探究岩溶地层中悬臂掘进机施工穿越既有上部建筑物的扰动规律,提出岩溶空腔单元提取算法,依托采用悬臂掘进机施工的某铁路隧道穿越工程建立穿越节点三维精细化有限元模型,研究悬臂掘进机施工过程中的地表沉降、建筑物角点沉降、倾斜率的发展规律,探讨岩溶填充质量对地表沉降槽的影响。结果表明:(1)受建筑物基础刚度的影响,穿越施工引起的地表沉降槽呈现分段特征,地表沉降在建筑物基础范围内近似线性分布,在建筑物基础范围外的分布符合Peck公式规律;(2)穿越施工过程中,既有建筑物角点沉降和倾斜率呈现三阶段变化趋势,对应悬臂掘进机三台阶施工过程;(3)岩溶空腔填充质量对地表沉降的影响呈阶段性变化趋势,当填充质量不足70%时,随填充质量增加,地表最大沉降减小;当填充质量大于70%后,地表最大沉降基本稳定。To investigate the disturbance patterns caused by the railway tunnel excavated by the boom-type roadheader,which crosses undere the existing surface structures in karst strata,a karst cavity unit extraction algorithm was proposed,the three-dimensional refined finite element model was established based on a roadheader-excavated railway tunnel project,the ground settlement,the settlement and tilt rate of the existing surface structure were analyzed,and the impact of karst filling quantity on surface settlement trough was explored.The results indicate that:(1)Due to the foundation stiffness of the existing surface structure,the settlement trough caused by the boom-type roadheader construction exhibits segmented characteristics:it is approximately linear under the building and conforms to Peck formula form outside the building;(2)During the under-crossing process,the settlement and tilt rate of the existing surface structure show a three-staged variation trend,corresponding to the three-stage construction of boom-type roadheader;(3)The impact of karst cavity filling quantity on surface settlement exhibits a staged trend:When the filling quantity is less than 70%,the maximum surface settlement decreases with increasing filling quantity.When the filling quantity exceeds 70%,the maximum surface settlement remains stable.

关 键 词：隧道穿越 岩溶地层 既有建筑 悬臂掘进机施工 数值模拟 

分 类 号：U455[建筑科学—桥梁与隧道工程]