摘要
依托某滑坡蠕动作用下的高速铁路隧道工程,设计并构建包括5大子系统,具备监测数据自动采集、数据传输、结构安全评价及预警等功能的隧道结构安全预警系统;分析滑坡蠕动作用下依托工程隧道结构应力在时间、空间上的分布规律,验证系统的可靠性和应用效果。结果表明:通过静态监测系统对隧道结构应力开展自动、实时、长期的安全监测及预警,设计思路具有可行性,构建的结构安全预警系统具备工程可靠性;隧道衬砌结构应力对滑坡蠕动作用的响应是长期而缓慢的,应力在经过4年“波浪式”增长后仍未稳定,其中套衬段最大钢架应力为-19.95 MPa、最大混凝土应力为-15.51 MPa,拆换段最大钢筋应力为-59.14 MPa、最大混凝土应力为-29.55 MPa;当滑面位于隧道下方时,隧道结构承受偏压荷载,拱顶、靠河侧拱部及靠山侧边墙部位的应力较大,且位于滑体边界处断面的应力大于其他断面。该系统可用于高速铁路隧道结构安全状况的评价和预警,并为保障隧道运营安全提供技术支持。
Based on a high-speed railway tunnel project under the action of landslide creep,a safety early warning system of tunnel structure is designed and constructed,including five subsystems and possessing functions such as automatic collection of monitoring data,data transmission,structural safety evaluation and early warning.The distribution law of the tunnel structural stress in time and space under the action of landslide creep is analyzed,and reliability and application effect of the system are verified.The results show that the design idea of using a static monitoring system to carry out automatic,real-time,and long-term safety monitoring and early warning of tunnel structural stress is achievable,and the constructed system of structural safety early warning has engineering reliability.The response of tunnel lining structural stress to landslide creep action is long-term and slow,and the stress is still unstable after four years of“wave-like”growth.In the lining reinforcement section,the maximum steel frame stress is-19.95 MPa,and the maximum concrete stress is-15.51 MPa,while in the lining replacement section,the maximum steel reinforcement stress is-59.14 MPa,and the maximum concrete stress is-29.55 MPa.When the sliding surface is located below the tunnel,the tunnel structure bears eccentric compression load,and the stresses are larger at places of the arch vault,the side arch close to the river,and the side wall close to the mountain.Meanwhile,the stresses of the section at the boundary of the sliding body are greater than those of other sections.The system can be used for the evaluation and early warning of the structural safety condition of high-speed railway tunnels,and can also provide technical support for ensuring the safety of tunnel operation.
作者
孙明磊
陶正委
朱永全
李新志
SUN Minglei;TAO Zhengwei;ZHU Yongquan;LI Xinzhi(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2023年第5期147-157,共11页
China Railway Science
基金
国家自然科学基金资助项目(52178391)
省部共建交通工程结构力学行为与系统安全国家重点实验室自主课题(ZZ2021-09)
中国铁路总公司科技研究开发计划课题(2016T002-C)。
关键词
隧道
滑坡
蠕动
结构应力
安全预警系统
Tunnel
Landslide
Creep
Structural stress
Safety early warning system
作者简介
第一作者:孙明磊(1978-),男,山东省沂水人,副教授,博士。E-mail:sml@stdu.edu.cn;通讯作者:朱永全(1960-),男,安徽省枞阳人,教授,博士研究生导师,博士。E-mail:7935526@163.com。
