摘要
采空区形成后引发地表出现不同程度的塌陷变形,且多表现为地表不均匀变形,对高铁结构物的安全存在极大的威胁。为了研究采空区引发的地表沉降变形特征,理清采空区地表变形与线上结构体之间的耦合关系,以鲁南高铁为例,通过地下水位监测、深埋点沉降监测、地表水准测量、自动化监测、InSAR监测等手段获取了同一时间段的地下水位变化、地表沉降及结构体变形特征,分析了其地下水位变化与地表沉降之间的相关性,归纳了地表变形与结构体变形之间的关系。主要结论:DK277段地表浅层沉降主要由地下水位波动引起,且与路基结构变形呈现出明显的相关性,DK372段沉降主要集中在80 m以内,地面沉降对桥梁结构变形影响不大,桩基础有效克服了地面沉降的影响。研究成果可为其他类似项目开展研究提供参考。
After the formation of mined-out areas,various degrees of surface subsidence deformations occur,often manifesting as uneven surface deformations,which pose a significant threat to the safety of high-speed rail structures.To investigate the characteristics of ground subsidence induced by mined-out areas and elucidate the coupling relationship between surface deformations and on-site structures,we took the Luran High-speed Rail as a case study.We employed methods such as groundwater level monitoring,deep-seated settlement monitoring,surface elevation measurements,automated surveillance,InSAR monitoring,and others to collect data on groundwater level changes,surface subsidence,and structural deformations during the same time period.We analyzed the correlation between groundwater level fluctuations and surface subsidence and summarized the relationship between surface deformations and structural deformations.Key findings:In the DK277 section,shallow surface subsidence is primarily driven by fluctuations in groundwater levels and exhibits a noticeable correlation with roadbed structural deformations.In the DK372 section,subsidence is predominantly concentrated within an 80-meter range,and ground subsidence has minimal impact on bridge structural deformations due to the effective mitigation measures provided by pile foundations.These research findings can serve as a valuable reference for similar projects.
作者
岳建刚
曹乾贵
杨莹
YUE Jiangang;CAO Qiangui;YANG Ying(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan Hubei 430063,China;Lunan High Speed Railway Co.Ltd.,Jinan Shandong 250014,China)
出处
《铁道建筑技术》
2024年第1期209-213,共5页
Railway Construction Technology
基金
山东省交通运输厅科技计划(2022B89)
中国铁路总公司科技研究开发计划(2017G008-J)。
关键词
采空区
高速铁路
变形监测
自动化监测
协同变形
goaf
high-speed railway
deformation monitoring
automated monitoring
collaborative deformation
