Design and implementation of SHM system for highway tunnels

doi:10.16265/j.cnki.issn1003-3033.2022.07.1444

Abstract

Abstract:

In order to reduce structural damages of mountain highway tunnels during operation, to improve operation management and reduce maintenance costs, a structural health monitoring system for the tunnel was developed by utilizing SHM and automatic monitoring technology. Then, overall system framework, core subsystems and various functions were established by adopting C series programming language, C/S structure and 4-layer architecture system. Finally, experiments were conducted in Chang'an tunnel of Huaiyang expressway to verify applicability and effectiveness of the system. The results show that the proposed system can collect, organize and store monitoring data of various types of sensors in real time, analyze and process data (such as curve analysis, over-limit monitoring and early warning and forecasting, etc.), correlate measurement points with CAD drawings, and comprehensively evaluate tunnel structural health and generate reports automatically.

Key words: mountain highway tunnel, structural health monitoring (SHM), automated monitoring, analytical processing, comprehensive evaluation

XIE Quanmin, MA Wei, YANG Wendong. Design and implementation of SHM system for highway tunnels[J]. China Safety Science Journal, 2022, 32(7): 56-62.

Figures/Tables 8

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监测项目	采集设备	型号	精度	数量
混凝土应变	混凝土应变计	EM-5	±0.5/100	40支
钢筋应力	钢筋应力计	IRHP	±1.0/100	40支
断面收敛	收敛监测仪	CD70A	0.1mm	4套
远程监测单元	数据采集仪	DT85G	—	2套
远程监测单元	扩展模块	CEM20	—	4套

序号	安全等级评价指标	A	B	C	D	E
序号	安全等级评价指标	完好	轻微	较严重	严重	极严重
1	钢筋应力 σ/MPa	<188	188≤σ<215	215≤σ<240	240≤σ<268	≥268
2	混凝土应变 ε/10^-6	<372(压) <33(拉)	372≤ε<426 (压) 33≤ε<38(拉)	426≤ε<479 (压) 38≤ε<43(拉)	479≤ε<532 (压) 43≤ε<48(拉)	≥532 (压) ≥48(拉)
3	断面收敛 v /(mm·d^-1)	<0.15	0.15≤v<0.4	0.4≤v<0.5	0.6≤v<0.7	≥0.7
4	衬砌漏水	0	1(拱部有季节性滴水、边墙有季节性淌水)	2(拱部有滴水、边墙有淌水)	3(拱部滴水星线、边墙淌水流泥)	4(拱部漏水直击接触网,影响正常运营)
5	衬砌裂纹	0	1(有收缩或环向裂纹)	2(裂纹多于3条、有交叉:裂纹长<5 m、宽度<3 mm)	3(网状裂纹、有剥落掉块可能;裂纹长5~10 m,宽3~5 mm)	4(裂纹呈网状、有剥落掉快;裂纹长>10 m、宽>5 mm)
健康等级描述		完好状态。无异常情况。	轻微破损。存在轻微破损,现阶段趋于稳定,对交通安全不会有影响	中等破损。存在破坏,发展缓慢,可能会影响交通安全	严重破损。存在较严重破坏,发展较快,已影响交通安全	危险状态。存在严重破坏,发展迅速,已危及交通安全
养护对策		正常养护	检查结构破损部位,必要时实施保养维修	重点监测结构破损部位,实施保养维修	尽快治理结构破损部位,实施交通管制	及时关闭隧道,及时全面地治理破坏部位

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