隧道结构健康监测系统理念及其技术应用

研究目的:近年来,随着传感器技术、信息采集技术及测试分析技术的迅猛发展,基于各种监测手段的实时、连续性的结构健康监测系统在土木工程领域中竞相展开,并在诸如桥梁、水利等工程领域得到广泛应用.地下工程领域中,由于围岩-结构自身的复杂性,结构受力状态的不确定性,一直以来对于隧道结构健康监测的研究鲜有问津.研究结论:通过本文研究,得出了以下几点结论:(1)一个完整的TSHMS系统应由数据采集与传输系统、数据分析与处理系统、隧道结构健康评价及预警系统组成；(2)通过对隧道结构力学演变特征的分析,提出了TSHMS系统中应对二次衬砌的受力特征进行长期重点监控的基本思路；(3)结合隧道工程复杂性及其安全评价“模糊性”的具体特点,在现有常规安全评价体系的基础上引入了模糊综合评判的评价手段；(4)将上述理念应用于苍岭特长公路隧道中,初步建立了一套TSHMS系统,评价结果与实际基本一致,验证了其可靠性.

Ideas of Tunnel Structure Health Monitoring System and Its Technology Application

Research purposes: In recently years,the various structure health monitoring systems have been used in the civil engineering projects and the engineering projects,such as bridge engineering and hydraulic engineering with the rapid developments of sensor technology,data collection technology and test analysis technology.However,there is a little study on monitoring the health of the tunnel structure because of complexity and uncertainty of surrounding rock structure and the load bearing situation. Research conclusions:From the study,the following conclusions can be obtained:(1) The complete tunnel structural health monitoring system(TSHMS) should be composed of the data collection & transmission system,data analysis & processing system and structural safety evaluation & alarm system.(2) Through the analysis of mechanical evolution characteristics of the tunnel structure,the basic idea is presented that the long-term monitoring of the stress characteristics of the secondary lining should be especially conducted.(3) According to the complexity and indeterminacy characteristics of tunnel engineering,the fuzzy comprehensive evaluation means is introduced on the base of the conventional safety evaluation system.(4) With application of the concepts mentioned above in the super-long tunnel engineering of the Cangling highway,a preliminary TSHMS is established and the evaluation results are basically consistent with the actual situation,so this system is reliable.