基于摄动理论盾构隧道壁后脱空识别分析研究

发布时间：2018-12-22 08:30

【摘要】：隧道工程中的壁后脱空病害具有极强的隐蔽性和不确定性,针对盾构隧道中脱空损伤问题,研究了盾构隧道在脱空损伤下其动态特征的变化规律。采用摄动理论分析,建立表征脱空损伤系数η,并结合δ函数的性质,推导了脱空损伤下盾构隧道的模态特征解析式,并引入模态应变能损伤指数进行损伤定位。最后以上海地铁某盾构隧道为例,对无脱空损伤、脱空损伤条件下进行摄动理论分析及有限元分析,结果表明:无论采用摄动理论分析还是有限元分析都能较好地对脱空损伤进行动态演化分析,同时模态应变能损伤指数也能够较好地对脱空位置进行定位,可为基于动力特性的隧道脱空损伤识别和动态监测提供理论依据。
[Abstract]:There is a strong concealment and uncertainty in the disease of back-wall emptying in tunnel engineering. Aiming at the problem of emptying damage in shield tunnel, the variation law of dynamic characteristics of shield tunnel under emptying damage is studied. By using perturbation theory analysis, the characterization of void damage coefficient 畏 is established. Combining with the properties of 未 function, the analytical formula of modal characteristics of shield tunnel under emptying damage is derived, and the damage location is carried out by introducing the damage index of modal strain energy. Finally, taking a shield tunnel of Shanghai Metro as an example, the perturbation theory analysis and finite element analysis are carried out under the condition of no emptying damage and emptying damage. The results show that both perturbation theory analysis and finite element analysis can be used to analyze the dynamic evolution of the void damage, and the modal strain energy damage index can also be used to locate the void location. It can provide a theoretical basis for tunnel void damage identification and dynamic monitoring based on dynamic characteristics.
【作者单位】：同济大学岩土及地下工程教育部重点实验室;同济大学土木学院地下系;
【基金】：国家重点基础研究发展(973)计划资助(2011CB013803) 上海市科学技术委员会计划资助(10231201500、112312000900) 长江学者和创新团队发展计划资助(IRT1029)
【分类号】：U455.43

【相似文献】