基于工程易损性灾变论的高铁路基服役状态评价

High-speed railway subgrade service status assessment based on hazard-affected engineering vulnerability concept

传统铁路路基状态评估的有损检测不宜用于高铁无砟轨道,而以轨检车为代表的无损检测物理意义不明确,难以定性路基病害或预测其变化趋势。鉴于高铁路基易受工后沉降及运营环境等多因素影响,类似于工程承灾模型,故以灾变论为基础,引入工程易损性理念。分别将运营环境与路基自身属性类比为致灾体、承灾体,将常规轨检车动检与工后沉降监测、外部运营环境调查相结合,采用可拓物元分析法为计算模型,提出高铁路基服役状态评价新方法,并依托沪宁城际铁路典型区段展开实例分析。研究结果表明:引入工程易损性理念后,实现了基于统计学意义、工学机理与工程地质环境的高铁路基状态“三位一体”综合评判,有助于反映其瞬时性状、病害成因及发展趋势,较传统方法更为全面合理。该方法可为高铁路基服役状态的提前预判与及时响应,以及铁路部门运营方案调整及养护维修等提供理论支撑。

The previous destructive detection method for railway subgrade status assessment can’t be applied in the current ballast-less track high speed railway.Yet,the nondestructive detection method such as track inspection car is also disadvantaged in randomness and inexplicit physical significance,which hindered the determining of subgrade defects and its changing tendency prediction.In consideration of subgrade suffering from post-construction settlement and various factors in operation environment,the concept of engineering vulnerability was introduced into this study.In order to analyze the outer operation environment and subgrade inner feature,the analogical objects in terms of hazard-caused body and hazard-affected body were adopted respectively,and the routine track inspection car,post construction settlement detection and outer operation environment survey were integrated organically.By taking the extension theory as calculation model,a new method of assessing high-speed railway subgrade service status was proposed.The research was conducted on several trial subgrade sections of Shanghai-Nanjing intercity high-speed railway.The main conclusions are as follows.Through introduction of engineering vulnerability concept,the comprehensive trinity assessments based on statistics,engineering mechanism and geological environment were accomplished.This method would assist to indicate the instantaneous status,defects mechanism and development tendency of high-speed railway subgrade,which can be completer and more legitimate than the previous methods.Moreover,this study can provide theoretical foundation for anticipated prediction and timely response for high-speed railway subgrade service status,as well as the adjustment of operation schemes and maintenance measures.