高铁波浪状地形路基间过渡段沉降特性与控制效果

Study on settlement characteristics and control effect of high-speed railway transition section in wavy terrain subgrade

针对深厚软土地区连续路堤路堑过渡段沉降控制，结合模糊层次分析法，采用沉降板、分层沉降管和单点沉降计3种监测技术，开展变形特性与工后沉降控制研究，并对工后沉降影响因素进行探讨。研究结果表明：根据地层特性选择地基处理方式，过渡段纵向差异沉降量较小，保证了线路平顺。各断面横向沉降路肩大于路基中心，铺轨前的横向差异沉降为4～9mm。沉降增长速率在加载期明显变大，间歇期变小，进入恒载期后，沉降曲线逐渐变缓，虽略有回弹，但沉降逐渐趋于稳定。揭示了高速铁路软土路基沉降变形规律，并提出波浪状地形路基间过渡段工后沉降控制措施。研究结果为进一步理论研究和工程设计提供了有益的依据。

In order to control the settlement of continuous embankment and cutting transition section in deep soft soil area, the deformation characteristics and settlement analysis were performed after construction combined with fuzzy analytic hierarchy process and three kinds of monitoring techniques, including single - point settlement in- strument, layered settlement instrument and settlement plate supervision. Meanwhile, the influencing factors were estimated after construction. The results show that ground treatment methods should be selected based on formation characteristics, and there exists small difference for high -speed railway transition section longitudinal deformation, which ensures the smoothness of the roadbed surface. According to the results of settlement testing in three sections, the values in shoulder are greater than that in embankment center, and the difference of lateral settlement is 4 ~ 9 mm before track construction. The increase rate of sedimentation under loading period is sig- nificantly larger and smaller during intermittent period. When being constant loading period, the settlement curve gradually slows although a slight rebound, but the settlement gradually tends to be stable. The solutions reveal the settlement characteristics of high - speed railway in soft subgrade. Based on this, the control measures of set- tlement after construction were proposed in transition section of wavy terrain subgrade. The results provide a use- ful reference for further theoretical studies and future similar projects.