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在软土地基修建高速铁路和客运专线时,对软土地基进行沉降观测,对于保证工程质量和工期具有重要的意义。选取京沪高速铁路济南西站DIK418+298.9断面进行沉降监测,分析堆载预压的填筑高度对复合地基的影响。试验结果表明:在填筑过程中,地基沉降量随预压土填筑高度的增加而增加;在预压过程中,复合地基沉降量先急剧增大,后趋于稳定;卸载预压土后,复合地基的沉降会有一定量的回弹。
When constructing high-speed railway and passenger dedicated line on soft soil foundation, the settlement observation on soft ground is of great significance for ensuring the project quality and construction period. The settlement of DIK418 + 298.9 section of Jinan West Railway Station of Beijing-Shanghai high-speed railway is selected to analyze the influence of filling height of prestressed pile on composite foundation. The results show that during the filling process, the settlement of foundation increases with the filling height of preloading soil. In the process of preloading, the settlement of composite foundation firstly increases sharply and then tends to be stable. After unloading of preloading soil , The settlement of composite foundation will have a certain amount of rebound.