CFG桩联合泡沫混凝土处理桥头跳车问题研究

Treatment for Vehicle Bumps at Bridgehead with CFG Pile-Foamed Concrete

主要研究了软土地基中的桥头跳车问题,结合天然地基和CFG桩复合地基以及CFG桩联合泡沫混凝土地基的数值模拟分析,得出了3种工况下路基的沉降变化规律,同时明确了CFG桩联合泡沫混凝土处理桥头跳车问题的有效性。天然地基工况下的最大工后沉降为22.5 cm,不符合规范要求,CFG复合地基的最大工后沉降为6.2 cm;天然地基工况的沉降最大值位于路基顶面,CFG桩复合地基工况位于地基与路基的交界面。采用泡沫混凝土进行台后15 m范围内的换填后,减小了台后的差异性沉降,15年后最大工后沉降为3.61 cm,有利于治理桥头跳车问题。

This paper mainly investigated the vehicle bumps at the bridgehead in the soft soil foundation.According to the numerical simulation analysis of the natural foundation,CFG pile composite foundation,and CFG pile-foamed concrete foundation,the subgrade settlement change laws under these three working conditions were obtained and the effectiveness of using the CFG pile-foamed concrete to treat the vehicle bumps at the bridgehead was clarified.The maximum post-construction settlement under the natural foundation was 22.5 cm,which did not meet the specification requirement.The maximum post-construction settlement of the CFG pile composite foundation was 6.2 cm.The maximum settlement of the natural foundation was located at the top of the subgrade,and that of the CFG pile composite foundation was located at the interface between the foundation and the subgrade.After filling the foamed concrete within 15 m behind the abutment,the differential settlement behind the abutment was reduced,and the maximum post-construction settlement after 15 years was 3.61 cm,which was conducive to the treatment for vehicle bumps at the bridgehead.