改扩建路基差异沉降特性研究

Research on Differential Settlement Characteristics of the Reconstructed and Expanded Subgrade

文章结合具体工程实例,以某省道改扩建工程为研究对象,采用ANSYS有限元分析软件对拓宽后的路基沉降变化情况进行模拟分析,分别研究了新旧路基衔接方式、台阶尺寸、填料特性等影响因素对新旧路基不均匀沉降的影响。研究结果表明:当开挖台阶时,降低台阶高度、增大台阶宽度可以降低路基沉降;轻质、高弹性模量的填料对改扩建后的路基沉降有显著改善作用。

Combined with specific engineering examples,taking a provincial highway reconstruction and expansion engineering as the research object,the ANSYS finite element analysis software is used to simulate and analyze the settlement changes of the widened subgrade.The influence of the factors such as the connection mode,step size and filler characteristics of the new and old subgrade on the uneven settlement of the new and old subgrade is studied respectively.The results show that when excavating steps,reducing the step height and increasing the step width can reduce the settlement of subgrade.The lightweight and high elastic modulus filler has a significant improvement effect on the subgrade settlement after reconstruction and expansion.