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高烈度地震区的粉(砂)土地基抗剪能力和承载能力均较差,易出现地基土液化的现象,会对桥梁桩基础的沉降和承载力产生不利影响,有可能影响到桥梁上部结构以及桥上行车的安全。该文基于铁路桥梁基础设计的相关规范,对高烈度地震区粉(砂)土地基液化对高速铁路桥梁桩基沉降及承载力的影响进行研究。结果表明:高烈度地震区粉(砂)土地基液化对高速铁路桥梁桩基沉降及承载力的影响非常明显,在设计中必须予以考虑,通过增加桩长以减少桩基沉降并提高桩基承载力。
In the high seismicity area, the ground foundation of silt (sand) is poor in shear capacity and bearing capacity, prone to liquefaction of the foundation soil, which will adversely affect the settlement and bearing capacity of the bridge pile foundation and may affect the structure of the bridge superstructure And the safety of driving on the bridge. Based on the relevant norms of railway bridge foundation design, the paper studies the influence of liquefaction of silt ground on settlement and bearing capacity of high speed railway bridge pile foundation in high seismicity area. The results show that the liquefaction of silt foundation in high seismicity area has obvious influence on the settlement and bearing capacity of pile foundation in high-speed railway bridges. It must be considered in the design. By increasing the pile length, the settlement of pile foundation can be reduced and the pile foundation load can be increased force.