地震液化对桥梁桩基础极限承载力的影响

地震后砂土液化是地震的主要震害之一．对砂土液化前后桥梁桩基的极限承载力进行了数值计算，结果表明砂土液化后，基桩的横向极限承载力明显降低，其降低程度与桩周可液化土体的厚度及液化程度相关．桩周可液化土体厚度越大，液化程度越高，则地基土的水平抗力系数m降低越多，桩基的横向极限承载力降低也越多．同时，砂土的液化导致基桩的水平位移在同等载荷作用下也有较大的增长．

Research on the Transverse Limit Bearing Weight of the Pile Foundation of the Bridges Aroused by the Earthquake Liquefying

The soil liquefying is one of the main disasters of the earthquake. This paper calculated the limit bearing weight of the pile of foundation of the bridges pre-and-after the earthquake liquefied. The result shows that after the soil liquefied, the transverse limit bearing weight of the pile foundation would reduce obviously, and the decrease is correlated with the liquefying soil depth around with the pile foundation. The depth of the soil around the pile foundation is deeper, and the degree of the soil liquefied is more highly, then the level strength modulus m of the ground soil would reduce more, the transverse limit bearing weight of the pile foundation would also reduce more. At the same time, the level displacement under the same load would increase greatly.