FLAC3D在地基砂土液化判别中的应用

Application of FLAC3D in the Foundation Sand Liquefaction Discrimination

对于饱和砂土液化的判别,目前规范要求以标准贯入试验为主,但标准贯入试验有一定的局限性.有限差分等数值模拟软件可有效、准确地模拟材料的屈服、塑性流动、软化直至大变形过程,为此采用岩土工程数值分析软件FLAC3D,对南水北调中线工程河南段引水干渠渠基进行砂土液化判别,并与标注贯入法的结果进行对比.结果表明:数值模拟结果与标准贯入法判定液化结果一致,FLAC3D能够反映土层的整体液化性状,对地基砂土液化过程可进行时程监测,从而根据不同土层的液化情况,提出针对性的治理措施.

For the discrimination of the saturated sand liquefaction,the current specification is mainly based on standard penetration test,while standard penetration test has some limitations.Some numerical simulation software such as finite difference can effectively and accurately simulate the material yield,plastic flow,softening and large deformation process.Therefore,FLAC3D,a kind of geotechnical engineering numerical analysis software,is applied to the discrimination of sand liquefaction of canal foundation in Trunk Diversion Channels of North Water Transfer Project in Henan Section.The results are compared with those measured by standard penetration test.The comparative analysis shows the numerical simulation can be applied to the soil liquefaction discrimination,and numerical simulation method is very good to overcome the limitation of standard penetration test,and can reflect the overall liquefaction behavior of soil and the ground liquefaction process monitoring.Thus,for different soil liquefaction situation,some targeted control measures can be proposed.