【摘要】 应用FLAC3D作自由场典型液化数值模拟试验、刚性结构对液化场影响试验、液化场浅埋地下结构动力特性试验、弹性场浅埋地下结构动力特征比对试验。试验结果再一次揭示了砂土液化典型特性:体积压缩积累增大,有效应力降低,超静孔隙水压升高。试验证实了液化的隔振作用:砂土在液化状态不能传递剪力,其加速度、速度、位移振幅显著衰减。试验得出:刚性结构有抑制周围土液化的作用。计算结果表明,液化场中浅埋地下结构的加速度反应比弹性场要小,但液化场中结构的应力应变却比弹性场大。在场地基底水平振动荷载作用下,弹性场浅埋地下结构的受力变形特点以剪切型变形为主,液化场浅埋地下结构受力变形特点以对称弯曲型变形为主。更多还原

【Abstract】 The numerical simulation test was completed for the typical liquefaction in free field with FLAC3D,a test on impact of rigid structure on LP field,the test on dynamic characteristics of liquefaction field and shallow underground structures interaction and the dynamic characteristics test for shallow underground structures in elastic field were completed.The results show that the typical characteristics of soil liquefaction are the increase of accumulation of volumetric compression,reduction of effective stress and increase of excess pore water pressure.The results confirmed the isolation effect of liquefaction: the sandy soil in liquid state could not transfer the shear force and its acceleration,velocity and displacement amplitude decreased significantly.Experiment showed that the rigid structure inhibited liquefaction of surrounding soil.The calculation results show that the acceleration response of underground structures in liquefaction field is smaller than that in the elastic fields,but the stress and strain of structure in liquefaction field is larger.With vibrating load on the field bottom base,the deformation feature of shallow underground structure in elastic fields is of shear type,the deformation feature of shallow underground structure in PL fields is of bending type.更多还原