地震时,地基不良会导致上部结构的破坏。例如,在软弱粘土、饱和粉细砂地基上,在半挖半填或局部填土坑上,在埋藏的古河道上,在陡坡、高台、深填土坑边缘上建筑房屋或建筑物部分墙基为挡土墙时,往往导致上部结构较重的破坏。国内外均有因砂土液化地基失稳造成房屋倾斜或倾倒的情况。 In earthquakes, poor foundations can cause damage to the superstructure. For example, on soft clay and saturated fine sand foundations, in semi-embedded or partially filled pits, on buried ancient rivers, on the edge of steep slopes, high platforms, deep filling pits, or on the part of buildings. When retaining walls, they often cause heavier damage to the superstructure. At home and abroad, there are cases where the house is tilted or dumped due to the instability of the sand liquefaction foundation.