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国内外历次大地震的震害经验都证明:[1][2][3][4]场地的局部地质条件对震害有着十分明显的影响,其中尤其以土质条件对震害的影响最为显著。在较为松软的土层上的结构其震害总是比在坚硬土层或基岩上为重,震害差异往往可达1至2度。在较高烈度区内,软弱土层有时会发生过大的残余变形、不均匀沉降、地裂缝及饱和砂土地基液化等地基失效现象,从而促使上部结构震害加重。但是震害经验证明,在许多情况下,较软
The earthquake damage experience of all the previous major earthquakes both at home and abroad proves that the local geological conditions of [1] [2] [3] [4] have a very significant impact on the earthquake damage, and the influence of the soil conditions on the earthquake damage is the most significant . Structures on softer soil tend to be more detrimental than those on hard soil or bedrock, and differences in seismicity can often range from 1 to 2 degrees. In the region of higher intensity, the failure of excessive deformation, uneven settlement, liquefaction of ground fissures and liquefaction of saturated sand foundation may sometimes occur in the soft soil layer, which may aggravate the damage to the superstructure. However, experience from earthquake damage has proved softer in many cases